Fossorial Hymenoptera of North America. 409 



Canada, (Coll. Ent. Soc. Phil.), "Hudson's Bay," (Smith). 



Easily known by its very coarse net-work of fossulets, with propo- 

 deuni much more marked than in the other species, by the red tips of 

 the antennae, the very narrow second joint of the abdomen, the dull 

 puiicto-striated head, the pale reddish feet, red band on the abdomen, 

 which is narrower than usual, but a single ring being entirely red. 



Mimesa pauper, n. Bp. 



% . Head of the usual proportions, ocelli arranged in a regular equi- 

 lateral triangle; vertex well elevated, convex, surface minutely puncto- 

 striated, slightly polished ; a well marked raised line in front of the 

 anterior ocellus; a slight thin hirsixties on the vertex, front slightly 

 transversely elevated between the insertion of the antenna} ; clypeus 

 regularly elliptical in form, at base darker, as the pubescence is thinner 

 than elsewhere; terminal two-thirds of the mandibles deep red; an- 

 tennae slender, not so clavate as usual, more filiform, scape black, be- 

 neath pale reddish, brown above; terminal joint slightly reddish above, 

 sutures distinct, surface of thorax rather thickly, but minutely punc- 

 tured, polished, meta-scutellum hirsute; propodeum with the enclosure 

 distinct, very transverse, irregularly, but very broadly triangular, with 

 seven or eight minute rugae on each side of the long narrow, almost 

 obsolete mesial furrow; posteriorly a fine net-work of irregular fossu- 

 lets, and a slight shallow mesial furrow less distinctly marked than 

 usual ; hirsute, especially posteriorly. Tegulas reddish, costal nervures 

 ferruginous, pterostigma ferruginous ; femora black, sericeous, tipped 

 on the anterior pair with red ; two anterior pair of tibia; red, posterior 

 red, but dark in the middle; two anterior pair of tarsi pale red; pos- 

 terior pair black-brown, pale red at tip; pedicel two-thirds as long as 

 the width of the abdomen, quadrangular with a mesial raised promi- 

 nent ridge on the upper side ; posterior edge of 2d ring, and entire 3d 

 ring red ; terminal rings paler on hind edges, tip smooth, plain, not so 

 hirsute as usual. 



Length, .26 inch. 



Illinois, (Coll. Ent, Soc. Phil.). 



With the exception of M. unicincta, Cress., this is the smallest 

 species yet known to us. Its bronzen front, slightly clavate antenna;, 

 fine and unusually numerous stria; on the propodeum, the obliteration 

 of the mesial furrow, short pedicel and the longer mesial ridges and 

 short abdomen, the body of which is scarcely longer than the head and 

 thorax together, will easily separate it from its allies. 



PROCEEDINGS ENT. SOC. PIIILAD. FEBRUARY, 1867. 



