HYMENOPTERA. 21 



upper margin rounded and entire ; wings hyaline, the superior 

 pair yello^vish along their anterior margin, the nervures pale 

 rufo-testaceous. 



Hab. Ceylon. 



71. Formica Bacchus. B.M. 



"Worker. Length 4i lines. — Black : the flagellum, thorax, 

 legs and scale of the peduncle rufo-testaceous; the tibiae and 

 basal joint of the tarsi more or less dusky ; head large and cor- 

 date ; eyes ovate, placed above the middle at the sides of the 

 head ; the head opake ; the clypeus subcarinate in the middle 

 and shining, as w'ell as the mandibles, the latter armed with six 

 stout teeth ; the extreme base of the scape pale testaceous. 

 Thorax much narrower than the head, rounded anteriorly and 

 compressed behind. Abdomen : the scale incrassate, narrowed 

 to a thin edge at its upper margin, which is rounded ; the scale 

 is narrow, rounded in front and straight behind ; the abdomen 

 oblong-ovate ; the head, thorax and abdomen have a few scat- 

 tered, long, erect pale hairs. 



Hab. Ceylon. 



72. Formica oblonga. B.M. 



Female. Length 4f lines. — Obscure rufo-testaceous, the head 

 anteriorly and the abdomen being darkest ; the clypeus and a 

 space between the antennae, as well as the flagellum, pale rufo- 

 testaceous ; the mandibles with seven acute teeth ; the clypeus 

 truncate anteriorly. Thorax elongate-ovate, smooth and shining, 

 the disk darkest ; the legs pale rufo-testaceous ; the femora 

 compressed and semitrausparent. The scale of the peduncle 

 ovate, very faintly notched above ; the abdomen elongate-ovate, 

 smooth and shining ; the abdomen wider than the thorax and 

 head, the two latter of about equal width. 



Hab. Birmah. 



73. Formica tincta. B.M. 



Female. Length 5|^ lines. — Rufo-testaceous, u-regularly 

 stained with black; the front of the head with a black spot 

 enclosing the ocelli; the mandibles dark rufo-piceous, armed 

 with seven sharp teeth ; the head the same width as the thorax. 

 Thorax elongate-ovate, very smooth and shining; the sides of 

 the disk of the thorax shghtly fuscous ; wings yellowish-hyaline, 

 with the nervures ])ale ferruginous. Abdomen ovate, very smooth 

 and shining ; the basal segment and the apical margins of the 



