NORTH AMERICAN HYMENOPTERA. 207 



100. Crabro coliiinbiauiis Kohl. 



Crabro {Lindenius) culivmhiuiuis Kohl, Ami. k. k. Xaturh. Hofm. Wieii, vii, 

 203. 

 " Black, head a little bronzed. Mandibles, scape of antennae, interrupted line 

 on collar, humeral tubercle, spot on tubercles and greater part of legs, yellow. 

 Punctuation of head and thorax much denser than in Or. pygmasus R., and Or. 

 algira and frontal line deeper. Foveolated suture of episternum mesopleuralis 

 feebler than in Or. pygmxns. Cordiform area of middle segment large, shining, 

 divided into two parts by a longitudinally narrow median line, crenate at base, 

 on sides and posteriorly not divided by a crenulated fossa. Length 5 mm. 9 •" 



"To ray knowledge no Crabro of the group Lindenius has been 

 described from the nearctic region ; neither could I refer none from 

 the described black bodied species of Crabro to the group Lhideiims, 

 so it almost seemed, as though this group were not represented in 

 America. At the present time, however, a female specimen of a 

 species from British Columbia (Revelstoke) lies before me. It re- 

 sembles very much a small specimen of L. pijcpnwus from the Med- 

 iterranean region in respect to size and coloration, and indeed that 

 variation, in which, besides the yellow humeral tubercles, there is 

 also a narrow interrupted band on the collar in the middle, and a 

 spot upon the scutelluni of the same color. The color of the legs is 

 as in pygmceus, namely the tips of the knees citron-yellow, the entire 

 anterior part of the fore and middle tibiae, the basal half of hind 

 tibiffi and the metatarsus of all pairs. The remaining tarsal joints 

 brown. Flagellum beneath rust-color. The black of the head 

 shows that brassy lustre of the Lindenim group, but only to a slight 

 degree. From pygmceus, eolumbianus is distinguished principally by 

 the deeper frontal line, by the much closer, though fully as fine, 

 punctuation of the head and thorax — in pygma'us these parts are 

 somewhat sparsely, punctured — further by the more subtile fove?e of 

 the episternal furrow of the mesopleurae. The cordiform area is 

 large and smooth, j^arted longitudinally by a fine medial line, on the 

 base furnished with longitudinal wrinkles, which, contiguous to the 

 postscutellum, show a transverse series of irregular fovese. From 

 the posterior part of middle segment and from its sides — at all events 

 in distinction from pygmceus — the boundary of the cordiform area is 

 not very sharply defined, about as in Cr. (L.) (egira Kohl. Pygidium 

 punctured, apically rust-red." 



101. Crabro rtigosopunctatus Prov. 



Thyreopn.s rmjosopunctatus Provancher, Hym. Quebec, p. 664, 9 • 

 Orabro rugosopunctatus Kohl, Zool. .Tahrb., Abth. f. Syst. iii. 

 " 9 • — Length .30 inch. Black, strongly punctured ; the tubercles yellow, 



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



