Fossorial ITi/menoj>tera of North America. 407 



ing sericeous towards the tip; sutures well impressed; segments with 

 a dense fine short hirsuties ; pedicel and anterior part of 2d ring black, 

 3d and 4th red, the remainder black, 5th ring red on the posterior 

 edges. 



Length of body, .32 ; head and thorax, .12; abdomen, .20 inch. 



Illinois, (Coll. Ent. Soc. Phil.). New York, (Norton). 



This species will be easily recognized by its denticulated, very cla- 

 vate, red antennae, its long sleuder body, the distinct though small 

 mesial furrow ou the propodeum, a>nd the two anterior pair of tibiae 

 which are fuscous ; the trout is silvery, straighter and narrower thau in 

 M. Cressonii. 



Mimesa nionticola, n. sp. 



% . Head broad and short, vertex much elevated, and very convex, 

 ocelli prominent, arranged in a low triangle; surface minutely punc- 

 tate, though not densely so, polished and shining, slightly and finely 

 hirsute, a raised line leading from the anterior ocellus and graduating 

 into the slightly marked interantennal ridge, front densely silvery pu- 

 bescent high up the orbits as far as the anterior ocellus, clypeus more 

 than usually elevated, surface convex ; mandibles red, shining. An- 

 tennae unusually long and filiform, not at all thickening towards the 

 tips, long and slender jointed, almost imperceptibly dentate beneath; 

 basal joint of flagellum as long as the middle joint of the scape ; su- 

 tures very distinct, joints of scape dark red, almost black, tipped with 

 red, flagellum paler red beneath, darker dull red above. Prothorax 

 well crested, angular on the sides, behind the crest, thickly pubescent; 

 meso-scutum thickly punctured, pubescent mesial and sub-mesial lines 

 anteriorly distinct ; meta-scutellum with long hirsuties, flanks thickly 

 pubescent ; propodeum with the enclosure very distinct, narrower than 

 usual, with three distinct high and narrow ridges on each side of the 

 very broad and distinct mesial furrow, the enclosed fossa} regularly ob- 

 long, deep and polished at bottom ; posteriorly angulated, owing to the 

 high and unusually large irregular ridges ; a large ridge on each side, 

 and within on each side of the mesial furrow which is broad, depressed, 

 the tumid angulated sides rise up from it gradually. Tegula3 and 

 nervures and pterostigma pale-red, legs pale testaceous reddish; fore 

 femora blackish above, hind femora black, tibiae pale fuscous, testa- 

 ceous, hind pair darker in the middle; all the tarsi uniformly concolo- 

 rous with the fore tibiae. Abdomeu, excepting the pedicel, as long as 

 the head and thorax together; pedicel much curved, nearly as long as the 

 abdomeu is wide, its surface broad and flattened above, sides expanded, 



