1903.] NATURAL SCIENCES OF PHILADELrHIA. 231 



Yellow or reddish-yellow, dorsal surface of head, terminal half of 

 funiculus and the gaster, with the exception of the anterior, lateral 

 and posterior borders of the segments, both on the dorsal and ventral 

 surfaces, black or dark-brown. 



Female. — Length 2.5-3.5 mm. 



Like the worker. Thoracic dorsum dark-brown, rather shining; 

 mesonotum and scutellum traversed by distinct, rather widely sep- 

 arated, longitudinal rugoe; pronotum and epinotum coarsely reticu- 

 late rugose, the rugae of the latter being continued up onto the dorsal 

 and lateral surfaces of the stout, blunt spines. Pleurae subopaque, 

 coarsely reticulate rugose, the meshes being occupied by aggregated 

 shallow foveolae. Node of petiole somewhat more acute than that of 

 the worker. Wings grayish hyaline, veins and stigma dirty yellowish. 



Male. — Length 2.5-3 mm. 



Mandibles very small, not distinctly dentate and far from meeting 

 each other with their blades. Antennae 12-jointed; scape hardly as 

 long as the three first joints of the funiculus together, first funicular 

 joint very short, the others cylindrical, of uniform thickness but in- 

 creasing graduallv in length toward the tip. Parapsidal and other 

 thoracic sutures very distinct. Epinotum with two very short rugose 

 projections in the place of the spines. Petiolar node low, rounded, 

 its anterior slope slightly concave, its posterior slope shorter and con- 

 vex. Postpetiole hemispherical. Gaster somewhat less flattened and 

 narrower than in the worker. 



Mandibles striated. Clypeus even in the middle with a few delicate 

 longitudinal rugae. Head above longitudinally reticulate rugose; 

 rugae radiating backward and laterallj^ from the posterior ocelli as 

 centers. Thorax rather smooth, indistinctly punctate. Pedicel and 

 gaster glabrous. 



Hairs almost completely absent on the head and thorax, short and 

 inconspicuous on the legs, long on the pedicel and gaster, but nowhere 

 truncated at their tips. 



Brownish-yellow like the worker. Head, thoracic dorsum, pedicel 

 and gaster, and the middle portions of the femora and tibiae somewhat 

 darker. Wings as in the female. 



Type locality: Colebrook, Litchfield county. Conn. Males and 

 females appearing in August. 



This species always lives in xenobiosis with a larger Myrmicine ant 

 (Mijrmica hrevinodis Emer}^ in the hummocks of moss {Polytrichum 

 commune), under stones, bits of wood, etc., in rather damp, grassy 

 bogs. The Leptothorax occupy separate nests, which, however, com- 



