INSECUTOR INSClTi;^ Ml^NSTRUUS ' 17 



mite Valley. The species is distributed over Europe and North 

 America, being indigenous to both continents. Along the At- 

 lantic seaboard it is one of the commonest species, especially 

 toward the north, breeding in temporary woodland and road- 

 side pools. Of the Yosemite specimens, one was caught May 

 14, 1916, the other bred from a woodland pool May 22, 1916, 

 where it was associated with the ubiquitous increpitus. 



Aedes cinereus Meigen (fuscus Osten Sacken). 



This species also is common to Europe and America and, in 

 the east, breeds in temporary woodland pools. In Yosemite 

 it was bred from valley pools with increpitus and at Fallen Leaf 

 from wave pools with the same association. It is thus a river 

 valley species in the west. Previous records of this species 

 from California are lacking, the westernmost record being 

 Kaslo, British Columbia. 



The adult has the mesonotum golden brown with traces of 

 two darker lines; abdominal bands narrow, but widening at the 

 sides to form a white lateral line. The legs are without sprink- 

 ling of white scales ; the male has short palpi. 



Aedes cataphylla Dyar. 



A very characteristic species, with the thoracic and abdomi- 

 nal marking of increpitus, but with wholly black tarsi. The 

 wing scaling also is peculiar. The eggs are much thicker than 

 those of any other species in the Sierras. The male, larvae, 

 and life history are unknown. 



This is the second earliest species to appear on the wing. 

 When I arrived at Fallen Leaf Lodge, May 25, 1916, no mos- 

 quitoes were flying except overwintering specimens of Culiseta. 

 The first adult of the spring emergence was seen June 2, a 

 specimen of ventrovittis. On June 4 cataphylla was out in 

 numbers, mixed with a few tahoensis, and they continued to be 

 taken till June 24, when I made my last catch at the lake. 



Specimens before me, referable to cataphylla, were taken 

 as follows: Fallen Leaf Lake, Lake Tahoe. California, June 

 4 to 24, 1916 (H. G. Dyar) ; Lily Lake, Lake Tahoe, Califor- 

 nia, June 16, 1916 (H. G. Dyar) ; Glenbrook, Nevada, June 5, 

 1916 (H. G. Dyar). 



