232 MOSQUITO ERADICATION 



14. Scales 14-22, with stout apical and slender lateral spines; 13-18 



siphonal spines with 2 or 3 small teeth sometimes simple; fresh 



water, Aedes trivittatus. 

 Scales 16-22, with rounded apex and slender lateral spines; 12-16 



siphonal spines with 1-4 small teeth on both sides; head maculate; 



salt marsh, Aedes taeniorhynchus. 

 Scales 20-40, with stout apical and slender lateral spines; 16-24 



siphonal spines with 1-5 small teeth; head generally immaculate; 



salt marsh, Aedes sollicitans. 



15. Scales rather broad (16). 

 Scales elongate (17). 



16. Scales 35-40, with 3 stout apical and smaller lateral spines; 16-20 



siphonal spines with 1-3 small teeth; head maculate; salt marsh, 

 Aedes cantator. 

 Scales 25-50, with one very stout apical and slender lateral spine; 

 16-22 siphonal spines, with 1-2 large and 4-6 smaller teeth on 

 basal half; head immaculate; fresh water form, Aedes stimulans. 



17. Only the terminal segment, with a dorsal plate or ring (18). 



18. Antennae not specially marked or colored (19). 



Antennae prominent, white at base, dark at tip, Aedes aurifer. 



19. Moderate-sized species (20). 



Very large larva; scales 28-34, with long apical and slender lateral 

 spines; siphonal spines 17-22, with 4 or 5 large teeth basally, Aedes 

 grossbecki. 



20. Scales 25-50 with short apical and very short lateral spines; siphonal 



spines 16-20, with 1-2 teeth at base, one usually very large, Aedes 

 hirsuteron. 

 Scales 25-50, with small apical and smaller lateral spines; 16-24 

 siphonal spines with 4-5 serrations on basal half; antenna dark at 

 tip, Aedes canadensis. 



21. Antennal tuft above the middle. 



Anal siphon of moderate length, sides a little inflated; tracheal gills 



moderately long, Culex pipiens. 

 Anal siphon very long, rather slender and slightly tapering to tip; 



head narrower than thorax; tracheal gills short, Culex salinarius. 

 Anal siphon very long and slender; a little constricted centrally; head 



as wide as thorax; tracheal gills moderate or long, Culex lerritans. 

 Antennal tuft below middle. 



Scales 24-30, antenna not arising from an offset, Aedes abfitchii. 

 Anal siphon of moderate length; tracheal gills rather long, Culex 



restuans. 

 Anal siphon 5 times as long as widest diameter; antennae dark at tip, 



Aedes fitchii. 



22. A bronzed, brown larva, with rather long, moderately stout, black 



breathing tube, Culex melanurus. 



