158 S. B. Buckley on North American Formicidse. 



dicle short and inserted in the base of the abdomen a little in front of 

 the centre; scale large, vertical, 'wedge-shaped; legs long, slender; 

 abdomen broad-ovate, upper surface of the head and posterior part of 

 the abdomen sprinkled with short hairs. 



Female. Length 0.30 inch. — "Wings extend beyond the abdomen 

 0.11 inch, with one marginal, two submarginal, and one discoidal cells ; 

 dark-brown or piceous above; legs and under surface pale yellow or 

 yellowish-brown; head not channelled below; prothorax about one- 

 fourth wider than the head ; mesothorax not depressed, rounded above; 

 metathorax short, depressed, subtruncate ; scale vertical and wedge- 

 shaped, and concealed between the thorax and abdomen ; abdomeu 

 large, long, ovate ; legs short and slender ; whole ant smooth, not hairy. 

 Otherwise like the worker. 



Male. Length 0.11 inch. — Head very small ; eyes large; protho- 

 rax one-half wider than the head; abdomen small, subtruncate in front, 

 ovate, acute. Otherwise like the female. 



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

 Western New York. Winged in May. 



8. Formica gracilis, n. sp. 



Female. Length 0.18 inch. — Black or piceous; legs pale yellow or 

 piceous; wings projecting nearly a line beyond the abdomen, with one 

 marginal, two submarginal and one discoidal cells ; head subtriangular, 

 not emarginate, posterior angles rounded above and at the sides; an- 

 tennas in a slight depression at the base of the clypeus, rather short, 

 and but little enlarged towards their apical joints; eyes large, promi- 

 nent, circular, lateral, placed near the top and a little in front of the 

 middle ; mandibles small, curved inwards and downwards, and acute ; 

 prothorax about equal in width to the head, rounded above, in front, 

 and at the sides, and widest posteriorly; scale small, partly concealed 

 by the abdomen ; pedicle short, inserted in the base of the anterior 

 portion of the abdomen ; abdomen oblong, ovate, subobtuse; legs short, 

 slender; whole ant smooth, shining, and of slender form. 



Worker. Length 0.12 inch. — Head wider than the prothorax; pro- 

 thorax rounded above, in the front, and at the sides, widest in the 

 middle; divisions of the thorax strongly marked; mesothorax slightly 

 depressed, compressed and narrowed behind ; metathorax small, com- 

 pressed ; abdomen broad, ovate, obtuse. Otherwise like the female. 



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

 York. Winged femaels caught in May. 



