254 Mosquitoes 



15. H on segments four to seven, four-haired, the 



hairs long and widely divergent ; on segment 

 eight a small tuft with a long one just ahead. 

 K two-haired, long, on segments six and 

 seven ; three-haired, short, on segments four 



and five Culex tarsalis. 



H never four-haired, at least on segments six 

 and seven , and never with widely divergent 

 hairs 16 



16. K on segments four and five, or five to seven, 



conspicuously longer than the chitin of the 



next segment 17 



K never conspicuously longer than the chitin of 

 the following segment 18 



17. Breathing tubes over five times as long as wide. 



Segments five to seven having K at least 

 twice as long as the following segment. 



Culex restuans. 



Breathing tubes somewhat over twice as long as 



wide. Segments five to seven having K not 



over one and one-half times the length of the 



following segment. 



OcJderotatus tceniorJiyncJius. 



18. Terminal tufts on paddles small, four- to six- 



haired. Many of the body tufts compoundly 



branched Pncumaculex signifer. 



Terminal tufts on paddles, if minute, not having 

 over two hairs 19 



19. With terminal hair on paddle at least one-third 



the length of the latter 20 



With the terminal hair never over one-fourth 

 the length of paddle 21 



20. Breathing tubes over three and one-half times 



as long as wide, spines not noticeable. K 

 on segments six and seven, single. Ter- 

 minal hair about one-half the length of 

 paddle OcJderotatus atropalpus. 



