S. B. Buckley on North, American FormicidsB. 161 



II. Formica septentrionale. n. sp. 



Worker. Length 0.25 inch. — Head and abdomen black ; thorax, 

 legs and scale reddish-brown, with piceous spots ; head broad, oval or 

 subquadrate, the front, back of the mandibles, as broad as the occiput, 

 the sides, posterior angles and upper surface rounded, under surface 

 -innate; antennae long, filiform, and but slightly enlarged towards the 

 apical joints; eyes lateral, circular, and a little back of the middle; 

 mandibles small, curved inwards, acute; prothorax one-third narrower 

 than the head, round above and in front, slightly compressed at the 

 sides, widest in the middle; mesothorax not depressed, slightly round- 

 ed above, compressed at sides, narrowed behind, having a triangular 

 outline, with its apex back seen from above; m eta thorax narrow, short, 

 compressed, subtruncate; scale thin, wedge-shaped, vertical; abdomen 

 round-ovate; margins of the segments hyaline; whole ant smooth, 

 without hairs, and shining. 



Female. Length 0.3(1 inch. — Wings extend 0.05 inch beyond the 

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

 obsolete; a very few scattering hairs on the abdomen; otherwise like 

 the worker. 



Jlab. — Michigan and Illinois, (Norton). 



15. Formica Floridana, n. sp. 



Worker. Length 0.28 inch. — Abdomen black, the rest yellowish- 

 red ; head subcordate. rounded above, occiput emarginate, with the 

 posterior angles rounded ; two short channels a little diverging extend 

 back from the clypeus to the vertex ; antennas inserted a little in front 

 of the vertex; long, filiform, and but little enlarged towards the apical 

 joint ; eyes of medium size, circular, placed on top near the sides and 

 little back of the middle, prominent ; mandibles reddish-brown, curv- 

 ed inwards and toothed, apical tooth long, acute; under surface of the 

 head sinuate; prothorax narrower than the head, rounded above, in 

 front and at the sides, widest near the frout • mesothorax compressed, 

 narrowed backwards, Dot depressed ; metathorax narrowed behind, and 

 descends gradually to the pedicle; scale large, vertical and wedge- 

 shaped ; abdomen broad, ovate, subacute, margins of its segments 

 slightly hyaline ; legs long, slender; thorax throughout rather thickly 

 sprinkled with long gray hairs. 



Hub.— Florida, | Norton). 



L6. Formica Tejonia. n. >p. 



Male. Length 0.39 inch. — Black; tarsi dark reddish-brown; head 

 -mall ovate, rounded above, at sides aud behind; eyes large, promi- 



PUOCEKDINGS EST. SOC. PHILAD. JULY, L866. 



