NO. 2173. A REVISION OF THE BEMBICINE WASPS— PARKER. 9 7 



sides of thorax and median segment. The middle femora are finely 

 but not deeply serrate. The second sternite bears a large, prominent, 

 hook-like process, of which the backwardly directed distal prolonga- 

 tion, ending in a sharp point, is relatively greater than that of any 

 other species herein described. The sixth bears a pointed, narrow, 

 triangular process whose ventral surface is slightly concave longi- 

 tudinally. 



Female. — Black: Labrum, mandibles except apices, clypeus, scape 

 below, frons between antennae, broad anterior orbits shortened and 

 deflected inward above, spot before anterior ocellus, narrow posterior 

 orbits, posterior border of pronotum, sides of prothorax except irregu- 

 lar spot in front of tubercles, lateral lines and pair of discal lines on 

 scutum, lateral spots on scutellum, spot on sides of median segment, 

 spot on metapleurae, irregular spot on mesopleurae, fasciae on tergites 

 1-5, first widely interrupted, remainder very narrowly interrupted, 

 second imperfectly inclosmg a pair of dorsal black spots, remainder 

 with a pair of broad, shallow, anterior, dorsal emarginations, apex 

 of sixth tergite, lateral spots on sternites 2-5, spot on anterior and 

 middle coxae, femora except basally and upper surface of anterior 

 pair, tibiae except stripe above and below on anterior and middle 

 pairs, and tarsi, yellow. 



Length. — 14 mm. 



The flagellum is light below, more so than in the male, and the 

 pubescence is similar to that on the male. The wings in both sexes 

 are hyaline and the sculpturing is of the normal character. On the 

 female and on one male the fasciae on the tergites are very nan-owly 

 interrupted, appearing for the most part as if developed in lateral 

 halves that have just failed of uniting on the dorsal midline. 



This species in the pattern and color of its maculations resembles 

 very closely B. troglodytes Handlirsch, from which the male of tliis 

 species can be readily distinguished by the presence of the serrate 

 middle femora and spinose antennae. The female is distinguished 

 from troglodytes by the absence of any black on the clypeus and by the 

 absence of maculations on the metanotum and dorsum of median 

 segment. The male differs from spinolae, similans, and cameroni in 

 the character of the process on the second sternite, the spinose seg- 

 ments of the antennae and the form of the genital stipes. From the 

 females of these three species the female of this one differs in the 

 character of the maculations. Fox referred the males of this species 

 to sayi Cresson, and it was doubtless on these same specimens that he 

 based his description of the male of that species. 



Described from two males and one female. 



Habitat. — Illinois. 



Type. — Male and paratypes in collection of the American Ento- 

 mological Society of Philadelphia, Pennsylvania. 

 65008°— Proc.N.M.vol.52— 17 7 



