68 HYMENOPTERA. 



low; the nervures ferruginous, the stigma brown. Abdomen 

 subglobose, very smooth and shining. 



Hob. Borneo (Sarawak). 



35. POLYRHACHIS RUFICORNIS. 



Female. Length 4 lines. Black : the antennae, mandibles, 

 legs, and base of the abdomen, ferruginous. Thorax elongate- 

 ovate ; wings subhyaline and iridescent, the nervures testaceous ; 

 the coxae black. Abdomen globose, the scale of the peduncle 

 with two stout, divergent spines above, which curve slightly 

 backwards. 



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



36. POLYRHACHIS CONSTRUCTOR. PL IV. fig. 23. 



Female. Length 4^ lines. Black : head and thorax opake ; 

 legs and abdomen shining. Thorax ovate, the prothorax slightly 

 produced laterally, forming a small tubercle, the metathorax 

 with two short, stout, erect teeth, or spines ; wings subhyaline, 

 the nervures rufo-testaceous. Abdomen : the node of the pe- 

 duncle incrassate, with three short, stout, acute spines. Abdo- 

 men subglobose. 



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



37. POLYRHACHIS INERMIS. PL TV. figs. 25, 26. B.M. 



Worker. Length 2J lines. Black : covered with a shining 

 grey pile ; the thorax armed at the angles of the anterior margin 

 with short acute spines ; the scale of the abdomen with its su- 

 perior margin much wider than the basal one, and rounded, not 

 spined. The thorax flattened above, its lateral margins acute, 

 divided by two distinctly marked sutures ; the head longitudi- 

 nally striated, the abdomen subglobose. 



Hab. Celebes. 



38. POLYRHACHIS RIXOSUS. B.M. 



Female. Length 4 lines. Black: head and thorax longitu- 

 dinally striated; abdomen shining and delicately rugose; the 

 thorax armed in front with two stout spines ; the scale of the 

 peduncle with five spines on its superior margin, the three cen- 

 tral spines short and acute, the lateral pair rather longer and 

 also acute. The head and thorax slightly pubescent ; the extreme 

 apex of the flagellum pale ferruginous; the metathorax trun- 

 cated, slightly concave ; legs slightly pubescent, the claws pale 



