20 



HYMENOPTERA. 



eyes ovate, situated a little above the middle at the sides of the 

 head ; the vertex slightly emarginate ; tlie clj^eus truncate in 

 front, and having a slightly elevated central carina ; the man- 

 dibles stout, shining, with seven acute teeth on their inner 

 margin ; the flagellum and tips of the scape pale ferruginous ; 

 the head beneath and the region of the clypeus paler than the 

 vertex, which is opake. Thorax and legs pale fen-ugiuous ; the 

 mesothorax darker, and sometimes a darker tinge on the scutellum 

 and metathorax ; the disk of the thorax opake ; wings flavo- 

 hyaline, the nervures pale rufo-testaceous. Abdomen ovate ; 

 the base and a spot on each side of the two following segments 

 pale rufo-testaceous ; the maculae on the second segment fre- 

 quently united in the middle ; the scale of the peduncle pale, 

 subovate, and emarginate above; the abdomen sprinkled with 

 long pale hairs, and with the middle beneath pale. 



Worker. Length 3|— 4 lines. — Differs from the female in 

 having the head large, much wider than the thorax, the thorax 

 much attenuated posteriorly, and the scale of the peduncle not 

 emarginate ; the head is also darker in colour and more deeply 

 emarginate behind ; the abdomen is usually only pale at the base 

 and on each side of the second segment. 



Hab. Ceylon ; Singapore. 



This species very much resembles the F. sexguttata of Fabricius. 



69. Formica mitis. B.M. 



Worker. Length 3^ lines. — The head, scape and abdomen 

 fusco-testaceous. The head oblong, not wider than thorax ; the 

 eyes ovate, of moderate size, placed high on the sides of the 

 head ; the clypeus carinate in the middle, the anterior margin 

 rounded ; the clyjjeus paler than the vertex. Thorax elongate, 

 much compressed behind ; the disk of the thorax arched length- 

 ways ; the legs palest at their base and apex ; the scale of the 

 peduncle somewhat conical, pointed above; the base of the 

 abdomen pale, the margins of the segments fringed with a few 

 long pale hairs. 



Hab. Ceylon. 



70. Formica ventralis. B.M. 



Female. Length 6 lines.— Black : the flagellum, mandibles, 

 anterior margin of the face, and the head behind more or less 

 ferruginous ; the thorax and base of the abdomen pale rufo-tes- 

 taceous, the coXfE and femora of the same colour ; the posterior 

 margins of the first, second and third segments of the abdomen 

 pale rufo-testaceous ; the scale of the peduncle pale, with its 



