northern species not yet found but to be expected 



in northern Illinois communis 



Dark stripes of mesonotum separated by a very 

 narrow mesal stripe of pale scales (Fig. 56). A 

 Holarctic woodland floodplain species abundant 

 along rivers throughout Illinois. Typical form 

 of . .y sdcticus 



26. Central strips of mesonotum tapering posteriorly 



to a narrow point, well defined (Fig. 58). A 

 central and eastern woodland species abundant 



over most of Illinois trivittatus 



Central stripe of mesonotum either wider posteri- 

 orly (Fig. ^O, 51) than in Fig. 58 or parallel sided 

 (Fig. 57) 27 



27. Central stripe of mesonotum parallel sided, some- 



times with a pair of detached short dark stripes 

 along posterior half (Fig. 57); dorsum of each 

 abdominal segment with complete basal white 



band. Slightly rubbed specimens of sticticus 



Central stripe of mesonotum narrower in anterior 

 than in posterior part, usually widened posteri- 

 orly to almost the full width of the mesonotum 

 (Fig. 49-52); dorsum of each abdominal segment 

 mostly blue-black, perhaps with lateral white 

 spots, but without white band 28 



28. Scales of lateral area of pronotal lobe white and 



wide, markedly overlapping to form a solid shin- 

 gled area (Fig. 38) 29 



Scales of lateral area of pronotal lobe long and nar- 

 row, tawny or yellowish in color and not solidly 

 shingled (Fig. 39) 30 



29. Dark mark of mesonotum wide (Fig. 51), with a 



definite shoulder where wider posterior portion 

 begins to narrow to narrower anterior portion. 

 An eastern species sometimes common in wooded 

 areas of Illinois, particularly in southern counties 



triseriatus 



Dark mark of mesonotum as narrow as in Fig. 52, 

 the anterior portion tapering uniformly from 

 wider to narrower portion 



light specimens of triseriatus 



dark specimens of hendersoni 



30. Mesal dark mark of mesonotum with anterior por- 



tion narrow, suddenly widened beyond middle 

 to include nearly full width of mesonotum (Fig. 

 49); anterior latewJ areas bright grayish. An 

 eastern and southern woodland species; in Illinois, 

 restricted to floodplains in the southern half of 

 the state where tupelo gum trees arc present. . . . 



thibaulti 



Mesal dark mark of mesonotum witii anterior part 

 wider than in Fig. 49, widening gradually or by 

 small steps to posterior margin (Fig. "iO); an- 

 terior lateral areas grayish, shading to a golden 

 tint where they merge with mesal dark area. A 

 northeastern and north-central woodland species 

 known in Illinois only from Karnak aurifer 



31. Base of costa with a short patch of pale scales, as 



in Fig. 35. A northern species occurring in open 

 woods; not yet found but to be expected in north- 

 ern Illinois trichurus 



Base of costa at most with a few scattered pale 



scales 32 



32. Mesepimeron with lower third bare, upper two- 

 thirds covered with a patch of white scales; coxa 

 (basal segment) of front leg with a patch of dark 

 scales; membrane posterior to this coxa without 

 scales; wing at most 4.3 mm long. A Holarctic 

 northern species common in marsh and bog areas 

 in northern Illinois; local in dense woods of cen- 

 tral Illinois cinereus 



Mesepimeron with white scales extending to its 

 lower edge; coxa of front leg with only pale 

 scales; membrane posterior to this coxa with 

 numerous pale scales; wing usually 4.8 mm long 

 or longer. Two extremely similar northern spe- 

 cies, eastern ahserratus and Holarctic punctnr. both 



found in northern Illinois bogs ahserratus 



punctor 



Key to Species of ANOPHELES (Females) 



1. Wing with spots or bars of white or yellowish white 



scales along anterior margin and anal vein (Fig. 



59, 60) 2 



Wing without any pale patches, all scales dark (Fig. 

 61) except sometimes those on apical fringe. . . .3 



2. Anal vein with 3 short dark bars separated by white 



bars, costa with a white spot only at apex of wing; 

 palp dark except for white bands (Fig. 60). An 



eastern and southern species local in Illinois 



crucians 



Anal vein with apical half and extreme base black, 

 and with a single white area between; costa with 

 an apical white spot and usually also a preapical 

 spot or bar; palp black, unhanded (Fig. 59). A 

 transcontinental species widespread in Illinois, 

 common before July punctipennis 



3. Tip of wing with a patch of silvery or golden fringe 



scales; dark wing spots very pronounced. A 

 northern species not yet found, but to be expected. 



in Illinois earlei 



Tip of wing with fringe not different from remain- 

 der; dark wing spots either pronounced or ob- 

 scure 4 



4. Palp black except for rings of white scales at joints 



(Fig. 62). An eastern species widespread in Illi- 

 nois but not common south of the northern fitth 

 of the state walkeri 



Palp entirely black, without rings of white scales 



(Fig. 61)' ' 5 



°). Wing without a trace of spotting; wing length 

 about 3.5 mm. An eastern and southern wood- 

 land species widespread but rarely seen in Illinois 

 barberi 



Wing with delinite darker areas, giving a spotted 

 appearance (Fig. 61); wing length about 5.0 mm. 



12 



