HYMENOPTERA. 63 



so. The prothorax with a short acute spine at the lateral angles, 

 the metathorax truncate, the truncation smooth and shining; 

 the legs elongate, with acute spines or hairs, the calcaria pale 

 testaceous ; the anterior tibiae obscurely ferruginous in front. 

 Abdomen ovate, smooth and shining ; the scale of the peduncle 

 incrassate, narrowed to its superior margin, which is wide, arched, 

 and without spines. 



Hab. Malacca. (Coll. W. W. Saunders, Esq.) 



19. POLYRHACHIS AFFINIS. B.M. 



Worker. Length 2J lines. Black : clothed with pale golden 

 pubescence. Thorax : a very stout acute spine at each angle of 

 the anterior margin of the thorax ; the mesothorax convex above, 

 the sides swollen ; the metathorax with two divergent stout acute 

 spines ; the scale of the abdomen quadrate, with two long, rather 

 slender spines above, which curve backwards over the abdomen ; 

 the legs without spines or pubescence, the calcaria pale testa- 

 ceous. 



Hab. Burmah. 



This species is very like P. dives from Singapore, but differs 

 principally in the form of the mesothorax. 



20. POLYRHACHIS ABDOMINALIS. B.M. 



Worker. Length 3\ lines. Head, thorax and legs black; 

 abdomen ferruginous. Head and thorax opake, very delicately 

 shagreened, the sides of the thorax and the legs with a slight 

 rusty-red appearance; the anterior margin of the clypeus 

 rounded ; the eyes pale reddish-brown. Thorax armed in front 

 with two long straight spines, directed obliquely forwards ; the 

 pro- and metathorax slightly convex, not margined laterally 

 above ; the metathorax with the lateral margins raised, longitu- 

 dinally concave above, and terminating on each side in a long, 

 straight, slightly divergent spine, the spines obscurely ferruginous 

 at the apex. Abdomen subglobose, the scale of the peduncle 

 incrassate, and with two long acute curved spines above. 



Hab. Burmah. 



21. POLYRHACHIS TIBIALIS. B.M. 

 Worker. Length 2| lines. Black : covered with a fine short 



slightly golden pubescent pile, the tibiae and flagellum ferrugi- 

 nous. Head : the basal joints of the flagellum fusco-ferruginous. 

 Thorax : a short stout spine at each of the anterior angles, and a 

 much longer one at the posterior angles ; the thorax is convex 



