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



tlier toward the margin of the wing than the end of the radial cell. 

 The angle formed by this vein and the radial vein and opening toward 

 the apical border of the whig is acute. The second discoidal cross 

 vem on its anterior third is strongly bent toward the apical border of 

 the wing but is not angular and does not subtend a short vein. The 

 first submedian cell, which terminates near the origin of the basal 

 vein, is scarcely longer than the second, which gradually increases in 

 breadth toward its distal end. The basal vein joms the subcosta at a 

 distance from the radial cell equal at least to the length of that cell. 



The hind wing. The retinaculum consists of a row of small hook- 

 lets beginning near the origin of the radial vein and extending toward 

 the apex of the wing. The median cell is greatly prolonged, reaching 

 almost to the apical border of the wing toward which two short veins 

 extend from the end of the cell. The submedian cell ends anterior 

 to or at the origin of the cubital vein. The liinder angle of the sub- 

 median cell, foiTaed by the junction of the submedial and submedial 

 cross veins, is obtuse. 



The legs are relatively long and slender. The middle coxae are 

 shghtly separated from one another and the middle femora are never 

 toothed, serrate, or dentate on species thus far discovered. The 

 tibiae and tarsi are provided with more or less well-developed spines. 

 The anterior tarsi of the female are provided with combs, consisting 

 of long spines, of which seven are present on the metatarsus and two on 

 each of the tliree following segments. These tarsal combs are weakly 

 developed on the males and those males having the middle tibiae 

 dilated lack the combs altogether. In the case of the males of the 

 two species that have the middle tibiae dilated the middle metatarsus 

 is somewhat curved and the distal half is flattened and thin. The 

 claws are slender and the pulvilli are well developed. 



The sculpturing is line, close, and uniform, and affords little ground 

 for the distinguishing of species. The pubescence is more prominent 

 on some species than on others, is better developed on the male than 

 on the female and is most conspicuous in all cases on the head, thorax, 

 median segment, and base of abdomen. The maculations consist of 

 spots, stripes, and lines on the head, thorax, and median segment, 

 and of bands, continuous or broken, on the segments of the abdomen. 

 The color of the maculations varies among the species from bright 

 yellow to nearly clear white. 



Steniolia is distinguished from nearly related genera as follows: 

 From all by the unusual length of the proboscis; also from i^ic^r^es by 

 the form of the median segment, the number of segments in the palpi, 

 the character of the ocellar cicatrices, the apical narrowing of the 

 radial cell, and the form of the eighth sternite of the male; from 

 Stidia by the number of segments in the palpi and the apical narrow- 

 ing of the radial cell; from Bemhix by the character of the ocellar 



