64 HYMENOPTERA. 



above. The scale of the peduncle incrassate, quadrate, and with 

 a long acute spine curving backwards and outwardly over the 

 abdomen on each side. Abdomen globose, and having a much 

 finer and brighter pile than the head and thorax. 



Hab. Burmah. 



Very like P. dives ; the thorax is however shorter, broader, 

 and much more convex above ; the spines on the metathorax are 

 also much longer. 



22. POLYRHACHIS MUTATUS. PL IV. figS. 12, 13. B.M. 



Worker. Length 3^ lines. Opake-black : abdomen ferrugi- 

 nous ; the thorax armed with two long, stout, acute spines in 

 front ; the metathorax with two long straight spines directed 

 backwards ; the sides of the metathorax flattened, above, slightly 

 concave or channeled ; the peduncle armed with two long curved 

 spines; the insect entirely destitute of hair; the legs without 

 spines and dark rufo-piceous. 



Hab. Burmah. 



23. POLYRHACHIS L^VISSIMUS. PL IV. fig. 42. B.M. 



Worker. Length 2^ lines. Black, smooth and shining, with 

 the coxae, femora and tibiae ferruginous. Head large, wider than 

 the thorax, the latter widest in front, gradually narrowed to the 

 apex of the metathorax ; the anterior margin of the thorax 

 rounded, the lateral angles acute, the disk very convex, the me- 

 tathorax oblique. The scale of the peduncle incrassate, sub- 

 quadrate, the superior margin notched in the middle, the lateral 

 angles produced and acute. Abdomen globose. 



Hab. Burmah. 



24. POLYRHACHIS FURCATUS. PL IV. fig. 20. B.M. 



Worker. Length 2J lines. Head and thorax black ; abdomen 

 and legs rufo-testaceous. Head smooth, shining and impunctate ; 

 the anterior margin of the clypeus rounded ; the mandibles tri- 

 angular, their inner margin denticulate ; antennae with the scape 

 black, the flagellum rufo-testaceous, the basal joints fuscous. 

 Thorax coarsely rugose, armed on each side anteriorly with a 

 long, stout, slightly curved, acute spine ; the metathorax with 

 two long, stout, bent, slightly divergent, acute spines. Abdomen 

 smooth, shining and subglobose, the peduncle with a sort of 

 elevated pedestal, from the summit of which are produced two 

 elongate spines, hooked and acute at their apex. 

 Hab. Burmah. 



