242 NEW YORK STATE MUSEUM 



specific identity, we prefer to describe and risk creating a synonym 

 rather than confuse two species. We have studied, in the course 

 of this work, specimens of over 40 species. Tearing from larvae 

 both sexes of most forms. 



The writer acknowledges the earnest cooperation of his assist- 

 ant, Mr D. B. Young, who has not only done much of the field 

 work, but has determined many of the species and prepared the 

 tables for separating the adults. 



Mr C. M. Walker did considerable field work and breeding in 



1903. Most of the determinations have been kindly reviewed 



through the courtesy of Dr L. O. Howard, by Mr D. W. Coquillett, 



of the United States National Museum. Due acknowledgment 



should also be made to Dr H. G. Dyar of the same institution, 



who generously donated a number of larvae and adult mosquitos 



from which certain illustrations were made. 



E. P. Felt 

 Albany N. Y. March 1904 



