230 



MOSQUITOES 



the scales of a butterfly's win£r. The Cnlieidne that occur 

 in the United States arc divided into nine genera and 

 about twenty-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 tliej-- are 

 included as synonyms. In the analytical tables which 

 follow, the characters which distinguish these ditferent 

 genera and s))ecies are given. These tabh^s have been 

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



Fio. 48.— Claws of Front Feet of Culex siimvlans ; female at right, male 

 at left greatly eiilari^^eil. (Original.) 



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

 quest a study of the North American species of the 

 family CulicidsTP. Tlie tables have been made as plain 

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

 points which sliouhl ])eiliaps be explained. In unrevised 

 form, those tables apjteared in the writer's bulletin on 

 mos(iuit<)(^s, published in August, 1900, and I have no- 

 ticed that some ol)servers have found difliculty with 

 the characters relating to the teeth of the tarsal claws 



