154 FORMICIIXI:. 



Key to the Species. 

 2 ?. 



a. Length over 5 mm. Colour more or less 



brown. 

 a ' . Clypeus not carinate. 



2 . Anterior border of clypeus emarginate 



in the middle O. raja, p. 154. 



i 2 . Anterior border of clypeus not emar- 

 ginate O. leei, p. 155. 



b'. Clvpeus feebly but distinctly bicarinate. . O. bengalensis, p. 154. 



b. Length under 5 mm. Colour more or less 



yellow ... 



a'.' Second node of pedicel transverse, much 



broader than long O. asimis, p. 156. 



b'. Second node of pedicel not broader than 



long O. rotkneyi, p. 1 56. 



179. Oligomyrmex raja, Forel, Rev. Suisse Zool x (1902), p. 216, $ . 



$ . Very dark brown, almost black, the mandibles, antennae, 

 legs and abdomen chestnut; head, thorax and abdomen shining, 

 the head very finely and superficially longitudinally striate, 

 posteriorly punctured, thorax and abdomen smooth ; nodes of tbe 

 pedicel rugulose, opaque ; pilosity sparse and scattered. Head 

 without mandibles nearly rectangular, the sides convex, posteriorly 

 truncate ; mandibles somewhat large, finely but rather obscurely 

 longitudinally striate, armed with 6 or 7 teeth ; clypeus not 

 carinate, deeply emarginate in the middle anteriorly; antennae 

 short, the club of the flagellum rather slender, joints 3-5 as 

 broad as long, scape very short ; eyes large, placed about the 

 middle of the sides of the head ; ocelli not very prominent. Thorax 

 moderately long, the mesonotum broad ; metanotum convex, sub- 

 vertical, without any distinct basal portion. Pedicel: the 1st 

 node petiolate anteriorly, transverse, rounded above, much broader 

 than long ; 2nd node a little longer than the 1st and a little 

 broader than long ; abdomen massive, rounded at apex. Wings 

 flavo-hyaline. 



Length, 5-5*5 mm. 



Jfab. Recorded from the North Western Provinces, India 

 (Smyihies) and from Bhamo, Upper Burma (Binyham). Only 

 the $ is known. 



180. Oligomyrmex bengalensis, Forel, Rev. Suisse Zool. x (1902), 



p. 217. 



" $ . Mandibles smooth and shining, a little punctured, armed 

 with 6 teeth. Head shortly rectangular, barely longer than broad, 

 feebly emarginate posteriorly, without a carina behind the ocelli, 

 but feebly subtruncate at the occiput and anteriorly on the^ 

 clypeus, the posterior portion of the latter with a groove down* 

 the middle forms an obtuse angle with the anterior subtruncate 

 portion. This latter is feebly bicarinate, impressed in the middle, 



