o40 S. B. Buckley on North American Formiculx. 



the head, somewhat compressed, widest in front, a little flattened above; 

 inesothorax not depressed, narrower than the pro- or rnetathorax ; rneta- 

 thorax has two short spines on its upper posterior surface, from which 

 it is steep to the pedicle, subpunctate near its base; scales large, 

 anterior oue somewhat wedge shaped and obtuse, posterior one nodose; 

 abdomen smooth, shining, ovate, subtruncate in front, obtuse behind ; 

 legs long, slender; upper surface of head, thorax and abdomen thinly 

 sprinkled with white hairs. 



On hills, beneath rocks, near Austin, Texas. 



47. Myrmica (Monomarium) lineolata, n. sp. 



Worker. Length 0.17 inch. — -Head, thorax and abdomen piceous, 

 varied with dark reddish-brown spots ; legs, antennae and mandibles 

 reddish-brown ; head subquadrate, with its sides nearly parallel, round 

 above, posterior angles rounded ; antennae inserted on the sides of the 

 clypeus, short, clavate ; mandibles curved in and downwards, toothed 

 on their inner margins; eyes small, circular, lateral, placed about mid- 

 way of the head ; prothorax narrower than the head, round above, at 

 sides and in front, widest in the middle ; mesothorax not depressed, 

 its sides compressed, a little narrower than the pro- or rnetathorax ; 

 rnetathorax with its sides a little rounded, and with two spines on its 

 upper posterior part, diverging and inclined back a little, subtruncate; 

 scales large, nodose, front one a little the smallest; abdomen round- 

 ovate, subobtuse; upper surface of head and thorax finely and longi- 

 tudinally striated ; striae rough and finely granulated ; abdomen 

 smooth ; legs long, slender ; head, thorax and abdomen thickly 

 sprinkled with short hairs. 



Female. Length 0.24 inch. — Head ovate, round above, at the sides 

 and posteriorly; eyes large, prominent; mesothorax about the same 

 width as the prothorax ; abdomen broad, round-ovate; otherwise like 

 the worker. 



18. Myrmica (Monomarium) columbiana, n. sp. 



Female. Length 0.39 inch. — Black ; pedicle, antennae, nodes and 

 legs piceous; margins of the segments of the abdomen hyaline; head 

 subovate, rounded above, posterior angles rounded, not emarginate ; 

 ocelli placed near and back of the vertex ; eyes large, subelliptical, 

 lateral, placed about midway ; antennae inserted at the base of the 

 clypeus, short, clavate; mandibles reddish-brown, short, triangular 

 and finely toothed ou their inner margins ; prothorax about equal in 

 width to the head, rounded above, in front and at the sides, widest in 

 the middle; mesothorax small, narrowed back and not depressed; me- 



