S. B. Buckley on North American Formicidse. 335 



Descriptions of new species of North American FORMICIDiE. 

 BY S. B. BUCKLEY. 



[Continued from ]>ar;e 172.] 



'■',7. Odontomachus texana, n. sp. 



Worker. Length 0.39 inch. Head, thorax and legs reddish-brown; 

 abdomen black or bronze; head oblong, and widest anteriorly; eyes 

 small, black, subelliptical; antenna filiform and inserted in front; two 

 prominent ridges commence near the base of the antennae and diverge 

 forwards ou each side of the epistoma, a channel extends back from the 

 mandibles, on each side between the eyes, to a little beyond the middle 

 of the head, where they form one channel which extends back, dividing 

 the occiput into two rounded lobes; under surface of the head depress- 

 ed and flattened between its outer margins ; mandibles long and pro- 

 jected straight in front, being curved near their ends, and having two 

 sharp teeth on each inner margin, at apex, the inner margins are also 

 crenate or serrated with short blunt teeth; thorax long, large, and but 

 little narrower than the head; prothorax short and rounded above; 

 niesothorax largest and raised highest, with a small circular elevation 

 on its posterior margin ; metathorax also larger than the prothorax ; 

 the whole compressed, lateral, and with the divisions well marked; pe- 

 dicle short; scale large, erect, wedge-shaped and pointed; abdomen 

 oblong-ovate, acute; legs long, slender, and of a lighter color than the 

 thorax and head. 



Has cells beneath rocks, in Northern Texas. 



::^. Myrmica rubra, n. sp. 



Worker. Length 0.19 inch. — Reddish brown, legs and under sur- 

 face of a lighter shade ; head subquadrate, with its sides a little 

 rounded, oval above; occiput emarginate, its posterior angles not 

 rounded ; antennae inserted at the base of the clypeus, approximate, 

 short, clavate ; a short ridge midway between bases of the antennae; 

 eyes minute, and like ocelli, placed on the upper sides a little back of 

 the middle of the head, circular; under surface of the head rounded, 

 smooth, with a deep concavity beneath the occiput; mandibles of me- 

 dium size, curved inwards and downwards, toothed at their apices, 

 enlarged anteriorly; prothorax J — •] less in width than the head, oblong, 

 sub-compressed at the sides, rounded above; mesothorax depressed 

 with a slight strangulation between it and the metathorax ; metathorax 

 descends gradually to the pedicle ; nodes large, rounded and narrow- 

 ed anteriorly, posterior one the largest; abdomen small, ovate; legs 



