464 AMERICAN HYMENOPTERA. 



bama (a single male). Robertson has reported it from Illi- 

 nois, Swenk from Nebraska (Lincoln, Ashland, Seward and 

 West Point) and Cockerell from New Mexico (Tuerto 

 Mountains— 8200 feet altitude). 



This species seems to have its closest allies in P. insiilaris 

 Cresson and P. constcltus, though P. laboriosus appears to be 

 about as closely related. 



Psitliyrus crawfordi new species. 

 Types. — Described from one female and one male, the 

 former from Placer County, California, and the latter from 

 Oregon, both deposited in the collection of the United States 

 National Museum. 



Both sexes with a tuft of yellow pile above the bases of the a7itentice afid 

 with a triangular patch of pile of the same color on the occiput ; thorax 

 with the dorsum yellow in front, but otherwise mostly dark ; abdomen 

 with yellow pile on the sides of a portion of the apical half of the dorsum, 

 otherwise dark. 



Female. Head. — Face with a conspicuous yellow tuft above the 

 bases of the antennae and with a few yellow hairs mixed with the black 

 in the middle just below them. Occiput with a large triangular patch 

 of pure yellow pile. Otherwise mostly dark. Malar space distinctly 

 shorter than its width at the apex, about one-fourth as long as the 

 eye. Third and fifth antennal segments subequal in length, the fourth 

 distinctly shorter than either. 



Thorax. — Dorsum with its anterior portion covered with yellow pile 

 back to the bases of the wings, the remainder being black. The disc 

 only thinly clothed. Mesopleura with their anterior portions bearing 

 yellow pile for some distance below the bases of the fore wings, but 

 their hind and lower portions dark. Metapleura and sides of the me- 

 dian segment dark. 



A bdomeft .—Dorsum : segments one and two black ; segment three 

 dark, with yellow pile on the posterior corners ; segment four dark in 

 the middle, with yellow pile on the sides and extending well toward 

 the middle line of the body along the hind margin ; segment five 

 dark, with yellow pile on each side ; segment six dark, with brownish- 

 ferruginous pubescence about the apex. Venter dark, the apical por- 

 tion of the hypopygium bearing considerable brownish-ferruginous 

 pubescence ; the ridge-like posterior portions of the lateral elevations of 

 the hypopygium much more prominent than those of the other species 

 of this group, more nearly equalling the rounded anterior portions in 

 height and being, in fact, but little lower than those portions. 



Wings. — Only moderately stained with brown, the fore pair being 

 slightly the darkest in the region beyond the veins. 



