170 S. B. Buckley on North American Formicidm. 



ed sides; antennae long, clavate; mandibles small, slender, curved in- 

 wards, acute; head nearly twice the width of the prothorax, which is 

 rounded in front, on the sides, and largest in the middle; inesothorax 

 small, depressed or slightly strangulated; metathorax raised, with two 

 slight protuberences in front, truncate behind, with two rudimentary 

 spines above on each side, and two below about midway of the sides; 

 pedicle short, scale vertical, wedge-shaped; petiole inserted in the an- 

 terior basal part of the abdomen ; abdomen ovate. 



Ilab. — Central Texas. Dwells in the ground beneath stones. 



31. Polyergus Texana, n. sp. 



Female. Length 0.17 inch. — Black, margins of the segments of the 

 abdomen hyaline; head small, sub-quadrate, largest in front of the 

 middle; clypeus large, raised, a depression between its base and the 

 vertex of the head, eyes large, lateral, and placed in front; ocelli 

 placed at top of the occiput which is elevated, its posterior angles 

 rounded, convex beneath occiput and depressed below anteriorly; la- 

 brum large and porrect between the mandibles; mandibles small, pro- 

 jecting nearly straight, slightly curved downwards and inwards near 

 the apex, toothless, acute and slender ; antennae inserted at base of the 

 clypeus, filiform, short and not clavate; prothorax wider than the head, 

 raised and rounded above; mesothorax higher than the prothorax; me- 

 tathorax sub-truncate ; pedicle short ; scale small, nodose ; abdomen 

 oblong-ovate, sub-acute ; wings extend beyond the abdomen about 0.08 

 inch; legs slender; head, thorax and abdomen sprinkled with a few 

 gray hairs. 



Found beneath limestone rocks in Buchanan County, Northern 

 Texas. 



32. Ponera Texana, n. sp. 



Worker. Length 0.27 inch. — Dark reddish-brown, somewhat paler 

 beneath ; head sub-ovate, rounded above, occiput emarginate, its pos- 

 terior angles slightly rounded ; eyes large, circular, placed on the up- 

 per margins of the sides about midway of the head; antennae inserted 

 near the base of the clypeus witk only a narrow ridge between their 

 bases ; a prolongation of the carina of the clypeus extend back to near 

 the vertex ; antennae long, filiform, slightly enlarged towards their api- 

 cal joints ; mandibles long, enlarged, and widened in front, curved in- 

 wards aud downwards, acute; head rounded beneath, with a small lon- 

 gitudinal stria through its centre ; prothorax nearly as wide as the 

 head, narrowed in front, widest in the middle, rounded above and at 

 the sides; mesothorax small, somewhat depressed, depression deepest 



