182 CALIFORNIA ACADEMY OF SCIENCES [Proc. 4th Ser. 



base of antennae about as wide as third antennal segment, nar- 

 rowed below ; face concave in profile ; vibrissal angle not pro- 

 truded beyond line of base of antennae ; some short setulae above 

 vibrissa? ; cheek over twice as high as widest part of parafacial ; 

 arista minutely pubescent. Presutural acrostichals long, two- 

 rowed ; postsutural dorso-centrals 4. Abdomen cylindrical, hypo- 

 pygium of moderate size ; fifth tergite linear, sixth with a number 

 of long bristly hairs ; fifth sternite with a moderately deep U- 

 shaped incision. Hairs on legs rather long for this genus ; hind 

 femur with some long bristles on apical half of anteroventral 

 surface, and some shorter bristles on basal half of posteroventral ; 

 hind tibia with two or three anterodorsal and anteroventral bristles 

 and an outstanding setula at middle on posterior surface. Calyp- 

 trae small. Veins three and four slightly divergent apically ; 

 costal setulae rather long. 



Female: Differs in color from the male in having orbits 

 parafacials and cheeks brownish pruinescent, the thorax densely 

 brownish pruinescent and with three broad, subcontiguous 

 fuscous vittae. Legs as in male, but there are a number of 

 short posterodorsal setulae on hind tibiae. 



Holotype, male, No. 818, allotype, female, No. 819, Mus. 

 Calif. Acad. Sci. These and one female paratype from the type 

 locality, collected by G. Dallas Hanna, August 10, 1920. One 

 male paratype from the type locality collected July 12, 1920. 



Type locality, St. Paul Island, Alaska. 



One male, in poor condition, was collected by Dr. Hanna 

 on St. George Island, June 30, 1920. 



7. Hydrophoria alaskensis Malloch 



Of this recently described species, the types of which came 

 from the Pribilof Islands, there are two specimens in the collec- 

 tion. St. Paul Island, June 21, 1920. 



