42G NEW SPECIES OF HYMENOPTERA 



Type, a female taken at Ute Creek, Colorado, August 7, 1907, 

 (R. W. Dawson). 



Closely related to megacephalus Rohwer, but differs in the 

 sculpture of the propodeum, puncturation of the ventral segments 

 and other minor characters. In having the propodeum marked 

 with yellow it is similar to higeminus Patton, but differs in the 

 markings on the abdomen and in the coloration of the femora. 



Crabro (Xestocrabro) proletarius sp. nov. 



(f. Length 5.5 mm. Clypeus truncate medially, with a small lateral 

 tooth; facial basin smooth, distinctly margined above; head with very fine, 

 shallow, well separated punctures; line running from anterior ocellus faint but 

 distinct; ocelli in a low triangle, the distance between the two posterior ones 

 slightly less than the distance between them and the nearest eye margins; 

 first joint of flagellum about one-fourth longer than the second, the first four 

 joints more or less emarginate basally, beneath, and somewhat produced at 

 the tip; clypeus and lower orbits covered with dense silvery pubescence, 

 remainder of head with very fine, sparse, silvery pubescence, pronotum mar- 

 gined anteriorly and posteriorly forming a transverse furrow, broken medially 

 by a shallow emargination; not at all dentate laterally; mesoscutum closely, 

 confluently punctate giving it the appearance of being finely, transversely 

 striato -punctate anteriorly and finely, longitudinally striato-punctate poste- 

 riorly; mesoscutellum longitudinally striato-punctate; episterna transversely 

 striate above, transversely striato-punctate below; mesosternum with fine, 

 well separated punctures; propodeum above shallowly reticulate, with a shal- 

 low, slightly foveolate channel medially; a row of rather large, shallow foveae 

 between the upper surface and the posterior face of the propodeum, the latter 

 rather strongly, transversely striate and channelled medially; sides of propo- 

 deum moderately, transversely striate; abdomen apparently impunctate, the 

 first tergite more or less microscopically punctate; fore femora produced be- 

 neath at the base; fore tarsi very much flattened; first joint of internunliate 

 tarsi not angulate, very slightly longer than the following three joints united. 

 Color black; small spot on the mandibles, scape (except at the base in front 

 and extending upward on the inner side, black), band on the pronotum above, 

 widely interrupted medially, posterior lobes of the pronotum, metanotum, 

 lateral spots basally on tergites two to five (those on tergite two the largest), 

 basal band on tergite six somewhat narrowed medially, fore femora at the tip 

 and a stripe in front and on outer side, intermediate femora on the apical fourth, 

 front and intermediate tibiae except a spot within, hind tibiae except a spot 

 within at the apex, and first two joints of anterior tarsi, all yellow; anterior 

 femora behind, and spot on anterior tibiae within, reddish; wings subhyaline, 

 veins and stigma dark testaceous. 

 9 . Unknown. 



Type, a male collected at Lisbon, North Dakota, June 5, 1913, 

 on Zizia aurea, (O. A. Stevens). 



