COLLECTED IN BORNEO, ETC. DO 



10. Formica diligens. F. obscure rufo-picea ; antennis, mandibulis, 

 thorace subtus et lateribus, metathorace peclibusque lacte rufis ; ab- 

 domine subtus pallide rufo-testaceo. 



Female. Length 9 lines. Head shining, dark rufo-piceous ; the carina; 

 at the insertion of the antennae, the antennae, the anterior margin of 

 the face and clypeus, and the mandibles, ferruginous. The thorax 

 and legs ferruginous, with the mesothorax above and the scutellum 

 dark rufo-piceous ; wings subhyaline, the nervures and tegulae pale 

 ferruginous. Abdomen shining dark rufo-piceous, beneath pale rufo- 

 testaceous ; scale subquadrate, its superior margin slightly emarginate 

 its entire width. 



Hab. Malacca. 



This insect closely resembles the F. Hamper da. 



11. Formica irritans. F. capite abdomineque nigro-fuscis ; an- 

 tennis, thorace, abdomine, squamula pedibusque ferrugineis. 



Worker. Length 6 lines. Elongate and slender ; head ovate ; dark 

 fuscous ; the apex of the scape and the flagellum ferruginous ; the 

 clypeus and mandibles dark rufo-piceous. The thorax, scale of the 

 abdomen and the legs, ferruginous ; the thorax elongate, compressed, 

 with the prothorax very slightly dilated at the sides. The scale of the 

 abdomen incrassate, rounded anteriorly and truncate behind. Ab- 

 domen ovate, nigro-fuscous ; the entire insect sprinkled with erect 

 pale hairs. 



Worker minor. Length 3 lines. Only differs in having the antennae 

 entirely pale ferruginous and the anterior legs stouter. 



Hab. Malacca; Borneo (Sarawak). 



This is probably the worker of F. diligens. 



12. Formica fervens. F. capite abdomineque obscure rufo-piceis, 

 thorace pedibusque pallide ferrugineis. 



Worker. Length 4 lines. Head nigro-piceous, thorax and legs pale 

 ferruginous ; head subopake, with the mandibles and clypeus slightly 

 shining, the latter with scattered punctures ; the flagellum pale fer- 

 ruginous ; the anterior margin of the clypeus slightly emarginate. 

 Thorax more or less fuscous in front, compressed behind. Abdo- 

 men black and shining, with the apical margins of the segments nar- 

 rowly testaceous ; thinly sprinkled with pale hairs ; the scale ovate 

 and ferruginous. 



Hab. Borneo (Sarawak). 



13. Formica gracilipes. F. ferruginea, abdomine (basi excepto) 

 obscure rufo-piceo. 



Worker. Length 2 lines. Pale ferruginous, abdomen dark rufo-piceous ; 

 antennae longer than the body ; head ovate, and wider than the tho- 

 rax, narrowed behind ; the eyes black and prominent. Thorax elon- 

 gate and compressed ; the prothorax narrowed into a slender neck ; 



