Fig. 6. — Diagram of adult female mosquito and tfie names 

 given to various parts used in the keys. (Modified from Pratt & 

 Barnes 1959.) 



the minute characters on which the keys to females are 

 based can be seen only with difficulty. In most instances, 

 therefore, males are more dependably identified by means 

 of that set of keys devoted to them. 



Key fo Genera of CULICIDAE (Females) 



1. Vein R-.' branching close to apical margin of wing, 



so that cell R., is only half the length of its stalk, 



R=- (Fig. 7) .' 2 



Vein R=»3 branching much farther from apical mar- 

 gin of wing, so that cell R._, is at least as long as 

 its stalk, R-.» ( Fig. 8 ) ^ 



2. Wing length 6.5 mm or more; thorax with stripes 



of bluish-green scales; proboscis curved downward 

 abruptly just beyond midpoint into a quarter cir- 

 cle, palp very long and massive (l"ig. 17). Sole 

 Illinois representative, occurring in southern part 

 of state. . . .Toxorhynchites rutiius septentrionalis 

 Wing length under .^.'i mm; sides ot thorax with 

 many small, highly iridescent blue scales; probos- 

 cis only slightly curved, palp short and abortive 

 (Fig. 18). Sole Illinois representative, common 

 throughout the state Uranotaenia sapphirina 



4. 



Mesoscutellum with posterior margin evenly round- 

 ed, the setae or hairs arranged evenly along it 

 (Fig. 9); palp as long as proboscis (Fig. 21). . . . 

 Anopheles 



Mesoscutellum with posterior margin incised to 

 form a mesal lobe and 2 lateral lobes, with the 

 setae grouped on these 3 lobes (Fig. 10); palp 

 much shorter than proboscis (Fig. 20) 4 



Mesonotum with a mesal line of short setae and 

 scales bordered by a glossy bare area along 

 each side of the mesal line (Fig. 11); apex of 

 hind femur with a tuft of projecting hairs (Fig. 

 13) Psorophora 



Mesonotum without glossy bare areas; apex of hind 

 femur with only a tew or no projecting hairs 

 (Fig. 14) 5 



5. Hind tarsus with 1 preapical or 2 apical segments 



entirely white, the remainder entirely blue or 



black Psorophora 



Hind tarsus either with some segments ringed with 

 white (Fig. 14), or all segments nearly the same 

 color 6 



6. Hind tarsus with wide or conspicuous bands of white 



on most segments (Fig. 14) 7 



Hind tarsus with no bands, or bands only faintly 

 and indistinctly indicated 13 



7. Second, third, and fourth tarsal segments of hind 



leg each with a narrow white band at each end 



(Fig. 14) ...S 



Second, third, and fourth tarsal segments of hind 

 leg each with a white band at base only (Fig. 31- 

 3.3) 10 



8. Proboscis black, with a definite white band in mid- 



dle, as in Fig. 19 Culex tarsalis 



Proboscis not banded; either all black, mottled, or 

 black except for rows of white scales along its 

 entire length (Fig. 20) 



9. Mesonotum nearly black, but with a series of sharp- 



ly contrasting white lines, as in Fig. 12 



Orthopodomvia 



Mesonotum either without white lines, with only 

 pale lines, or generally light colored 17 



Post-spiracular area of thorax entirely bare (Fig. 

 22); dorsum of thorax with many long, abundant, 

 and erect hairs. Sole Illinois representative, wide 

 spread in state Mansonia perturbans 



Post-spiracular area of thorax with bristles or a 

 patch of scales (Fig. 23); dorsum of thorax with 

 all hairs much more appressed 1 1 



Outer face of hind femur in general dark but with 

 a transverse band of white scales just before apex 

 (Fig. 16) Psorophora confinnis 



Outer face of hind femur without such band 1 



Will" havins either costa banded with white-scaled 

 areas and black-scaled areas, or anal vein white 

 .scaled for basal two-thirds and apical portion 

 black-scaled Psorophora 



Wine either almost uniformly white- or dark-scaled, 



10 



II 



12 



