62 CALIFORNIA ACADEMY OF SCIENCES. [Proc. 3D Ser. 



Female. Length '2 mm.; length of wing 2.5 mm. The third antennal 

 joint is distinctly shorter and blunter, but the face seems to be no broader 

 than in the male. Middle legs plain, resembling the hind legs in spinulation. 

 In my specimens the basal half of all the femora is black and the yellow on 

 the other portions of the legs is more brownish. 



This species was taken in considerable numbers in the 

 rank grass near water at the following localities in Wyo- 

 ming during August and September, 1895: Natrona Co., 

 Wind River Mts., Two-gwo-te-ee Pass. It was most com- 

 mon in the last locality. 



62. Campsicnemus claudicans Loe-w. 

 Plate IV, Fig. 113. 



Three males and three females collected by Professor 

 J. M. Aldrich on Craig's Mt., Idaho, agree very closely with 

 Loew's description of this species. His specimens were 

 from Sitka, Alaska, but the mountain fauna of Idaho, Wyo- 

 ming and Dakota undoubtedly comprises several boreal 

 forms, so that the occurrence of C . claudicans within the 

 confines of the United States need not surprise us. The 

 male of C . claudicans resembles C. Thersites and C . Philoc- 

 tetes. It may be distinguished from the latter by the 

 absence of the knob-shaped process and the longer series 

 of short black spines on the middle tibia; from the former 

 it differs in having the middle metatarsus nearly straight 

 and terminating in a shorter point. It differs from both in 

 having a distinct black spot on the distal segment of the 

 fourth vein. 



Hydrophorus Fallen. 



The species of Hydrophorus described by former writers 

 and the five new forms here added probably represent only 

 a small fragment of our species of this genus. In distin- 

 guishing the species, which are by no means rich in plastic 

 characters, I have relied mainly on the spinulation of the 

 fore femur and tibia in the male, as the venation of the 

 wings is very rigid and uniform and the antennae and face 

 rarely offer available characters. I have excluded from the 



