By F. Walker.
[Continued from vol. iii. p. 265.]
Order HYMENOPTERA.
Fam. Formicidae .
Formica exercita .
Faem. Nigra, densissime et scitissime punctata, antennis subfiliformibus, scapo flagelloque apice rufescentibus,
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Mr. F. Walker on some undescribed Ceylon Insects. 371
clypeo subcarinata incisuris duabus anticis, coxis femoribusque rufis, his apice nigris, alia fuscis, venis nigricantibus, stigmate nigro. Mas. Gracilis, antennis apice rufis, pedibus piceis.
Female. Black, very thickly and finely punctured. Antennae subfiliform; tips of the scape and of the flagellum reddish. Clypeus slightly keeled, with a notch on each side in front. Legs moderately stout; coxae and femora red, the latter with black tips, Wings brown; veins blackish, in structure much like those of Polyrhachis militaris ; stigma black. Length of the body 4 lines; of the wings 8 lines. Male. More slender. Antennae slender, red towards the tips. Legs slender, piccous. Length of the body 3 - 1 / 2 lines; of the wings 7 lines.
Formica exundans .
Mas. Nigra, elongata, scitissime punctata, antennis piceis filiformibus corpore vix brevioribus, abdomine longi-fusiformi, segmentorum marginibus pedibusque pallide piceis, alis cinereis, venis nigricantibus, stigmate nigro.
Male. Black, elongate, very finely punctured. Antennae piceous, filiform, nearly as long as the body. Abdomen elongate fusiform; hind borders of the segments and legs pale piceous; scale of the peduncle large. Wings cinereous; veins much like those of the preceding species; stigma black. Length of the body 4 lines of the wings 6 lines.
Formica meritans .
Mas. Nigra, elongata, nitens, pubescens capite impresso, ore fulvo, antennis piceis filiformibus corpore paullo brevioribus, metathorace elongato transverse impresso, Seg-mentorum abdominalium marginibus posticis rufis, pedibus piceis longiusculis, alis nigro-fuscis, venis stigmateque nigris.
Male. Black, elongate, shining, pubescent. Head with an impression between the ocelli and the base of the antennae. Mouth tawny. Antennae piceous, filiform, a little shorter than the body. Metathorax elongate, slightly impressed across the middle. Peduncle of the abdomen conical. Hind borders of the abdominal segments red. Legs piceous, rather long. Wings blackish brown; veins and stigma black, the former like those of F. exercita in structure. Length of the body 5 lines, of the wings 6 lines.
Formica latebrosa .
Mas. Testacea, antennis gracillimis, scapo longissimo, metathorace laevi, abdomine nigro, petiolo testaceo, pedibus longis debilibus, alis albis, venis stigmateque testaceis.
Male. Testaceous. Antennae very slender; scape very long, slightly increasing in thickness from the base to the tip, much more than half the length of the flagellum. Metathorax smooth. Abdomen black; peduncle and its node testaceous. Legs long,. slender. Wings white; veins and stigma testaceous, the former in structure like those of F. exercita . Length of the body 4 lines; of the wings 7 lines.
Formica pangens .
Mas. Testacea, scitissime punctata, capito supra picco, antennis filiformibus corpore valde brevioribus, scapo
24 *
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372 Mr. F. Walker on some mdescribed Ceylon Insects.
brevissimo, abdomine elliptico, antice piceo, pedibus breviusculis, alis cincreis, venis testaceis, stigmate nigro.
Male. Testaceous, slightly shining, very finely and minutely punctured. Head piceous above. Antennae filiform, much shorter than the body; scape very short. Abdomen elliptical, very little longer than the thorax; fore-half piceous. Legs rather short. Wings cinereous; veins testaceous, in structure like those of Tapinoma erratica ; stigma black. Length of the body 2 1 / 2 lines; of the wings 4 lines.
Formica ingruens .
Faem. Nigra, scitissime punctata, capite mag-no, mandibulis tarsisque testaceis, antennis corporis dimidio non longioribus, scapo longo subclavato, flagello rufescente subclavato, abdomine lato brevi-elliptico, pedibus robustis breviusculis, alis cinercis parvis, venis piceis, stigmate nigro.
