230 



3I0SQUIT0ES 



the scales of a butter%'s wing*. The Ciilicid?e that occur 

 in the United States are divided into nine g-enera and 

 about twentj'-four recognized species. More species have 

 been named, but some of them have been shown to be the 

 same as others which were previously named, so they are 

 included as synonyms. In the analytical tables which 

 follow, the characters which disting-uish these different 

 genera and species are given. These tables have been 

 drawn up by Mr. D. W. Coquillett, a well-knoAvn writer 



Fig. 48.— Claws of Front Feet of Culex stimvlans ; female at right, male 

 at left greatly enlarged. (Original.) 



on insects of the order Diptera, who has made at my re- 

 quest a study of the North American species of the 

 family Culicidse. The tables have been made as plain 

 and as non-technical as possible, but there are a few 

 points which should i)erhaps be explained. In unrevised 

 form, these tables appeared in the writer's bulletin on 

 mosquitoes, published in August, 1900, and I have no- 

 ticed that some observers have found difficulty with 

 the characters relating to the teeth of the tarsal claws 



