232 Mosquitoes 



est width, which is about twice that of apex. 

 (Fig. 47, page 244). . .Grabhamia jamaicensis. 

 Comb an irregular row of ten or more teeth, 

 secondary spines of scales very slender. Spines 

 of tube more than ten, the last two or three 

 separated from the rest. (Fig. 48, page 245.) 



Aides fiiscus. 



35. Antennal tuft with at least three more or less 



plumose hairs; antennae with spinules. Head 

 tuft B with never more than three hairs; A 



with one to three hairs 37 



Antennal tuft represented by a single hair, 

 antennae smooth. Head tufts as above. . .36 



36. Ventral tufts of ninth segment bifurcate, occa- 



sionally the caudal pair trifurcate. Tuft 

 C one-haired. Comb scales with apical spine 

 much larger than the others. (Fig. 30, page 146.) 



Stegomyia calopus. 



Ventral tufts of last segment of four or five 



hairs. Tuft C five- or six-haired. Tuft of 



tube of one or two hairs. (Fig. 49, page 246.) 



Ochlerotatus triseriatus. 



37. With fourteen or more spines on tube, the tuft 



well developed and placed near pecten . . 38 

 With not more than eight spines on tube. . .39 



38. Comb scales five to seven, arranged in a curved 



row, scales rather broadly spatulate at base, 

 and with a stout central spine bearing seven 



or eight very minute teeth 



Ochlerotatus abserratus. 



Comb scales twelve to sixteen, and with the 



upper pair of teeth decidedly heavier than 



the rest Ochlerotatus auroidcs. 



