ART. 1. MOSQUITOES OF THE UNITED STATES—DYAR. 43 
spring. These species are often abundant and annoying, but none 
of them are known to convey diseases of man. 
The genus has been divided into a number of subgenera on the 
characters of the male genitalia. The groups occurring in the United 
States may be separated as follows: 
a 
2 
bo 
alae 
12. 
. Mesonotum pale, with broad dark median stripe_—-| 
GUase teen esemt et ee a 
@laspette absent ——---——_—----—__- - = nnn 3. 
Sidepiece with apical and basal lobes____-_-_-------- = =-—--- -- = === ===-=-—-— 
Subgenus Heteronycha Lynch Arribalzaga. 
Sidepiece with basal lobe, no apical one__------—------------------------- 
j Subgenus Taeniorhynchus Lyneh Arribalzaga. 
Sidepiece without lobes_---------------------- Subgenus Finlaya Theobald. 
. A hairy or spinose lobe at base of sidepiece____-------------------------- 4, 
Without this structure; basal membrane expanded or modified_-------__--- 
Subgenus Stegomyia Theobald. 
_ Lobe at base of sidepiece complex ; clasper modified, furcate and with a 
basal branch ___-----~------------------------- Subgenus Aédes Meigen. 
This lobe simple; clasper without basal branch, though sometimes modified 
Dt ADCK. 22 oe Subgenus Ecculex Felt. 
KEY TO THE UNITED STATES SPECIES OF AEDES. 
. Tarsi with white rings on both ends of the J0intS. 22 eee 2. 
Tarsi with white rings basally on the joints___----------------------- 6. 
Tarsi without white rings-----------------------------------------—— 16. 
. Wing scales markedly bicolored__-2=_---—-_---=-=-—---=-----—-------_-- 3. 
Wing scales uniformly dark, or nearly sO__--------------------------- 4, 
. Larger species; wing veins evenly mottled==2== campestris Dyar and Knab. 
Smaller species; third vein darker sealed than adjoining ones. 
dorsalis Meigen. 
_ Mesonotum uniformly brown, or nearly so_----------- canadensis Theobald. 
Mesonotum ornamented, striped or spotted_---------------------------- 5. 
epactius Dyar and Knab. 
atropalpus Coquillett. 
Mesonotum pale yellowish with dark spots__--------- varipalpus Coquillett. 
Mesonotum pale golden before, varied with brown behind; tarsal pale rings 
almost wholly basal_----------------------------------- fluviatilis Lutz. 
. Proboscis of the female white ringed_-------------------------------- tf 
Proboscis of the female without white ring-------------------------- tal 
. Abdomen with a longitudinal dorsal pale stripe_——---------------------~ 8. 
Abdomen without a dorsal pale stripe--------------------------------- 10. 
. Wing scales wholly dark__-------~---------------------- mitchellae Dyar. 
Wing scales dark and light mixed_-------__--------------------------~ 9: 
. Abdomen with sides and dorsal stripe concolorous__--nigromaculis Ludlow, 
Abdomen with white lateral spots, not concolorous with dorsal stripe. 
sollicitans Walker. 
. Last joint of hind tarsi white----------------- taeniorhynchus Wiedemann. 
Last joint black, white at base----------------------- portoricensis Ludlow. 
Mesonotum with lyre-shaped silvery marking_------------ aegypti Linnaeus. 
Without such markings____------------------------------------------ 12: 
Tarsal pale rings broad, especially on nindklecste= ee 15%. 
Tarsal pale rings narrow ; mesonotum WHOL ys DrOWNe = =a —a— 15. 
