S. B. Buckley on North American Formiculx. 157 



(J. Formica occidentalis. n. sp. 



Female. Length 0.32 inch. — Wings extending 0.08 inch beyond the 

 abdomen, with one marginal, two submarginal and one discoidal cells; 

 upper surface of occiput, thorax and abdomen black or piceous, the 

 rest reddish-brown, spotted with piceous; head subovate, the sides 

 slightly rounded, its upper surface but little oval, and its posterior an- 

 gles a little rounded, the occiput nearly straight between them; anten- 

 nae short, the club and flagellum of nearly equal length, clavate, joints 

 veiy short; mandibles large, curved inwards and downwards, 5-tooth- 

 ed. apical tooth long, acute; eyes small, circular, sublateral, and a 

 little back of midway of the head, which is a little wider than the pro- 

 thorax and not sinuate below; prothorax subcompressed at the sides, 

 rounded above, widest behind ; mesothorax not depressed, equal in 

 width to the prothorax, rounded somewhat at the sides; metathorax 

 narrowed behind, subtruncate; scale large, wedge-shaped, vertical; ab- 

 domen ovate, oblong, subtruncate in front, obtuse behind ; legs short, 

 slender ; upper surface of head, thorax, scale, pedicle and last segment 

 of the abdomen, thickly sprinkled with hairs. 



Worker. Length 0.11 inch. — Upper surface of head, thorax and 

 abdomen, reddish-yellow or pale yellow, the rest pale yellow ; head 

 broad, ovate, rounded above, at sides and posterior angles; prothorax 

 about one-third narrower than the head, round above, in front, at sides, 

 widest in the middle ; mesothorax narrower than the pro- or metatho- 

 rax. and strongly depressed at its junction with the metathorax; me- 

 tathorax nearly as wide as the prothorax ; rounded above and at its 

 sides, subtruncate ; otherwise like the female. 



Dwells beneath stones, in the ground, on hills at Naples, in 

 Western New York; we have also received it from Mr. Norton of Con- 

 necticut. 



7. Formica monticola, n. sp. 



Worker. Length 0.10 inch. — Upper surface of head, thorax and 

 abdomen, reddish-brown; legs and under surface honey -yellow; head 

 subovate. rouuded above and behind, not emargiuate, a shallow sinus 

 below; antennae filiform, a little enlarged towards their apical joints; 

 eyes black, circular, lateral, and about midway of the head; mandibles 

 subtriangular, curved inwards and downwards, toothed ; prothorax 

 rounded above, at the sides, in front, widest in, the middle; lnesothu- 

 rax narrower than the pro- or metathorax, raised and rounded in 

 the middle, substrangulated behind; metathorax about equal in width 

 to the prothorax, somewhat rounded above, subtruncate behind; pe- 



