26 



HYMENOPTERA. 



apical margins of the segments more or less rufo-piceous ; the 

 scale of the peduncle ovate and entire ; a thin pale reddish pu- 

 bescence on the head, thorax and legs. 



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



88. Formica tenuipes. B.M. 



Female. Length 4 lines. — Rufo-castaneous, smooth and 

 shining ; mandibles stout, armed with five strong black teeth ; 

 antennae pale rufo-testaceous. Thorax ovate, smooth and shining; 

 wings hyaline, the nervurespale testaceous; scale quadrate, emar- 

 ginate above ; the legs pale rufo-testaceous ; the femora much 

 compressed. Abdomen ovate, smooth and shining. 



Hab. Borneo (Sarawak). 



89. Formica p.\llida. B.M. 



Worker. Length 2.V-.3 hnes.— Pale rufo-testaceous, smooth, 

 shining and slightly pilose; the head much wider than the thorax, 

 the vertex widely and deeply emarginate ; mandibles dark rufo- 

 piceous ; the ilagellum and legs paler than the rest of the body ; 

 the thorax compressed behind ; the scale narrow, elongate-ovate ; 

 abdomen subglobose and thinly sprinkled with long pale hairs ; 

 the head and thorax also slightly pubescent. 



Hab. Borneo (Sarawak). 



This species varies in the colouring of different individuals : 

 some examples have the head as well as the abdomen of a deeper 

 hue. 



i)0. Formica vigilans. B.M. 



Worker. Length 5^ lines. — Head, thorax, and scale of the 

 ."vbdomen, blood-red ; the abdomen and legs black ; the antennae, 

 eyes and mandibles black ; the face anteriorly, the clypeus and 

 mandibles, smooth and shining, the latter with five stout teeth ; 

 the ilagellum obscurely rufo-fuscous ; the head posteriorly deeply 

 emarginate and opake ; the thorax opake, compressed ; the 

 coxa;, extreme base of the femora and tibiae, and the apical joints 

 of the tarsi, ferruginous ; the scale ferruginous, ovate and entire ; 

 the extreme base of the abdomen ferruginous. The entire insect 

 thinly sprinkled with erect black pubescence. 



Hab. Borneo (Sarawak). 



In general form closely resembling F. compressa ; the thorax 

 is shorter, the legs stouter, and F. eompressa is not pubescc 



