344 S. B. Buckley on North American Formicidze. 



of the head ; rnesothorax depressed, with a strangulation, between it 

 and the metathorax ; metathorax has two small spines ; pedicle Ion", 

 scales large, nodose, the posterior one largest; abdomen ovate; legs 

 long, slender; whole body moderately clothed with soft short hairs. 

 Beneath rocks in San Saba County, Texas. 



56. Atta Lincecumii, n. sp. 



Length 0.24 inch. — Smooth throughout and sparingly sprinkled with 

 hairs, reddish brown; head subcordate, rounded above, occiput emar- 

 ginate; 3 ocelli on top of the occiput; eyes black, large, circular, la- 

 teral, and in front of the middle; antennae at base of the clypeus, 

 short, clavate, head sinuate beneath ; mandibles small, curved inwards 

 and of nearly uniform size throughout, toothed at their extremities; 

 prothorax nearly as wide as the head, rounded above, at its sides, 

 widest in the middle; divisions of the thorax well marked; rnesotho- 

 rax not depressed, rounded up in the middle, a brownish-black raised 

 border on its sides and between it and the metathorax; metathorax 

 narrowed back, spineless; pedicle long; nodes nearly equal, wedge- 

 shaped; abdomen ovate-obloug; legs rather short, slender, wings not 

 seen. 



Worker major. Length 0.13 inch. — Reddish-yellow; abdomen 

 brownish-black; eyes small, circular, lateral and in front of the mid- 

 dle; thorax about £ the width of the head, smooth, somewhat rounded 

 above and narrowed back ; rnesothorax depressed posteriorly, strangu- 

 lated at its junction with the metathorax ; nodes slightly wedge-shaped ; 

 abdomen small, round-ovate, and rather thickly sprinkled with hairs ; 

 legs long, slender. The rest like the female. 



Worker minor. Length 0.10 inch. — Occiput rounded posteriorly, a 

 deep strangulation at the rnesothorax ; metathorax small, nodose, whole 

 ant slender. Otherwise like the worker major. 



Has cells in the ground 2 — 3 feet deep, throwing the excavated -dirt 

 without order at the surface. Is active and warlike. 



Hab. — Central Texas, near streams. 



57. Atta picea. n. sp. 



Worker major. Length 0.12 inch. — Black or piceous; head quad- 

 rangular, rounded above ; occiput emarginate, posterior angles rounded; 

 antennae at the base of the clypeus, short clavate ; eyes small, circular, 

 in front near the bases of the antennae, sublateral; mandibles small, 

 slender, curved inwards, acute; prothorax narrower than the head, 

 rounded above, in front where it is widest; rnesothorax slightly de- 

 pressed and rounded above; metathorax has two prominent spines. 



