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 3f lines ; of the wings 

 6 lines. 



Crematogaster forticulvs. Neut, Niger, sat angustus, scitis- 

 sime punctatus, capite subquadrato, mandibulis parvis piceis, an- 

 tennis subclavatis thorace non longioribus, 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, piceous. 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|- 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. 

 Fcem. 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. 

 Antennas 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. Fe- 

 male. Antennae clavate. Hind femora black. Length of the 

 body 3^ lines. Worker. Head broader than the thorax. Seg- 

 ments of the thorax much developed. Abdomen long-elliptical, 

 not longer than the thorax. Length of the body 3 lines. 



Atta didita. Kent. Picea, pubescens, scitissime scabrosa, capite 

 maximo quadrato scite striato bituberculato, scuto 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 1. 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 dimicaxs. Neut. Rufescens, convexus, brevis, latus, 

 scabrosus, pilosus, capite subquadrato, antennis clavatis, scutello bi- 



