no. 2173. A REVISION OF THE BEMBICINE WASPS— PARKER. 63 



viewed with light at proper angle; wings somewhat infumated; eyes 

 divergent at vertex. Punctures of dorsal surface fine, close and even, 

 those of median segment somewhat larger; punctures of mesopleurae 

 and dorsal surface of last abdominal segment coarser and not so 

 closely and evenly distributed. Joints 7-9 of flagellum prominently 

 rounded out below; intermediate femur with a prominent tooth pos- 

 teriorly at base; hind tibia with a carina on inner side of distal half. 



Female. — In coloration and general appearance similar to the male 

 with such exceptions as are pointed out below. The ultimate tergite 

 is devoid of all traces of lateral ridges or of a pygidial area; on the 

 ultimate sternite there is a median longitudinal carina. 



Length. — 10-16 mm. 



This is the most widely distributed species in the United States. 

 The color of the markings varies from deep intense orange-yellow, 

 through lighter shades of yellow to light creamy white, and this 

 variation in color is true for both sexes. There is great variation 

 also in the extent of the markings. In the female usually the greater 

 part of the clypeus is yellow, but in many specimens it is reduced to 

 a small area near the base. In some specimens the yellow covers 

 almost the entire clypeus, but even in such cases the apical margin 

 is black. In the male the clypeus is usually black but in many speci- 

 mens there are two small yellow spots basally and in others only one, 

 which varies in extent. In the male I found the labrum invariably 

 black; among the many females examined only four showed any 

 trace of yellow on the labrum. The coxae, trochanters, and the 

 greater part (basal) of the femora are black. The color of the tibiae 

 and tarsi varies greatly, showing shades varying from yellow through 

 ferruginous to almost black in a few specimens. The scutum is 

 unmarked except that in some individuals there is a short line at the 

 posterior lateral borders. Two females show on the dorsal surface 

 of the median segment small yellow spots suggesting a suppressed 

 curved line thereon. The fasciae on the tergites vary somewhat in 

 width and on 3, 4, and 5 may be interrupted laterally; in the males 

 this is frequently true for tergites 3, 4, 5, and 6. On the first tergite 

 the fascia may be much reduced or wholly lacking, especially in the 

 male. The lateral spots on sternites 2-5 in the female and 2-6 in 

 the male may or may not be joined by faint yellowish apical bands. 



Habitat. — Georgia, North Carolina, Virginia, Tennessee, Pennsyl- 

 vania, New Jersey, New York, Connecticut, Massachusetts, Maine, 

 Canada, Indiana, Michigan, Illinois, Wisconsin, Colorado, Wash- 

 ington, Oregon, California, and Texas. 



Number of specimens examined — Males, 107; females, 126. 