Female. Black, shining, very finely punctured. Head large; mandibles testaceous. Antennae about half the length of the body; scape subclavato, much more than half the length of the flagellum; the latter reddish, subclavata Abdomen short-elliptical, very much broader than the thorax. Legs short, stout; tarsi testaceous. Wings cinereous, narrow, short; veins piceous, in structure like those of F. pangens ; stigma black. Length of the body 2 1 / 2 lines, of the wings 4 lines.
Formica detorquens .
Faem. Nigra, scitissime punctata, capite parvo, antennis subfiliformibus corporis dimidio paullo longioribus, scapo longo, abdomine elliptico, pedibus breviusculis, tarsis testaceis, alis pallide cinercis, venis stigmateque testaceis.
Female. Black, shining, very finely punctured. Head small, a little more than half the length of the body. Antennae nearly filiform; scape much more than half the length of the flagellum. Abdomen elliptical, hardly longer - or brooder than the thorax. Legs short; tarsi testaceous. Wings pale cinereous; veins and stigma testaceous; the former in structure much like those of Tapinoma erratica , but the discal areolet is open on the exterior side. Length of the body 13 / 4 line; of the wings 3 Hues.
Formica diffidens .
Faem. Fulva, gracilis, aptera, capite nigro elongato, mandibulis magnis fulvis, antennis fulvis subfiliformibus, metathorace petioloque longis. abdomine nigro elliptico, pedibus posticis piceis, tarsis posticis testaceis.
Female. Tawny, slender, apterous. Head black, elongate. Mandibles large, tawny. Antennae tawny, nearly filiform; scape moderately long. Metathorax and peduncle long. Abdomen black, elliptical, shorter than the thorax. Hind legs piceous; hind tarsi testaceous, long, slender. Length of the body 2 lines. The description is taken from an injured specimen.
Formica obscurans .
Faem. Nigra, sat gracilis, scitissime punctata, capito longi-quadrato, mandibulis magnis fulvis, antennis corporis dimidio vix brevioribus, scapo longo subclavato, flagello fulvo sub-
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Mr. F. Walker on some mdescribed Ceylon Insects. 373
clavato, mesothorace sublineato, abdomine latiusculo, pedibus pi-ceis, alis albidis, venis stigmateque testaceis.
Female. Black, rather slender, slightly shining, very finely punctured. Head elongate-quadrate; mandibles large, tawny. Antennae; nearly half the length of the body; scape subclavate, about two-thirds of the length of the flagellum; the latter tawny, subclavate. Prothorax and metathorax well developed; mesothorax with a slight middle line. Abdomen broader than the thorax. Legs piceous. Wings whitish; veins and stigma testaceous; the former in structure like those of Tapinoma erratica . Length of the body 4 lines; of the wings 6 lines.
Formica indeflexa .
Faem. Picea, gracilis, aptera, scitissime punctata, capite sat magno, mandibulis parvis, antennis subfilifor-mibus corporis dimidio non longioribus, flagello basi scapoque testaceis, thorace subcompresso, pedibus fulvis, tibiis nigris basi fulvis, tarsis testaceis.
Female. Piceous, slender, apterous, very finely punctured. Head rather large; mandibles small. Antennae slender, not more than half the length of the body, nearly filiform; scape tawny, much shorter than the flagellum, the latter tawny towards the base. Thorax somewhat compressed; metathorax, peduncle and its node well developed. Abdomen mutilated. Legs tawny; tibiae black, tawny at the base; tarsi testaceous. Length of the body 4 lines.
Formica consultans .
Mas. Nigra, elongata, scitissime punctata, capito parvo antice fulvo, mandibulis minimis, antennis piceis fili-formibus corpore valde brevioribus, scapo brevissimo, abdomine rufescente elliptico fascia media nigra, pedibus testaceis, alis cinereis, latiusculis, venis testaceis, stigmate piceo.
