The Mosquitoes of Canada 89 



11. Setae on apical lobe inwardly directed, on inner surface of lobe 



(group stimulans) 12 



Setae on apical lobe outwardly directed, on outer surface of lobe 

 (group impiger) 16 



12. Basal lobe of side piece with a stout spine 13 



Basal lobe without a spine excrucians Walker 



13. Spine on basal lobe very strong and distinct 14 



This spine scarcely differentiated from adjacent setae 15 



14. Basal lobe large, rugose-tubercular; filament of harpago angularly 



widened beyond middle stimulans Walker 



Basal lobe very small with few setae, non-rugose ; filament of harpago 



smoothly widened at middle cantator Coquillett 



Basal lobe rugose-papillose, the area extending nearly to apical lobe ; 



filament of hajrpago broadly expanded near base, 



fletcheri Coquillett 



15. Spine fairly strong; filament of harpago short, aotched at base, 



fitchii Felt & Young 

 Spine weaker; filament of harpago long, with broad knife-blade ex- 

 pansion riparius Dyar & Knab 



16. Setae on apical lobe moderate and numerous 17 



Setae on apical lobe small, very few 18 



17. Setae on basal lobe many, much shorter thaji the spine, 



lazarensis Felt & Young 

 These setae sparse, not much shorter than the spifie. .pionips Dyar 



18. Adjacent setae of basal lobe about as long as the spine, prodotes Dyar 

 These setae distinctly shorter than the spine impiger Walker 



19. Harpago rather long; filament sickle-shaped with double dorsal 



membranous ridge (group neracticus) nearcticus Dyar 



Harpago long, the filament bud-shaped (group trichurus), 



trichurus Dyar 



Subgenus Heteronych Lynch Arribalzaga. 



Group PULLATUS. 



Aedes (Heteronycha) aurifer Coquillett. 



Culex aurifer Coquillett, Can. Ent., xxxv, 255, 1903. 



A medium sized to rather large brown-black mosquito. Head golden- 

 scaled in the middle and sides, dark brown between. Mesonotum with a 

 very broad median deep blackish brown stripe, leaving the sides narrowly 

 golden yellow. Abdomen black dorsally, with elongate triangular white 

 basal segmental lateral spots; venter mostly whitish. Legs deep black, 

 the femora broadly white below except at tips. Wing scales narrow, 

 black. 



