Vol. Xxiv] ENTOMOLOGICAL NEWS. 71 



Long slender larva, antennal tuft of i or 2 hairs ; 25-35 scales in 

 patch; 17-21 siphonal spines with 2 or 3 long teeth at base, 



Aedes atro palpus 



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 immacu- 

 late ; 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 breeder 4edes cintator 



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

 16-22 siphonal spines, with i or 2 large and 4-6 smaller teeth 

 on basal half; head immaculate; fresh water form, 



Aedes subcantans 



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



Last two segments, with dorsal plates ; antenna very short, 



Aedes signifer 



18. Antenna not specially marked or colored 19 



Antenna 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 la,t- 



eral spines; siphonal spines 17-22 with 4 or 5 large teeth 

 basally Aedes sylvicola 



20. Scales 25-30, with short apical and very short lateral spines ; 



siphonal spines 16-20, with i or 2 teeth at base, i usually 

 very large Aedes pretans 



Scales 40-45, with 5-7 large apical and smaller lateral spines ; 

 16-22 siphonal spines, with usually i or 2, rarely 3 or 4 small 

 teeth Acdcs inct>iispicniis 



Scales 45 (one larva) with small, slender, apical and fine lateral 

 scales; 15-27 siphonal spines with 1-3 large teeth; rust col- 

 ored marks on thorax Aedes iiircitarsis 



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. 



