AEDES 0N0NDAGEN8IS 633 



" The larvae of this species are not confined to brackish water only, or to 

 normal sea water, but may develop abundantly in water of a higher saline con- 

 tent than even sea water. The water in a number of instances where . . . larvae 

 were found tested 4.5 per cent of salt, or 1 per cent higher than normal sea 

 water 



" The typical places where . . . larvae were found were the pools and depres- 

 sions bordering the edge of the marsh, where only the water of the monthly 

 high tide found its way. After the rains had ceased in the spring the broods 

 appeared as regularly as the tides themselves. . . . These larvae were first seen 

 on February 30th in 1905, and the last brood in 1904 disappeared on September 

 25th. They were generally found in pools or situations which contained rather 

 clean water, but in the diked area they were found in water highly impregnated 

 with a reddish mineral deposit, probably ferric iron 



" [The adult] hatching from its breeding place on the salt marsh, makes 

 its way inland, usually in the direction of favorable winds. During June, 1904, 

 they were found abundantly in the hills ... a distance of 10 miles from the 

 salt marsh. They are active all day, but particularly late in the afternoon and 

 early evening, when there is but little wind. They have been seen to congregate 

 in innumerable numbers in the wooded canons of the hill slopes . . . and make 

 life interesting for man as well as stock. This species is particularly bold and 

 vicious, and does not hesitate to thrust its beak through a couple of thicknesses 

 of clothing. It is not as troublesome in houses and is seldom found there, but 

 prefers the sheltered places out of doors." 



On the Pacific coast the species is only locally abundant, since flat salt-marshes 

 are essential to its occurrence, and most of that coast is high and rocky. Dr. 

 Dyar and Mr. Caudell observed the species at Eureka, California, and at various 

 points on Puget Sound. To the south of San Francisco Bay the species did not 

 occur, its place being taken by Aedes tmniorhynchus. 



We have larvae identical with those from the Pacific coast collected at Ithaca, 

 New York, but we have no data on their habits. We have not seen larvs from 

 the Atlantic coast and have no information on their habits beyond the fact that 

 the imagos appear at certain times in large numbers. 



Pacific and Atlantic coasts of United States and Canada; central New York 

 State. 



Stanford University, California, September 15, 1901 (I. McCracken) ; Oak- 

 land, California, July 24, 1903 (I. McCracken) ; Arden, California, July 19, 

 1903 (I. McCracken) ; San Jose, California, July 25, 1906 (I. McCracken) ; 

 Eureka, California, July, 1906 (A. N. Caudell) ; Tacoma, Washington, August 

 1, 1906 (Dyar and Caudell) ; Vancouver, British Columbia, August 6, 1906 

 (Dyar and Caudell) ; Duncans, British Columbia, August 8, 1906 (Dyar and 

 Caudell) ; Qualicum, British Columbia, July 20, 1903 (J. Fletcher) ; Nanoose 

 Bay, British Columbia, August 1, 1903 (J. Fletcher) ; Ithaca, New York, 

 May 16, 1900, May, 1903, July 26, 1901, July 29, 1903 (0. A. Johannsen) ; 

 Boston, Massachusetts, July 16, 1906 (C. W. Johnson) ; West Peabody, Massa- 

 chusetts, August 13, 1911 (A. N. Caudell) ; Delta, Louisiana, June 20, 1904 

 (E. S. G. Titus) . The species is reported also from Syracuse, New York (Felt) 

 and New Haven, Connecticut (Britton and Viereck) . 



Aedes onondagensis agrees in coloration characters of the imago with Aedes 

 cwrriei and shows the same extremes in variation. The light color of the thorax 

 varies from greyish white through ocherous yellow to brownish yellow; the 

 brown markings vary greatly in extent, intensity and definition and may become 

 almost obsolete. The abdominal coloration varies in the same manner as in 

 Aedes cwrriei, A. spencerii and other similarly ornamented species; the dorsum 

 may be nearly wholly black, with only narrow segmental pale, margins, or it may 

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