THE MOSQUITOES OF THE SOUTHEASTERN STATES (37 



44. Mesonotum with delicate longitudinal lines of white or silvery scales— 45 

 Mesonotum without such lines 47 



45. Thorax with four silvery lines, the outer pair curved to form a lyre- 



shaped marking (fig. 12, A) ; outstanding wing scales narrow and 

 dark. [Hind tarsi with wide contrasting basal white bands, last two 

 segments largely white; front and middle tarsi with narrow basal 

 bands or spots on first two segments, the others dark.] The yellow- 

 fever mosquito Aedes aegypti 



Mesonotum with four long silvery lines, and four short lines posteriorly, 

 not in shape of lyre (fig. 12, /) ; wing scales broad, mixed with 

 white. [Hind tarsi with broad basal and apical bands; femora 

 sprinkled with white; tibiae and proboscis with longitudinal lines of 

 white scales ; fourth segment of fore tarsi very short ; wing with a 

 white spot extending across the veins from the stem of vein 2 to 5.1, 

 and base of anal vein white ; spiracular and postspiracular bristles 

 absent; posterior pronotum with two to five bristles.] Rare, tree- 

 hole breeders Genus Orthopodomyia 46 



46. Tergite of second abdominal segment with continuous black scaling 



apically ; integument of segment 1 brownish__ Orthopodomyia signifera 

 Tergite of segment 2 almost entirely pale-scaled, extending to the apex 

 in middle of segment ; integument of segment 1 yellowish 



Orthopodmyia alba 



47. Tarsal segments ringed only basally 48 



Hind-tarsal segments ringed basally and apically; last hind-tarsal 



segment entirely white 50 



48. Tarsi with very narrow basal bands, those on hind tarsi usually no 



wider than diameter of segment; basal abdominal pale bands with a 

 V-shaped notch in middle of posterior margin on some segments ; wing 

 scales narrow, entirely dark. Rare in Florida, frequently abundant 



elsewhere. (Formerly known as A. sylvestris) Aedes veocans 



Tarsal segments with broad basal bands; wing scales intermixed with 

 white ; mesonotum whitish on sides, with a median dark stripe 49 



49. Wing scales narrow. Recorded from Mississippi Aedes stimulans 



Wing scales broad. Recorded from Mississippi Aedes grossbecki 



50. Wing scales dark; abdomen dark-scaled dorsally, with basal bands or 



lateral pale spots 51 



Wing scales bicolored; abdominal segments almost entirely pale-scaled 

 except for dark quadrate spots laterally; mesonotum pale, with a 

 median dark stripe of variable width. Reported from Louisiana 



Aedes dorsalis 



51. Mesonotum golden brown, without a median longitudinal dark stripe. 



Occurring sparingly throughout the South Aedes canadensis 



Mesonotum pale, with a well-defined median dark stripe. Recorded 

 from North Carolina and northward Aedes atropalpus 



52. (43) Mesonotum dark brown, with a median longitudinal silvery stripe. 



[Abdominal segments with lateral pale spots.] 53 



Mesonotum without a median silvery stripe 56 



53. Median stripe extending full length of mesonotum, the pale area usually 



narrower (variable in A. dupreei) than the dark area on each side 



(fig. 12, C) 54 



Median stripe ending just back of middle of mesonotum, the silvery 

 area wider than the dark area on each side (fig. 12, B) . [Claspette 

 (harpago) of male terminalia with a flattened filament having one 

 long and several shorter median, retrose spines.] Fairly common 



Aedes infirmatus 



54. Medium-sized species (wing about 3.5 mm) ; occiput with a large median 



area of pale lanceolate scales, bordered by broad, appressed, mostly 



dark scales 55 



Small species (wing about 2.5 mm) ; occiput with a narrow median line 

 of pale, lanceolate scales, bordered by broad pale and dark scales. 

 [Mesonotum of male with a very broad median stripe or entirely 

 silvery-scaled; claspette of male terminalia with a slender stem and 

 filament, the latter slightly longer than the stem and tapered to a sharp 

 point ; stem of claspette with a bristle inserted in a raised tubercle 

 near base.] Aedes dupreei 



