S. B. Buckley on North American Formiculse. 345 



erect ami diverging, pedicle long, anterior one wedge-shaped, posterior 

 one nodose; abdomen ovate, obtuse ; legs long, slender 5 abdomen and 

 the whole upper surface of the body thickly sprinkled with long 

 hairs. 



Worker minor. Length 0.08 inch. — Head ovate, rounded above, at 

 the sides and posterior angles; not emarginate, antenna? long filliform, 

 clavate; tarsi hyaline; very slender throughout, and less hairy than 

 worker major; otherwise like the worker major. 



Beneath stones near Austin, Texas. 



58. Atta brazoensis, 11. sp. 



Worker major. Length 0.21 inch. — Head, thorax and legs reddish- 

 brown ; abdomen piceous; head broad-ovate, round above, sides and 

 posterior angles rounded, occiput slightly emarginate; eyes small, la- 

 teral, circular, about midway of the head; antenna? short clavate, at 

 the base of the clypeus; mandibles small, curved inwards and down- 

 wards, slightly enlarged in front, toothed ; prothorax \ less width than 

 the head, rounded in front, at the sides, and but little above, widest in 

 the middle; mesothorax a continuation of the prothorax, narrowed 

 back to the metathorax, which is depressed and slightly rounded above, 

 and at the sides, subtruncate; pedicle long ; front scale smallest and 

 sub-wedge-shaped; posterior one nodose; abdomen large, oblong-ovate ; 

 legs slender ; upper surface of head, thorax and abdomen thickly sprin- 

 kled with bairs. 



Workt r minor. Length 0.12 inch. — Head sub-ovate, its sides nearly 

 parallel, not emarginate, slightly channeled below, ]- wider than the 

 prothorax; abdomen small, ovate; legs long, slender; otherwise like 

 the worker major. 



Dwells in the ground in Northern Texas near the Brazos river. 



59. Atta pennsylvanica, n. sp. 



Worker major. Length 0.23 inch. — Abdomen piceous, the rest 

 reddish-yellow or pale yellow; head ovate, its posterior angles and up- 

 per surface rounded, slightly emarginate; antennae short, the two api- 

 cal joints much enlarged; eyes small, circular, lateral, and a little in 

 front of the middle, two small ridges are on each side of the epistoma 

 extending nearly back to the vertex ; mandibles small, curved inwards, 

 acute; prothorax about •> the width of the head, rounded laterally, 

 widest in front of the middle ; mesothorax depressed, sub-strangulated ; 

 metathorax rounded above, at its sides, and gradually sloping to the 

 pedicle; pedicle long; nodes subequal, front one smallest and sub- 

 wedge-shaped ; abdomen oblong-ovate; legs long, slender; whole ant 

 .-month and not hairy. 



PROCEEDINGS ENT. SOC. PHILAD. FEBRUARY, 1S67. 



