60 



MISC. PUBLICATION 336, U. S. DEPT. OF AGRICULTURE 



femora and tibiae are speckled, and at least the hind femur has a 

 narrow white ring near the apex. In subgenera Psorophora and 

 J anthinosoma the mesonotum is partially or completely covered with 

 broad,' flat scales and some of the leg scales frequently are erect. 

 The subgeneric divisions of Aedes are not easily defined on markings, 



//i/mera/ Cos fa/ 



cross ye//7 



/ Cos fa/ ye/'/? 



Pef/o/e of 2^ 

 Su/pcosfa/ /nary/ha / ce// 

 ye/'r? i 



,Su/?cosfa/ 

 ' ce// 



6 (*/7a/ ye/W) 



Figure 16. — Wing of mosquito (Howard, Dyar, and Knab). The correspond- 

 ing symbols for the veins in the Comstock-Needham system are: 1, R; 2.1 

 and 2.2, R 2 and Rz ; 3, R±+ 5 ; 4.1, J/i +2 ; 4.2, M 3 ; 5.1 and 5.2, Cui and Cw 2 ; an- 

 terior cross vein, r-m; posterior (basal) cross vein, m-cu. 



and these groupings have not been included. The subgenera of 

 Culex have been referred to in the discussion of that genus. 



Difficulties may arise from the separation of the species of Wyeo- 

 myia on the pale tarsal markings, as these are easily overlooked. 

 The species are of extremely limited distribution, however, and are 

 rarely collected. The 

 positive means of iden- 

 tification of the genus 

 is by the presence of 

 postnotal bristles. 



KEYS TO ADULTS 



All the known south- 

 eastern species are in- 

 cluded in the first key. 

 Following this is a short 

 key to the male termi- 

 nalic characters of the 

 dark-legged Culex and 

 then a separate key giv- 

 ing a synopsis of gen- 

 eric characters. 



Segment & 



\Sey/77e/7f 7j 



Cere/ 



Figuee 17. — Characteristic shapes of tip of female 

 abdomen: A, Aedes (also similar in Psorophora) ; 

 B, Culex. 



SPECIES KEY 



In the species key the characters apply primarily to the female, 

 unless the male is mentioned. Although the markings of the male are 

 generally similar to those of the female and the males of most species 

 can be identified by the characters given, some differences occur in 

 the distribution of the pale scales. The white bands on the abdominal 

 segments, for example, cannot be used satisfactorily in identifying 



