REPORT ON MOSQUITOES. 291 



examples mingled with sylvestris, and that completes the 

 record. As compared with the other larvae that of trivittatiis 

 was always rare and only a very few examples were obtained for 

 preservation. It seems to be one of those species in which the 

 larvae develop very evenly, for only the full grown wrigglers and 

 pupae were collected. As to the character of the breeding pools 

 these are the usual depressions occurring in woodland; kept 

 moist by shade and small springs, so as to fill readily during a 

 heavy rain and kept up by the same factors long enough to bring 

 even the slow-growing larvae to maturity. Nothing is definitely 

 known as to the length of any period. 



CUI.EX PRETANS^ GROSSBECK. 



The Brozvn-striped Mosquito. 



A dark brown species with legs and beak unhanded, the thorax 

 yellowish with a broad median brown stripe and a smaller mark 

 of the same color on each side of the posterior third. The 

 abdomen is brownish black with narrow white basal bands, which 

 become wide at the sides. 



Description of tJic Adult. 



This is a medium sized mosquito measuring about 5 mm., 

 = .20 of an inch in length exclusive of the beak, which is over 

 2 mm., or nearly half the length of the body. The occiput of the 

 head is dark brown, almost wholly covered with pale yellow 

 scales, some of wdiich collect into a distinct border to the eyes, 

 and on each side is a small patch of dark brown scales. The palpi 

 of the female are dark brown in color, of the normal Culex form ; 

 but the terminal joint is almost obsolete; in the male thc}^ are of 

 the same shape as in C. canadensis, dark brown, almost black. 

 The antennae are dark brown in both sexes, with the two basal 

 joints in the female pale testaceous. 



The thorax is covered with yellowish scales and has an 

 usually well defined broad median stripe of brown scales, which 

 begins almost at the anterior margin and is slightly constricted 

 centrally ; there are also two other patches of brown scales about 

 one-third the length of the thorax, at the base of this stripe, on 

 each side and separated by a narrow line of yellow scales. The 

 pleura are very dark brown, with patches of pure white scales. 

 The legs are dark brown, almost black, wath the -under sides 

 of the tibicG pale yellow and of the femora creamy white, with a 



