Carpenter et al.: Mosquitoeg of Southern U. S. 239 



Each plate of phallosome with a single short triangular tooth between the dorsal 

 and ventral arms; crown of 10th sternite with all spines pointed; basal arm of 

 10th sternite weakly sclerotized resluans Theob., p. 250 



II. Dorsal arm of phallosome bent medially at right angle; crown of 10th sternite 

 with all spines pointed; lobes of 9th tergite widely separated, only slightly 

 raised; apical margin of 8th tergite bearing numerous, rather long slender 



setae (longer than those on lobes of 9th tergite) salinarlus Coq., p. 253 



Dorsal arm of phallosome nearly straight; crown of 10th sternite with outer 

 spines blunt; lobes of 9th tergite separated by no more than the width of one 

 lobe, prominent; apical margin of 8th tergite bearing numerous short stout 

 setae (shorter than those on lobes of 9th tergite) nigripalpiis Theob., p. 243 



LARVAE (fourth INSTAr) 



1 . Siphon spinose; anal g'lls 2, thick, bulbous; pect:n teeth progressively more 



widely spaced hahamensis D. and K., p. 242 



Siphon not spinose; anal gills 4, normal; pecten teeth usually evenly spaced 2 



2. Antenna of nearly uniform shape, with antennal tuft inserted near middle of 



shaft; siphon with 4 to 6 long single irregularly placed hairs and a pair of 



small 2 to 3-branched subapical tufts restuans TTieob., p. 251 



Antennal tuft placed in a distinct constriction at outer third of shaft, the portion 

 beyond the tuft more slender; siphon with hair tufts multiple (occasionally 

 double or single), not irregularly placed although the subapical pair may be 

 laterally out of line 3 



3. Both lower and upper head hairs (B and C) multiple, long 4 



Lower head hair (B) single (sometimes double) 7 



4. Siphon 4 or 5:1 ; lower head hair (B) usually with 5 or more branches 5 



Siphon 6 or 7:1 ; lower head hair (B) usually w:th 3 or 4 branches 6 



5. Siphon with subventral tufts in a straight line iarsalis Coq., p. 259 



Siphon with subapical subventral tuft laterally out of line 



quinquefasciaius Say, p. 248 

 p'lpiens Linn., p. 246 



6. TTiorax spicular; lateral hair of anal segment usually single 



nigripalpus Theob., p. 244 



Thorax glabrous; lateral hair of anal segment usually double ..salinarius Coq., p. 254 



7. Pecten teeth each with I to 4 long coarse side teeth; upper head hair (C) 



usually single, occasionally double, nearly as stout and about two-thirds as 

 long as the lower head hair (B) ; siphon very long and slender, about 7:1 



apicalis Adams, p. 272 



Pecten teeth each fringed on one side nearly to tip; upper head hair (C) 

 single, double, or multiple, much shoiter and weaker than the lower head hair 



(B) ; siphon long or short (Subgenus M elanocon'ion) 8 



8. Comb scales long, thorn-shaped, arranged in a curved or irregular single or 



double row 9 



Comb scales rounded apically and fringed with subequal spinules, arranged in a 

 triangular patch -- 10 



9. Siphon short, 3 or 4:1, with 8 pairs of very long subventral tufts, the proximal 



pairs about as long as siphon; upper head hair (C) single, occasicmlly 



double, about half as long as the lower head hair (B) and much weaker 



pilosus (D. and K.), p. 269 



Siphon long and slender, 6 or 7:1, with 5 or 6 pairs of subventral tufts, none 

 of which are more than one-third the length of the siphon; upper head hair 



(C) 4 or more branched, very short, weak erraticus (D. and K.), p. 263 



10. Upper head hair (C) short, weak, 5 or 6-branched; siphon about 7 or 8:1 



alratus Theob., p. 261 



Upper head hair (C) short, weak, 2 or 3-branched, occasionally single; siphon 

 about 6:1 peccalor D. and K., p. 266 



