52 Journal New York ENTO>roLOGicAL Society. [^'°1- xxii. 



distinctly smaller and perhaps a little darker than the workers of the 

 var. molefaciens Buckley from Texas, but the male has the head, 

 thorax and node of the petiole black, whereas these parts are reddish 

 yellow like the rest of the body in molefaciens. Moreover the wing- 

 veins and stigma are brown and not resin yellow as in the Texan 

 variety. In the female the epinotal spines are as long and slender 

 as in the worker, but in molefaciens they are very short and broad at 

 the base. The color of this sex is the same as that of the female 

 tnolefacicns. 



At Pachuca P. harbatus inhabits large, flat, crater nests about 4 

 feet in diameter in the open, arid country. 



21. Myrmica mexicana new species. 



Worker. — Length 3.5-5 mm. 



Closely allied to the European M. sulciuodis Nyl. Head distinctly longer 

 than broad. Antennal scapes shaped like those of sulcinodis or rather of the 

 var. siilcinodis-scabrinodis Forel, bein.g a little more sharply bent at the base 

 and in some specimens with a small tooth or ridge at the angle as in some 

 forms of scabrinodis. The joint is of nearly uniform thickness throughout. 

 Funiculi with a 3-jointed club, which in some specimens, seems to be indis- 

 tinctly 4-jointed. Spines of the epinotum straight or very slightly bent down- 

 ward, somewhat shorter than those of sulcinodis and not recurved at their tips. 

 Petiole in profile a little longer than high, shaped as in sulcinodis. not peduncu- 

 late, its node with subequal declivities, the anterior feebly concave, the pos- 

 terior feebly convex, both meeting at a rather sharp angle. Postpetiole also 

 as in sulcinodis, distinctly higher than long. 



Sculpture very coarse and much as in sulcinodis, with shining interrugal 

 spaces, but the longitudinal trend of the ruga; is not so distinct on the thorax 

 and pedicel, often vermiculate on the thoracic dorsum and the nodes. Frontal 

 area rugose, opaque. 



Hairs like those of sulcinodis, but of a gray instead of a yellow tint. 



Deep cherry red, legs a little darker; gaster, clypeus and anterior half of 

 head, black. In many specimens the whole head and thorax are dark brown 

 or blackish. 



Female (dealated). — Length 5.5 mm. 



Closely resembling the worker and differing greatly from the female sul- 

 cinodis in color, being like the darkest workers, with the upper surface of 

 the thorax and the whole head blackish. 



Male. — Length 5-5.5 mm. 



Differing from the male of sulcinodis in its larger size and in color, the 

 body being deep black, with only the legs and genitalia piceous, and the 4- 

 jointed clubs of the antennre and tips of the mandibles clear yellow. The wings 

 are more grayish and longer (6 mm.), whereas those of sulcinodis measure 



