S. B. Buckley on North Amtrican Formic Ulsc. 337 



long, nodes rounded, anterior one smallest; abdomen round-ovate, sub- 

 obtuse, smaller than the bead; legs long, slender; whole ant rather 

 thickly sprinkled with short, white hairs. 



California (Xantus). From the Collection of the Acad. Nat. 

 Sciences, Philadelphia. 



II. Myrmicanovaeboracensis.il. sp. 



F< moil. Length 0.2i> inch. — Head, thorax and abdomen piceous, 

 with dark shades of reddish-brown on the pedicle, scales and legs; head 

 broad-ovate, rounded above, at the sides and posterior angles; eyes 

 small, circular, lateral, placed about midway of the head; antenna' 

 inserted on the sides of tbe clypeus. short, clavate; ocelli 3, placed on 

 vertex of occiput ; mandibles small, reddish-brown, sub triangular, 

 toothed on their inner margins, which are tinged with black ; head a 

 little wider than the prothorax ; prothorax rounded in front, above, and 

 slightly so at the sides; mesothorax larger, rounded, and above the 

 pro- or metathorax ; metathorax small, truncate, with two small spines 

 near its posterior base; pedicle short; scales small, nodose, nearly 

 equal ; abdomen broad-ovate, subtruncate in front; legs short, slender; 

 whole ant of a compact, robust form, and thickly sprinkled with short 

 hairs. Wings extend about a line beyond the abdomen. 



Bab. — New York. (Norton). 



42. Myrmica (Monomarium) diversa, n. sp. 



Female. Length 0.27 inch. — Color, honey-yellow, or yellowish- 

 brown ; wings project beyond the abdomen; head triangular, rounded 

 above ; ocelli present in a triangle on the top of the head, a little back 

 of the vertex; mandibles triangular, short, large, curved inwards and 

 downwards, posterior angles of occiput slightly rounded, and occiput 

 not emarginate, but nearly straight; antennas short, and somewhat en- 

 larged towards the apical joint ; eyes small, circular, lateral, and placed 

 in front of the middle part of the- head; the central part of the under 

 surface of the head nearly flat, concave before and behind; prothorax 

 about equal in width to the head, large, rounded, raised above the 

 mesothorax; mesothorax small, not depressed; metathorax short and 

 steep posteriorly, with two small spines; pedicle of medium length ; 

 scales rounded, posterior one the largest ; abdomen oblong-ovate. 



Worker major. Length '11 inch. — Head, legs and thorax reddish 

 brown; abdomen piceous; bead large, oblong, with its sides nearly 

 parallel, and varying much in size; a longitudinal channel extend* 

 from the clypeus over the top of the bead to the base of occiput ; 

 occiput deeply emarginate. posterior lobes of the head rounded; eye* 



PROCEEDINGS BUT. S0C. PHILAD. FEBRUARY, 1867. 



