194 WILLIAM J. FOX. 



notum a subangulav appearance, at the sides anteriorly; clorsulum more strongly 

 pnnctnred than the front ; enclosure of middle segment strongly marked, the 

 medial impressed line broadened basally, within the enclosure smooth except the 

 foveolated base, between it and sides of middle segment rugose, posterior face 

 rugose toward apex, lateral ridges tolerably distinct and bordered outwardly by 

 a strong furrow ; first joiut of anterior tarsi greatly flattened, twisted, bent in 

 the middle: wings subbyaline, iridescent, nervures and stigma brownish, recur- 

 rent vein received by the submarginal cell beyond the middle ; abdomen micro- 

 scopically punctured, the apical segments most distinctly. Black ; fore and medial 

 femora yellowish testaceous, darker above and toward apex, their tibipe and tarsi 

 yellow, the former with a dark testaceous stripe on outer side, trochanters yel- 

 lowish, hind tibiiB at base and their tarsi basally, pale yellow; apical margins of 

 abdominal segments narrowly and obscurely testaceous; clypeus, front, cheeks 

 with dense silvery pubescence, which is also present on vertex and thorax in a 

 lesser degree, the thorax beneath and fore femora with long, pale pubescence. 

 Length 6 mm. 



New Yoi'k. One specimen. Easily distinguished by the entirely 

 black thorax, shape of tirst joint of fore tarsi and pale pubescence 

 on fore femora. 



19. Group (f'ter. 

 Cielocrabro Thomson, is apparently represented in America by the 

 species of this group. The first abdominal segment inclines slightly 

 to subpetiolate, being longer and narrower than the second ; the 

 pygidial area is triangular, narrowed and strongly excavated api- 

 cally ; ocelli in an equilateral triangle ; recurrent nervure generally 

 received by the marginal cell a little beyond the middle, although 

 sometimes received more toward the base ; pronotum rounded later- 

 ally. The males appear difficult to sejiarate from those of the 

 mimirvus group, but the pronotum in that grouj) is crested, and the 

 last segment of abdomen is more strongly punctured than the pre- 

 ceding one, while in this group the last two segments are punctured 

 about the same. 



81. Crabro iinprossifVoiis Sm. 



Crabro fihialis Say (nee Fain-.), Long's Second Exp.. Ajipeudix, p. 340. 



Crabro imprensifrons Smith, Cat. Hym. Brit. Mus., iv, 417.. 



Ble/iharipus irnpressifrons Packard, 1. c, vi, p. 374, 9 • 



Blephuripiis ncufellatus Packard, (non Say), ibid. p. 375. 'J, . 

 9 . — Clypeus distinctly carinated, the anterior margin with the medial pro- 

 duced portion truncate; head very finely punctured, the front most strongly; 

 space between the hind ocelli somewhat less than that between them and the 

 nearest eye-margin, all three forming a tolerably low triangle; frontal depression 

 deep, glabrous, the impressed line extending to fore ocellus also deep ; first joiut 

 of flagellum scarcely oue-quarter longer than the second ; dorsulum more dis- 

 tinctly punctured than the vertex ; pronotum a])parently im])unctate, not trans- 



