INSKCUTOR INSCITI^ MENSTRUUS 15 



was associated. This name can only be identified by further 

 collecting. It is probably not the same as increpitus, although 

 the possibility is open. 



The larva of increpitus has a short tube and frequents river 

 valleys, like sfimulans, but the genitalia differ. The color of 

 the mesonotum is dark with gray scales at the angles, not yel- 

 low ; but the character is not diagnostic. 



In the Yosemite Valley, in May, I found increpitus in vast 

 numbers. The larvae were not only in the river pools, but oc- 

 curred in woodland pools; everything in the valley was full 

 of them. The adults were out and males were seen swarming. 

 At Fallen Leaf Lake, the species was breeding in wave pools be- 

 hind gravel beaches at the northern or outlet end of the lake, 

 in artificial holes over a supply pipe, and in a grassy pool in a 

 meadow close at hand. At Clio, in the Feather River valley, 

 adults were still flying in July. I also got adults in August at 

 Tahoe Tavern at Lake Tahoe. The water in these river and 

 wave pools, frequented by this species, is dilute. The river 

 pools often have a current, while the lake pools are connected 

 by seepage with the lake itself. The larvse come early, but 

 are of slower development than the black-legged species, and 

 can be found through June. Both males and females can be 

 caught till late in the summer. 



Specimens before me, referable to increpitus, have been taken 

 as follows : Yosemite Valley, California, May 14 to June 13, 

 1916 (H. G. Dyar) ; Little Yosemite Valley, California, May 

 23 to 28, 1916 (H. G. Dyar) ; Fallen Leaf Lake, Lake Tahoe, 

 California, May 28 to June 24, 1916 (H. G. Dyar); Tallac, 

 Lake Tahoe, CaHfornia, June 17, 1916 (H. G. Dyar); Glen- 

 brook, Nevada, August 25, 1915 (H. G. Dyar) ; Tahoe Tavern, 

 Lake Tahoe, California, June 20, 1915 (A. K. Fisher), Aug- 

 ust 15, 1915 (H. G. Dyar) ; Clio, Feather River, California, 

 July 9 to 23, 1916 (H. G. Dyar) ; Pacific Grove, California, 

 July 2, 1903 (Isabel McCracken) ; Eureka, California, May 6 

 to July 6, 1903 (H. S. Barber) ; Fieldbrook, California, May 

 26, 1903 (H. S. Barber). 



The last three localities are in the coast region of California 



