NORTH AMERICAN HYMENOPTERA. 191 



nent, while that on the cheeks is indistinct ; impressed line extending from frontal 

 depression to the fore ocellus deep; autennfe tolerably slender, the flagellum not 

 at all clavate, its first joint scarcely one-quarter longer than the second ; pronotum 

 strongly crested above, the lateral angles obtuse ; dorsulum punctured about like 

 the vertex, strongly convex : mesopleurge more distinctly punctured, its episternal 

 suture rather distinctly angulated a little above the middle; base of middle seg- 

 ment with a transverse, foveolated furrow, the impressed lines forming the en- 

 closure distinct, as is also the lougitudinal, medial line; posterior face divided by 

 a deep and broad, longitudinal channel, not rougheued, lateral ridges becoming 

 obsolete above; medial and hind tibise not strongly spinose ; abdomen somewhat 

 longer than head and thorax united, microscopically punctured above, impunctate 

 beneath, the first segment decidedly narrowed basally, tending a little in form to 

 subpetiolate ; pygidum with coarse, scattered punctures. Black; mandibles and 

 tegulse testaceous ; scape in front, a continuous stripe on pronotum and tubercles, 

 scutellum, tips of fore and medial femora, medial and anterior tibife except a line 

 on inner side ; basal third of hind tibiae and two first joints of the tarsi, yellow- 

 ish ; wings hyaline, iridescent, nervures and stigma brownish ; clypeus, inner 

 orhits, cheeks and sides of thorax sparsely, with silvery pubescence. Length 6 mm. 



Pennsylvania (Say) ; Colorado. The specimen before me agrees 

 tolerably well with Say's description, particularly regarding the yel- 

 low of pronotum, which is connected with that of the tubercles. I 

 should think, however, that this is apt to vary. 



76. Crabro siinilis n. sp. 



9 . — Anterior margin of clypeus truncate medially, very slightly or not at all 

 dentate laterally ; head finely punctured, the front and vertex more closely so 

 than the region behind the ocelli ; depression extending upward from frontal de- 

 pression not strongly marked, almost obliterated before the anterior ocellus ; space 

 between hind ocelli decidedly less than that between them and the nearest eye- 

 margin ; first joint of flagellum somewhat more than one-quarter longer than the 

 second ; pronot\im with the crest not very pronounced, at the sides obtusely an- 

 gular ; dorsulum punctured like the vertex ; episternal suture of mesopleurge a 

 little sinuous ; enclosure of middle segment well marked, the lines or furrows 

 forming it well marked and foveolate, as is likewise the longitudinal furrow 

 dividing the enclosure, this furrow is also broadened basally, two convexities of 

 enclosure very finely and obliquely striated, posterior face apparently finely and 

 transversely rugose ; abdomen a little shorter than head and thorax united ; py- 

 gidium broad, flat, with large, separated punctures, lilack ; mandibles except 

 apex, and the tarsi yellow; clypeus, anteunte entirely, strij>e on pronotum ex- 

 tending to and including the tubercles, tegulge, scutellum, metanotum (postscu- 

 tellum) and legs, except tarsi, which are colored as mentioned above, and hind 

 femora and tibiae, which are somewhat marked with blackish, fulvous ; apical 

 margins of abdominal segments broadly, pale testaceous; clypeus, inner orbits, 

 cheeks and thorax on sides beneath, more or less with silvery pubescence ; ab- 

 domen with a silvery sericeous pile. lieugth 5.5 mm. 



Jacksonville, Florida (Ashmead). Has the facies of C. imprem- 

 frons. The color markings will distinguish it from the other species 

 of this grou]). 



TRANS. AM. ENT. SOC. XXII. JUNE. 1895. 