Male. Black, elongate, slightly shining, very finely punctured. Head rather small, tawny in front; mandibles very small. Antennae; piceous, slender, filiform, much shorter than the body; scape very short. Abdomen reddish, elliptical, a little broader than the thorax, with a black middle band. Legs testaceous, slender. Wings cinereous, rather broad; veins testaceous, in structure much like those of Formica exercita ; stigma piceous. Length of the body 3 lines; of the wings 5 lines.
Polyrhachis illaudatus .
Mas. Niger, subaurato-tomentosus, clypeo subsulcato lateribus elevatis, antennis filiformibus corpore paullo brevioribus, scuto bispinoso, scutello emarginato, meta-thorace lateribus elevatis incisis postice bispinoso, abdomine lato brevissime elliptico, pedibus robustis.
Male. Black, apterous, with slightly gilded tomentum. Clypeus with a very slight middle furrow, and with a ridge along each side. Antennae filiform, a little shorter than the body; scape very long, but shorter than the flagellum. Scutum with two long sharp spines, which are directed obliquely forward; scutellum shield-shaped, truncated at the tip, emarginate on each side. Metathorax with a notched ridge on each side. Peduncle
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374 Mr. F. Walker on some undescribed Ceylon Insects.
thick, widening hindward; two posterior spines, which are directed hindward. Abdomen very short, elliptical, much broader than the thorax. Legs robust. Length of the body 4 1 / 2 lines.
Myrmica consternens .
Mas. Testacea, gracilis, nitens, capite parvo supra nigro, antennis filiformibus thorace non longioribus, abdomine subfusiformi, pedibus parvis, alis albidis, venis stigmate-que testaceis. Neut.? Nigra, capite magno elongato, antennis testaceis subclavatis, thorace testaceo compresso, abdomine brevi-ovato, pedibus testaceis.
Male. Testaceous, slender, shining. Head small, vertex black. Antennae filiform, paler than the body, not longer than the thorax. Peduncle with two small nodes. Abdomen nearly fusiform, a little longer than the thorax. Legs short, slender. Wings whitish; veins and stigma testaceous, the former in structure much like those of Polyrhachis militaris . Length of the body 2 1 / 2 lines; of the wings 5 lines.
Worker? Black. Head large, elongate. Antennae short, testaceous, subclavate. Thorax testaceous, compressed, narrower than the head, attenuated and partly black hindward. Abdomen short-oval, broader than the head. Legs testaceous; femora mostly piceous. Length of the body 3 / 4 line.
Crematogaster pellens .
Faem. Fulvus, gracilis, pubescens, capite subrotundo, mandibulis latis trigonis, antennis testaceis clavatis, metathorace bidentato, abdomine longi-elliptico, pedibus testaceis breviusculis, alis albidis amplis, venis stigmateque testaceis.
Female. Tawny, shining, minutely pubescent. Head nearly round; mandibles short, broad, triangular. Antennae testaceous, clavate, shorter than the thorax. Metathorax with two short stout spines. First node of the peduncle much longer than the second. Abdomen long-elliptical, very convex beneath, longer and broader than the thorax. Legs short, testaceous; femora, sometimes darker. Wings whitish, ample; veins and stigma testaceous, the former in structure like those of Crematogaster castaneus . Length of the body 4 lines; of the wings 8 lines.
Crematogaster deponens .
Faem. Niger, nitens, punctatus, capite elongato subsulcato, mandibulis piceis latis trigonis, antennis breviusculis rufescentibus subclavatis, thorace fusiformi subcompresso, metathorace bidenticulato, petioli nodis conicis, abdomine rufo fusiformi, pedibus rufis breviusculis, alis fuscescentibus, venis stigmateque nigris.
Female. Black, shining, punctured. Head elongate, with a slight longitudinal furrow; mandibles piceous, short, broad, triangular, with minute teeth. Antennae short, reddish, subclavate. Thorax fusiform, slightly compressed; metathorax with two minute teeth. Peduncle with two conical nodes. Abdomen red, fusiform, longer and broader than the thorax. Legs red, short. Wings brownish; veins and stigma black, the former very strongly marked, extending to the border, in structure somewhat like those
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Mr. F. Walker on some undescribed Ceylon Insects. 375
of Formica rufa and of Crematogaster castaneus , but differing slightly from both. Length of the body 31 / 2 lines; of the wings 6 lines.
