66" HYMENOPTERA. 



28. POLYRHACHIS CUSPIDATUS, 



Worker. Length 2 lines. — Black : the head subovate ; the 

 base of the scape, the apex of the flagellum and the tips of the 

 mandibles ferruginous. Thorax slightly compressed, the pro- 

 thorax with an elevation in the middle which terminates above 

 in two chvergent spines, there is also a similar elevation termi- 

 nating in a spine on each side of the metathorax; the coxae, 

 femora and apical joints of the tarsi ferruginous. Abdomen 

 ferruginous at the base, the scale of the peduncle quadrate, 

 deeply notched above. 



Hob. Borneo (Sarawak). (Coll. W. W. Saunders, Esq.) 



29. POLYRHACHIS EQUINUS. 



Worker. Length 3 lines. — Black and shining: the thorax 

 flattened above, the metathorax and the scale of the petiole bi- 

 spinose, the legs pale ferruginous. Head shining and delicately 

 rugulose ; the palpi pale testaceous. Thorax with the lateral 

 margins acutely edged, the sides of the thorax delicately striated, 

 the prothorax above slightly concave and horseshoe-shaped ; 

 the metathorax also slightly concave, with the posterior angles 

 acute and elevated, the metathorax smooth and shining behind. 

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

 elevated, with two stout teeth above, the sides oblique ; the scale 

 is narrowest at its base. 



Hab. Borneo (Sarawak). (Coll. W. W. Saunders, Esq.) 



30. POLYRHACHIS VINDEX. B.M. 



Worker. Length 2\ lines. — Black, slightly shining : the tho- 

 rax flattened above, with two acute spines in front. The head 

 and thorax covered with shining hoary pile, the former longi- 

 tudinally striated ; the apex of the flagellum beneath and 

 the palpi pale rufo-testaceous. The thorax delicately striated 

 longitudinally, divided by two distinct sutm-es, the lateral mar- 

 gins raised and acute, the posterior angles of the metathorax 

 produced into acute spines ; the tibise and femora ferruginous, 

 more or less fuscous at their apex. Abdomen globose, smooth 

 and shining ; the scale of the peduncle incrassate, narrowed to 

 the superior margin, which is rounded, and terminates in a minute 

 tooth laterally. 



Hab. Borneo. 



31. POLYRHACHIS RUFIPES. PI. IV. fig. 28. B.M. 



Worker. Length 2\ lines. — Black : the antennae, cheeks, 

 lower part of the face, and the legs, ferruginous; the face 



