POLYRHACHIS. 391 



on the sides finely and delicately punctured ; the apices oE the 

 thoracic and pedicel spines, and the legs and abdomen smooth and 

 hi<:;hly polished ; pubescence and hairs entirely wantiniij. Pronotal 

 spines shorter than the metanotal spines, pointing forward, 

 outward and curved slightly do\\iiward ; metanotal spines stout, 

 erect, their apical half curved outwai'd and downward, resembling 

 chamois horns. Node of pedicel biconvex, with two moderately 

 long spines rising from the lateral angles above and poinring 

 backward, curved to the shape of the abdomen. 



Lenr/tJi, g 8-9 mm. 



Hnb. Upper Burma, the Kuby Mines (Bingham), and Shan 

 States, at 4U00 feet {'Fliompson) ; Tenasserim, Karen Hills north 

 of Papun at 5000 feet (Bingham) ; Java. Nests in the joints of 

 bamboos. 



4fiO. Polyrliachis tuber iceps, Forel, Jour. Bomb. N. H. Soc. viii 

 (1893), pp. •2(j & ;53. 5 . 



5 . Closely resembles P. simplex. Map*, but can be readily 

 distinguished by the shape of the head. Dull black, head, 

 thorax and node of the pedicel somewhat coarsely and closely 

 punctured ; antennte, legs and abdomen opaque, finely granulate ; 

 the extreme apex of the thoracic and ped'cel 

 spines smooth and shining, pubescence entirely 

 wanting. Head broadly oval, rounded pos- 

 teriorly, the tubercle behind the eyes on each 

 side very distinct ; clypeus convex, broadly but 

 not very distinctly longitudinall}'' carinate, its 

 anterior margin nearly transverse, with two 

 minute median projections ; thorax slightly 

 depressed ; pronotal spines short, pointing 

 -p.^ .^f forward and outward ; metanotal spines erect, 



Pob/hachis slightly curved outward at their extreme 



tnbcriceps,^ . points; legs stout, tibise without hairs or 

 spines. Node of pedicel thick, with a mode- 

 rately long, stout spine at its lateral angles, curved backwards and 

 embracing the abdomen, and with two vertical acute short teeth 

 between them ; abdomen only slightly convex above. 

 Length, ^ 7-8 mm. 



Hah. Bengal, Barrackpoi-e ; North-A\^est Provinces (Rothnei/). 

 But for the tuberculute head this species is almost identical 

 with some of the larger varieties of P. simplex, Mayr. 



461. Polyrhachis thompsoni. sp. nov. 



Black, opaque ; head and thorax moderately coarsely, abdomen 

 very finely rugulosely granulate ; pilosity and pubescence entirely 

 wanting, with the exception of a very few erect yellowish hairs at 

 the apex of the abdomen. Head nearly oval, a little broader 

 posteriori V than in front ; clypeus convex, its anterior margin 

 slightly advanced in the middle, with the apex medially sub- 



