234 CALIFORNIA ACADEMY OF SCIENCES [Proc. 4th Se». 



scutellar pile long and up-curved; thorax with long, black erect pile; 

 pleura light brownish pollinose, the three long tufts of black pile curled at 

 the tip ; halteres brown with a yellowish knob. 



Abdomen shining black, almost bare of pile above; long black pile on 

 the sides of the abdomen arranged in tufts; pile of venter long and black; 

 the white pollinose fasciae on the posterior margins of the second, third, 

 fourth and fifth segments widely interrupted in the middle; genitalia much 

 larger than the last segment, black, with black pile. 



Femora and knees black; coxae and basal half of femora beneath long 

 golden yellow pilose ; tibiae and tarsi brownish red, the last tarsal segment 

 and most of the preceding one black ; pulvilli white, the claws black ; pile 

 of apical half of femora, pile and spines of tibiae and tarsi black; tarsi 

 not ornamented except for short silvery pile beneath on hind pair; front 

 tarsi much longer than the others, the first two joints as long as the entire 

 middle tarsi. Wings grayish hyaline ; a narrow brown cloud runs from end 

 of first vein along base of third to anterior cross-vein and along cross-veins 

 closing discal, fourth and fifth posterior cells ; a pale cloud on veins at 

 distal end of discal cell ; anterior cross-vein a little distad of end of first 

 vein, near base of discal cell. 



Female : Very similar to male. There is some white pile on face beneath 

 antennas and some, mixed with black pile, on femora; front tarsi much 

 shorter and heavier than in male, about same length as others ; no silvery 

 pile beneath on hind tarsi ; pile of the hind tibiae white above and black 

 below ; some white pile above on middle tibiae ; the interrupted pollinose 

 fasciae much wider and with white pile on them ; rest of pile on abdomen 

 black, except at posterior angles of first segment, and much shorter and 

 thinner than in male, decreasing in length toward the tip. 



Holotype (No. 484), male, collected at Hood River, Oregon, 

 May 15, 1917 (F. R. Cole), and allotype (No. 485). female, 

 taken by the senior author at the same place May 29, 1917, in 

 the Museum of the California Academy of Sciences. 



Paratypes in the author's collection, taken at Hood River, 

 Oregon, in June. 



This species is in the group having the third antennal joint 

 red and with a convex, shining scutellum. It would run to 

 aurifex in Back's table of species, given in his Monograph, but 

 has no fulvous hair on the abdomen ; the tibise are all red, etc. 



20. Cyrtopogon princeps O. S. 



The holotype is a single male from Webber Lake, Sierra 

 Nevada Mts., California. Back, in his Monograph, mentions 

 no other specimens. The description of the female is therefore 

 given. 



Female : _ Length about 12.5 mm. The frons and face with gray bloom, 

 the pile as in male ; thorax mostly brownish, the markings not distinct but 

 outlined posteriorly with whitish bloom. 



Abdomen polished black but the polhnose cross-bands differ. Segments 

 two to five with the usual posterior cross-bands of gray-white pollen. 

 Scarcely any pile on abdomen except on the basal two segments. 



