S. B. Buckley on North American Formicidse. 155 



subtriangular, finely toothed on their inner margins ; prothorax one- 

 third narrower than the head, round above, in front, at the sides, and 

 widest in the middle; mesothorax compressed, inclined posteriorly, 

 and strangulated at its junction with the mctathorax ; metathorax 

 raised, compressed, widened posteriorly, subtruncate; pedicle rather 

 long; scale vertical, thin, wedge-shaped; abdomen round-ovate, and 

 thinly sprinkled with short, white hairs; legs long, slender. 



Female. Length 0.43 inch. — Tibia?, tarsi and part of the trochan- 

 ters, reddish-yellow, the rest black ; head narrower than the prothorax ; 

 mesothorax raised, higher than the prothorax and rounded above; ab- 

 domen oblong-ovate; wings extending 0.12 inch beyond the abdomen, 

 with one marginal, two submarginal and one discoidal cells ; otherwise 

 like the worker. 



ff au , — Connecticut, (Norton). We have also found this species in 

 the vicinity of Washington, D. C, and near Naples, in Western New 



York. 



For the convenience of American Students, we append the following 

 description of Formica Pennsylvanica of DeGeer, which is figured 

 and partly described by Latrielle. 

 Formica Pennsylvanica, DeGeer. 



Female. Length 0.G8 inch. — Wings with one marginal and two 

 submarginal cells, no discoidal cell ; black ; under surface of the tho- 

 rax and the abdomen, and legs spotted more or less with reddish-brown, 

 the black predominating; head large, broad ovate, rounded at the sides 

 and posterior angles ; occiput not emarginate ; eyes circular, not pro- 

 minent, placed behind the middle near the posterior angles; ocelli 

 none ; antenna? inserted a little back of the base of the clypeus, filiform, 

 very slightly, if any, enlarged towards their apical joints; thorax a 

 little narrower than the head, rounded above, at the sides and in front, 

 where there is a narrow, impressed band which extends around to the 

 sides, and is tinged with reddish-brown ; mesothorax not depressed, 

 rounded above and narrower than the prothorax, with a narrow, slight- 

 ly depressed band between it and the metathorax; metathorax short, de- 

 pressed, narrower than the pro- or mesothorax, and steep to the pedicle ; 

 scale thin, wedge-shaped, vertical; abdomen oblong-ovate; margins 

 of the segments with narrow hyaline bands, and are thickly fringed 

 with hairs. 



Worker. Length 0.39 inch. — Thorax one-third narrower than the 

 head; whole thorax narrowed behind, with no depression of its divi- 

 sions; metathorax slopes gradually to the pedicle; otherwise like the 

 female. 



