HYMENOPTERA. 23 



rufo-piceous, with the base palest ; in some examples the colour 

 is pale brown ; antennae longer than the body ; head ovate, nar- 

 rowed behind, and wider than the thorax ; the eyes black and 

 prominent. Thorax elongate, compressed, the prothorax nar- 

 rowed into a slender neck ; legs very much elongated, the pos- 

 terior pair one-third longer than the insect, the tibiae and tarsi 

 pale testaceous. The abdominal scale incrassate, rounded in 

 front and truncate behind ; the abdomen short and ovate. 



Hub. Singapore. 



78. Formica arrogans. B.M. 

 Worker. Length 4 lines. — Fusco-testaceous : mandibles black; 



the flagellum ])ale testaceous; the vertex deeply emarginate; 

 the head more than twice the width of the thorax. Thorax 

 compressed posteriorly ; the legs pale rufo-testaceous ; scale in- 

 crassate, rounded in front, truncated posteriorly. Abdomen 

 ovate, the posterior margin of the segments pale rufo-testaceous. 



Hab. Singapore. 



79. Formica camelina. B.M. 



Worker. Length 5 lines. — Black, elongate and slender; the 

 head narrowed behind into a sort of neck; the eyes round, 

 placed forwards at the sides of the head, nearly opposite the in- 

 sertion of the antennge. Thorax much narrowed in front, com- 

 pressed in the middle, with the metathorax swollen and elevated 

 above the prothorax; the legs elongate and sprinkled with long 

 pale hairs. Abdomen ovate, pointed at the apex, and sprinkled 

 with pale glittering hairs ; the scale of the peduncle incrassate, 

 somewhat pear-shaped. 



Hab. Singapore. 



80. Formica festina. B.M. 



Female. Length 9-10 lines. — Black and shining; thorax 

 beneath, the metathorax, legs and petiole of the abdomen pale 

 ferruginous ; the abdomen piceous beaeath. Head oblong- 

 quadrate, the mandibles and anterior margin of the face rufo- 

 piceous ; the flagellum fulvous. Thorax : beneath, the sides, 

 the metathorax and legs pale ferruginous ; the scale subovate 

 and emarginate above; the apical margins of the segments of 

 the abdomen rufo-piceous ; beneath entirely rufo-testaceous. 



Hab. Borneo (Sarawak); Java; China. 



Closely resembling the Formica ligniperda; apparently the 

 exotic form of that species. 



