8. B. Buckley on North American Formicidae. 341 



tathorax below the mesothorax, truncate, two short spines project hack 

 from its upper surface; scales nodose, subequal ; abdomen oblong- 

 ovate, subacute; legs short, slender; wings extend beyond the 

 abdomen 0.13 inch ; whole ant rather thickly sprinkled with short, 

 minute, gray hairs. 



Worker. Length 0.12 inch. — Eyes small, circular ; occiput slightly 

 emarginate; head wider than the prothorax; mesothorax slightly de- 

 pressed, and a small strangulation between it and the metathorax, on 

 the posterior surface of which are two large spines projecting back ; 

 pedicle short ; scales nodose, posterior one largest ; abdomen triangu- 

 lar, acute ; otherwise like the female. 



In the ground beneath stones, near Columbia College, Washing- 

 ton, D. C. 



49. Myrmica Monomariuru) aquia, n. sp. 



Worker. Length 0.22 inch. — Abdomen piceous, the rest yellowish- 

 red, or reddish-brown ; head ovate, rounded above; eyes small, circu- 

 lar, lateral, placed about midway of the head; antennae at the sides of 

 the clypeus, long, clavate; mandibles small, subtriangular towards the 

 apex, curved inwards aud downwards near their apices, toothed; pro- 

 thorax narrower than the head, rounded above, in front, at the sides, 

 enlarged posteriorly ; mesothorax depressed and strangulated at its 

 junction with the metathorax; metathorax raised a little, elongated, 

 with two small spines on its posterior upper surface, which are a little 

 inclined posteriorly; pedicle long; scales nodose, the anterior one 

 somewhat wedge-shaped, and smallest ; abdomen round-ovate, scarcely 

 larger than the head ; legs long, slender ; upper surface of the head, 

 thorax and abdomen thickly sprinkled with hairs; of slender form 

 throughout. 



Female. Length 0.2(5 inch. — Reddish brown, abdomen piceous; 

 eyes large; ocelli 3, placed a little back of the vertex; wings extend 

 0.12 inch beyond the abdomen; prothorax J wider than the head, 

 somewhat compressed at the sides and flattened at the top; mesothorax 

 not depressed, of nearly equal width to the prothorax; metathorax 

 inclined gradually to the pedicle, with two short spines near its centre; 

 posterior scale nearly twice the size of the anterior; abdomen oblong- 

 ovate; otherwise like the worker. 



In the ground, at Aquia, Ya.. and also in Western New York. 



50. Myrmica (Monomariumi saxicola, n. sp. 



Length 0.12 inch. — Yellowish-brown, legs and whole surface be- 

 neath honey-yellow ; head quadrate, rounded above, and posterior 



