S. B. Buckley on North American Formicidse. 171 



between it and the metathorax; metathorax oblong, narrower than the 

 prothorax, slightly compressed and enlarged posteriorly, and elevated, 

 sub-truncate; node incrassate, enlarged posteriorly, then truncate; 

 abdomen elongated, acute, with a small strangulation between the first 

 and second segments. 



Hub. — Archer County, Northern Texas, beneath red sandstones. Is 

 rather thickly sprinkled with short hairs and is quick in its move- 

 ments. 



33. Pomera amplinoda, n. sp. 



Length 0.29 inch. — Black or piceous; tibioc, tarsi, mandibles and 

 last segment of the abdomen piceous or reddish-brown; head quadran- 

 gular, somewhat rounded above and at the sides, not emarginate; an- 

 tennae inserted at the base of the clypeus, short, clavate; eyes small, 

 circular, lateral, placed in front of the middle; mandibles large, cylin- 

 drical near their bases, then widened, triangular, acute, inner margins 

 finely toothed, each alternate cne largest; head somewhat flattened 

 below ; prothorax narrower than the head, rounded above and com- 

 pressed at the sides, divisions of the thorax slightly marked, the whole 

 being rounded above, compressed at the sides and narrowed posterior- 

 ly; scale incrassate, subquadrate, truncated before and behind, widen- 

 ed posteriorly ; abdomen broad-ovate, and but slightly constricted be- 

 tween the first and second segments. 



I fab. — Central Texas, beneath rocks. Bare. 



34. Ponera Pennsylvanica, n. sp. 



Length 0.12. — Upper surface of head, thorax and abdomen dark 

 reddish-brown or piceous, mouth, last segment of the abdomen, legs 

 and part of the under surface of the thorax pale yellow; head sub- 

 triangular, rounded above, occiput slightly emarginate; antennas short, 

 12-jointed and much enlarged towards their apical joints; eyes none; 

 mandibles large, subtriangular, toothed ; under surface of head not 

 sinuate; prothorax a little narrower than the head, rounded above, at 

 sides and iu front; mesothorax not depressed, and but little narrower 

 than the prothorax ; metathorax rounded at sides, narrower than pro- 

 thorax. truncate; scale large, subquadrate, its posterior part highest; 

 abdomen oblong, sub-cylindrical, acute, truncate in front, a strangula- 

 tion between the first and second segments; whole ant nearly or quite 

 destitute of hairs. 



Dwells beneath stones in the vicinity of Philadelphia. 



