230 Mosquitoes 



Anal gills never twice as long as tube. Antennae 

 never with spines as above. Gills never as 

 above 26 



26. Pecten extending beyond tuft 27 



Pecten sometimes extending to, but never be- 

 yond, tuft. Anal gills never constricted 

 toward tip 29 



27. Constrictions, one or more, present toward tips 



of anal gills 28 



Constrictions absent. Gills of almost uniform 

 width to bluntly rounded apex. Antennae 

 with a few spinules, one or two hairs in tuft. 

 Tufts A and B one-haired. 



OcJrferotatiis atropalpus. 



28. Anal gills with one constriction. Tuft of tube 



below middle, pecten not extending more than 

 two-thirds up. (Fig. 45 page 242.) 



Ochlcrotatus bimaculatus. 

 Anal gills with three constrictions. Tuft of tube 

 above middle. Pecten extending almost to 

 tip of tube. (Fig. 46, page 24".) 



OcJdcrotatus serratus. 



29. Comb in one row, sometimes irregular 30 



Comb in two or more rows 42 



30. Tufts A and B each represented by a large 



stout spine on which are spinules. Antennae 

 with a few scattered spines, tuft represented 

 by a single hair. Stellate hairs on thorax and 



abdomen 31 



Tufts A and B of one or more hairs. Antennae 

 either with tufts of more than one hair and 

 with spines, or with a single hair and smooth. 33 