Crematogaster forticulus .
Neut. Niger, sat angustus, scitis-sime punctatus, capite subquadrate, mandibulis parvis piceis, an-tennis subclavatis thorace non lotigioribus, abdomine longi-ellip-tico latiusculo, pedibus breviusculis, tarsis pallide testaceis.
Worker. Black, rather narrow, slightly shining, very finely punctured. Head subquadrate, a little broader than the thorax; mandibles small, piccous. Antennae subclavate, as long as the thorax. Abdomen long-elliptical, longer and broader than the thorax. Legs rather short; tarsi pale testaceous. Length of the body 1 3 / 4 line.
Pseudomyrma? allaborans .
Mas. Nigra, gracilis, brevis, nitens, capite antice fulvo, antennis subclavatis pallide luteis, petioli nodis magnis globosis, abdomine fusiformi suturis pallidis, pedibus fulvis breviusculis robustis, alis albidis, venis stigmateque nigris. Faem. Antennis clavatis, femoribus posticis nigris. Neut. Capite lato, thoracis segmentis bene determinatis; abdomine longi-ellip-tico.
Male. Black, slender, smooth, shining. Head tawny in front. Antennae pale luteous, subclavate. Peduncle with large globose nodes. Abdomen fusiform, longer than the thorax; sutures pale. Legs tawny, short, stout. Wings whitish; veins and stigma black. Length of the body 2 lines; of the wings 3 lines. Female. Antennae clavate. Hind femora black. Length of the body 3 1 / 2 lines. Worker. Head broader than the thorax. Segments of the thorax much developed. Abdomen long-elliptical, not longer than the thorax. Length of the body 3 lines.
Atta didita .
Neut. Picea, pubescens, scitissime scabrosa, capite maximo quadrata scite striato bituberculata, scuta gibbosulo, scu-tello minimo, metathorace valde declivi, petioli nodo 2 ° globoso lato, abdomine brevi-elliptico, pedibus fulvis.
Worker major. Piceous, pubescent, very finely scabrous. Head quadrate, very large, twice the breadth of the thorax, finely striated longitudinally, with two protuberances above. Antennae reddish, subclavate. Scutum somewhat gibbous; scutellum very small. Metathorax very slanting. First node of the peduncle rather narrow, minutely quadridentate; second globose, much broader. Abdomen short-elliptical. Legs tawny. Length of the body 3 lines.
Worker minor?. Head much smaller. Thorax less developed. Second node of the peduncle narrower. Abdomen black, round. Legs short, stout. Length of the body 2 lines.
This is probably a distinct species.
Meranoplus dimicans .
Neut. Rufescens, convexus, brevis, latus, scabrosus, pilosus, capite subquadrate, antennis clavatis, scutello bi-
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376 Bibliographical Notice.
spinoso, metathorace bispinuloso, abdomine latiore nigro brevi-clliptico, pedibus breviusculis.
Worker. Reddish, convex, short, broad, scabrous, pilose. Head subquadrate, a little broader than the thorax. Antennae clavate. Scutellum with two long acute spines, which are directed obliquely hindward. Metathorax with two small spines. Abdomen black, short-elliptical, broader than the thorax. Legs short. Length of the body 2 lines.
Fam. Mutillidae .
TiphiA decrescens.
Faem. Nigra, nitens, scitissime punctata, antennis subtus rufis, prothoracis margine postico rufescente, abdomine fusiformi subtus apice rufescente, pedibus rufis, coxis femoribusque nigris, his apice rufis, alis cinereis, venis stigmateque nigris.
Female. Black, shining, very finely punctured. Head a little broader than the thorax; clypeus somewhat truncated, with a transverse furrow at its base. Antennae red beneath. Hind border of the prothorax reddish. Metathorax with two striae, which converge hindward. Abdomen fusiform, reddish beneath at the tip. Legs red, short, thick; coxae and femora black, the latter with red tips. Wings cinereous; veins and stigma black; third submarginal areolet extending almost as far as the marginal areolet, about half the length of the third discoidal areolet. Length of the body 3 lines; of the wings 5 lines. [To be continued.]