86 Transactions of the Royal Canadian Institute 



2. Side piece with basal and apical lobes, 



Heteronycha Lynch Arribalzaga 

 Side piece with basal lobes only, 



Taeniorhynchus Lynch Arribalzaga 

 Side piece without lobes Finlaya Theobald 



3. Side piece with apical appendage Ecculex Felt 



Appendage of side piece subapicel, modified Aedes Meigen 



Key to the Canadian species of Aedes. 



1. Tarsi with white rings on both ends of the joints 2 



Tarsi with white rings basally on the joints 6 



Tarsi without white rings 9 



2. Wing-scales markedly bicoloured 3 



Wing-scales uniformly dark, or nearly so 4 



3. Larger species; wing- veins evenly mottled 



campestris Dyar & Knab 

 Smaller species; third vein darker scaled than the adjoining ones, 



curriei Coquillett 



4. Mfesonotum pale, with broad dark median stripe, 



atropalpiis Ooquillett 

 Mesonotum differently coloured 5 



5. Mesonotu'm pale yellowish with dark spots, .varipalpus Coquillett 

 Mesonotum uniformly brown, or nearly so. . . .canadensis Theobald 



6. Proboscis of the female white-ringed sollicitans Walker, 



nigromaculis Ludlow 

 Proboscis of the female without white ring 7 



7. White rings of tarsi broad; m'esonotum varied with whitish 8 



Tarsal rings narrow; mesonotum uniformly brown^ 



cantator Coquillett, vexans Meigen 



8. Yellowish species, the pale abdominal scales yellow, diffused, 



fietcheri Coquillett, ripariiis Djyar & Kpab 



Not yellowish, the pale abdominal scales white, generally concrete, 



excrucians Walker, stimulans Walker, fitchii Felt & Young 



9. Mesonptum dark centrally, silvery gray at the sides, .triseriatus Say 

 Mesonotum yellow or brown, with or without dark bands 10 



10. Abdomen with continuous, or nearly so, white lateral line, 



cinereus Meigen 

 Abdomen transversely bajided, the lateral spots npver joined .... 11 



11. Wing scales markedly bicoloured on alternating veins 12 



Wing scales uniformly dark coloured, or nearly so 13 



12. Abdomen with median dorsal longitudinal pale stripe, 



spencerii Theobald 



