20 INSECUTOR INSClTi;!<; MUNSTRUUS 



pear in 1916 until July, which may be the reason why I missed 

 this species entirely, as I left the mountains before then. 



Culiseta inornatus Williston. 



This species is typical of the low country and strays only 

 sparingly into the mountains. It is abundant in Nevada in the 

 valleys at the foot of the mountains surrounding Lake Tahoe ; 

 specimens were taken in the mouth of Kingsbury Canyon. It 

 was found breeding in muddy pools in a cow pasture near Glen- 

 brook on the Nevada side of Lake Tahoe. This side has a more 

 arid character than the California side, more resembling the 

 sagebrush plains, with their irrigation pools, so favorable to 

 inornatus. 



Culiseta incidens Thomson. 



Equally at home everywhere in the west, in the plains and 

 mountains, breeding in any enclosed water from rain-barrels to 

 mountain springs. Hibernated adults are the first mosquitoes 

 seen in the spring, and breeding begins early. I found pupse 

 already in May, 1916, in the Yosemite Valley, while many 

 Aides increpitus were no further advanced. At Gold Lake the 

 larvae were in vast numbers in all stages, together with egg- 

 boats, but many already \ti the last stage, in a marsh only re- 

 cently vacated by A'edes hexodontiis, on July 20, 1916. 



The species breeds all summer. I found them in an ice-cold 

 mountain spring at Fallen Leaf, in August, 1915, where they 

 were preyed upon by Bucorethra larvae: In May-June, 1916, 

 they were again in the same spring, again preyed upon by 

 Bucorethra. 



Culiseta impatiens Walker. 



This species was caught at Yosemite, Fallen Leaf, and Gold 

 Lake. The enormous size of the adults is striking. 



There is no previous record of this mosquito from California, 

 though it has a northern distribution, from Alaska eastward to 

 the mountains of northern New York. Its occurrence in the 

 Siei^ras, therefore, was to be expected. The larvae are known 

 to inhabit cold spring pools and can be found all summer. The 

 adults hibernate. 



