. REPORT ON MOSQUITOES. 313 



Larvae are rarely found until well along in May, and then only 

 in comparatively small numbers. They do not become really 

 common until July ; but after that period and throughout August 

 there is no suitable place where swarms of larvae cannot be found. 

 They continue in decreasing numbers after September until hard 

 frost. I have found some of them under quarter-inch ice in No- 

 vember and bred adults from them. 



There is nothing in any way peculiar in this larva or its 

 development : it is typical in habit, entirely dependent upon the 

 outer air for its supply of oxygen and succumbs readily to any 

 oily covering of its breeding place. 



The question of remedial measures is elsewhere taken up at 

 length. 



CUI.EX RHSTUANS, THEOB. 



The White Dotted Mosquito. 



This species is closely related to pipiens in structure and habits, 

 and without the aid of ar lens no differences can be observed. The 

 point of discrimination lies in the thorax; this has two or foitr 

 small white spots on the upper surface and sometimes a U-shaped ' 

 mark near the base. 



Description of the Adult. 



This mosquito runs about the size of C. pipiens, though in 

 general it is smaller. The head is brown, with scattered yellow 

 scales, and there is a yellow border to the eyes. The proboscis, 

 antennas and palpi of the male are fuscous; the palpi whitish 

 beneath at the bases of the apical joints. In the female the 

 palpi are dark brown, grayish at the apex, the fourth joint being 

 shorter and retracted; the antennae and proboscis are also dark 

 brown. 



The thorax is brown, with many scattered yellow scales over 

 the surface and two or three equally spaced stripes of black 

 bristles down the center. TwO' white spots on the middle of the 

 dorsum are almost always present; two other patches of white 

 are often situated more laterally and posterior of the spots, and 

 an inverted U broken at the middle, near the base. The femora 

 and tibiae are brown, lighter beneath and at the basal part of 

 the femora; the knees are distinctly white and the tarsi blackish 

 throughout. The claws are the same as in C. pipiens: the ante- 

 rior and mid unequal and one toothed, the posterior and all those 

 of the female equal and simple. 



