492 PROCEEDINGS OF THE ACADEMY OF [1893. 



$ . — Anterior margin of clypeus rounded-out, indistinctly biden- 

 tate laterally; front and vertex sculptured similarly to the 9 ; space 

 between eyes at top a little less than the length of antennal joints 2 

 and 3 united; first joint of flagellum fully one- third shorter than 

 the second ; dorsulum more compactly punctured than in the 9 '■> 

 scutellum impressed , legs feebly spinose ; colored like the 9; front, 

 face, clypeus densely and the thorax very sparsely, clothed with 

 silvery pubescence; abdomen with a silvery pile. Length 8-12 mm. 



Var. 9 $ . First two, sometimes three, segments of abdomen 

 bright red. 



Occurs from Canada (Harrington) to Florida, westward to Mon- 

 tana. From the latter locality I have only seen the black and red 

 variety. The female of this species is what we have heretofore called 

 Larra pensylvanica Bve., but an examination of Beauvois' figure of 

 this latter species invalidates that supposition; pensylvanica is prob- 

 ably a Tachysphex. 



4.~Ancistromma dolosa n. sp. 



9 . — Anterior margin of clypeus emarginate medially, bidentate 

 laterallv, the outer tooth representing the lateral angles and is by far 

 the largest; front finely and closely punctured; vertex even more 

 finely and closely punctured than the front; space between the eyes 

 at the top about equal to the length of antennal joints 2 and 3 united, 

 if anything it is slightly less; antenme much shorter than the head 

 and thorax united, the first joint of flagellum, if anything a little 

 longer than the second; dorsulum with fine, rather sparse punctures; 

 scutellum impressed (?); metathorax striated, most strongly so on 

 posterior face, the upper surface with the striations irregular and im- 

 pressed medially; legs tolerably spinose; pygidial area strongly and 

 sparsely punctured, about twice as long as it is broad at the base. 

 Black; abdomen bright red ; tarsi testaceous; wings dark fuscous, 

 iridescent, nervures black ; marginal cell apically, separated from 

 the anterior margin of the wing; head, thorax and abdomen entirely 

 destitute of pubescence or pile. Length 13 mm. 



California (Coll. AsJimead). Resembles very much Tachysphex 

 triquetrus, but the form of the ocelli and short, stiff tarsal-comb will 

 at once separate it from that species. 



