STRUCTURE, CLASSIFICATION, AND KEYS 27 



KEY NUMBER 3 



Eye and Hand-lens Key to the Adults of the 

 More Common Species * 



A Palpi at least three-fourths the length of the beak. 



I Wing mottled, bearing one large rather distinct white spot: Anoph- 

 eles punctipennis Say 



II Wing without white spot but with four fairly distinct blackish 

 spots ; the spots due to aggregation of scales : palpi dark brown 

 throughout: Anopheles quadrimaculatus Say 



III Same as II except palpi show white at base of segment and 

 at top: Anopheles walkeri Theob. 



IV Wing not as above but with decidedly blackish front edge; this 

 appearance due to aggregation of scales along front edge; Anopheles 

 crucians Wied. 



B Palpi scarcely more than one-fourth the length of the beak. 



I Feet without white or yellowish bands : 



1 Front edge of abdominal segments bordered by white bands : 

 Culex pipiens Linn,, Culex salinarius Coq. 



2 Back edge of abdominal segments bordered by white bands 

 which are narrow and sometimes broken: Culex apicalis Adams 



II Feet white or yellowish banded: 



1 Beak with white circular band : 



a Edges of white band not sharp; rough scaly species, 

 much white on legs and feet: Mansonia perturbans Walk, 

 b Edges of white band sharp: 



(1) Yellowish-white band running lengthwise the 

 upper surface of the abdomen; no white bands or 

 sharply-defined spots on the hind femur or tibia: 

 A'edes sollicitans Walk. 



(2) No lengthwise median band; no spots on the 

 hind femur or tibia; two white spots, one on each 

 side of the dorsal aspect of each of two abdominal 

 segments before last: A'edes taeniorhynchus Wied. 



2 Beak without circular band: 



a Abdominal bands white and rather sharp edged; ab- 

 dominal bands so strongly notched from the rear as to 

 appear almost divided; tarsal bands not occurring on both 

 ends of the same segment: A'edes vexans Meig. 

 b Abdominal bands not so notched; white bands on both 

 ends of the hind tarsal segments, the joint between the 

 tibia and the first tarsal segment being completely white 

 and thus forming the characteristic "white knees" of this 

 species: A'edes canadensis Theob. 

 c Abdominal and tarsal bands yellowish, no sharp notch- 



* It is impracticable to separate certain species such as C pipiens and C salinarius 

 and A. cantator and A. stimulans by hand-lens characters. For such work see Key 1. 



