406 Dr. A. S. Packard, Jr's Revision of the 



Mimesa basirufa, n. sp. 



9 . Head much as usual, front silvery, vertex more coarsely punc- 

 tured than in 31. Cressonii or 31. argcntifrons ; the form of the clypeus 

 more closely resembles that of 31. argent ifrons ; antennae slenderer 

 than in 31. Cressonii, black above, rufous beneath; mandibles black. 

 Thorax as in 31. Cressonii ; propodeum with a distinct enclosure, with 

 longer, coarser rugae than in 31. Cressonii, and posteriorly with coarser 

 striae, arranged in the same manner as in the other species, but less 

 hairy. Legs much as usual, but the tarsi are darker than in 31. Cres- 

 sonii, and the nervures a little blacker. Abdomen long and slender, 

 pedicel shorter and broader than in 31. Cressonii, surface deeply 

 grooved, without the usual mesial ridge above, which is present in 31. 

 Cressonii ; rings black, except the hind margin of the 2d ring; tip not 

 so hirsute as usual, supra'anal area better marked and more coarsely 

 punctured than in the other species. 



Length, .36 inch. Maine, (Coll. Harris). 



Differs from 31. Cressonii by the two basal rings of the body of the 

 abdomen being red only on the hind margin, by its deeply furrowed 

 and broad pedicel, the slender antennae, and the coarser striation of the 

 propodeum. 



Mimesa denticulata, n. sp. 



% . Head much as in 31. Cressonii ; ocelli placed in a higher trian- 

 gle, surface of vertex much the same, but more distinctly puncto- 

 striated ; front densely silvery, a little longer than in 31. Cressonii. 

 Mandibles black, reddish at tip; antennae more clavate towards tip 

 than in 31. Cressonii, tip much thickened; scape black, flagellum en- 

 tirely pale red, darker above except on basal joint beneath, 2 — 6 joints 

 slightly produced tooth-like beneath. Thorax much as in 31. Cres- 

 sonii, flanks striated, densely silvery hirsute ; polished and thinly 

 punctured. Propodeum with enclosure distinct, finely striated, about 

 six ridges on each side of the mesial furrow, which is small but dis- 

 tinct, lozenge-shaped ; posteriorly with fine diverging striae on each side 

 of the broad and deeply channelled mesial furrow, posteriorly silvery 

 hirsute; tegulse testaceous; pterostigma ferruginous, nervures darker. 

 Femora black sericeous, fore and middle pair tipped with paler reddish; 

 fore tibia: pale reddish, middle pair darker, sericeous, hind pair broadly 

 fuscous at base, and narrowly so at tip ; tarsi darker, posterior pair 

 darker, joints tipped with fuscous; flanks thinly pubescent. Body of 

 abdomen nearly twice as long as head and thorax together, unusually 

 long and slender, narrow oval-lanceolate, smooth and polished, becom- 





