Carpenter et al.: Mosquitoes of Southern U. S. 131 



its petiole. Tip of abdomen more or less pointed, the eighth segment retractile. 

 Male Termmalia: Phallosome variable in the different subgenera. Claspette and 

 dististyle very diversified in form. Tenth sternite similar to that of Aedes. 

 Basal and apical lobes of basistyle absent. Larva: Anal segment completely 

 ringed by the dorsal plate; the dorsal plate pierced on the mid-ventral line for 

 nearly its entire length by tufts of the ventral brush. Siphon with a single pair 

 of subventral tufts, never inserted basally, often reduced in size. Comb of 

 eighth segment present. Mouth brushes prehensile in the subgenus Psorophora. 

 Antenna long in the subgenera Janthinosoma and Grabhamia. 



Key.s to the Species 



adult females 



1. Wings with mixed dark and white scales; hind femur with a narrow subapical 



ring of white scales, more or less distinct (subgenus Crahhamia) 2 



Wings entirely dark scaled or with only a few inconspicuous white scales distrib- 

 uted on costa and subcosta ; hind femur without a subapical ring of white scales... .5 



2. Segment 1 of hind tarsus with a white ring at middle or largely pale 3 



Segment I of hind tarsus entirely dark scaled, except for a few pale scales in a 



narrow basal ring p^gmaea (Theob.), p. 160 



3. Wings speckled with white scales in no definite arrangement; segment I of hind 



tarsus ringed at base and at middle with white scales ....confinnis (L. Arr.), p. 153 

 Wings with definite areas of white and dark scales; segment 1 of hind tarsus 

 largely pale scaled 4 



4. Apical half of costa with two conspicuous spots of dark scales separated by a 



longer area of white scales; apical third of vein 6 white-scaled; scales of 



wing fringe arranged in alternately dark and pale groups 



- - signipennis (Coq.), p. 162 



Costa with a streak of white scales at base and at point of union with subcostal 

 vein, the remainder of costa dark, speckled with white; apical third of vein 6 

 dark scaled; scales of wing fringe uniformly dark discolor (Coq.), p. 156 



5. Hind legs, including apices of femora, very shaggy, with long erect scales; 5th 



segment of hind tarsus never entirely white; scutum with smooth nude areas 



anteriorly and submedially; very large species (subgenus Psorophora) 6 



Hind legs not markedly shaggy, the apices of femora without erect scales (if 

 tibiae are somewhat shaggy, the 5th segment of hind tarsus is entirely white 

 scaled) ; scutum without smooth nude areas, although sometimes sparsely 

 scaled; moderate sized species (subgenus janthinosoma) 7 



6. Scutum with a narrow median longitudinal stripe of golden scales; proboscis 



yellow scaled at outer third, dark at tip ciliala (Fabr.), p. 133 



Scutum with only dark scales medially, without a longitudinal stripe of golden 

 scales; proboscis entirely dark scaled horvardii Coq., p. 136 



7. Hind tarsi entirely dark scaled; abdominal segments apically with submedian 



triangular patches of golden scales cpanesceri5 (Coq.), p. 139 



Hind tarsi with white markings on apical segments; pale scaling of abdominal 

 segments restricted to lateral apical corners or narrow apical margin, never in 

 submedian triangular patches 8 



8. Segment 4 of hind tarsus white scaled, at least on one side, segment 5 dark; 



scutum with a broad median longitudinal stripe of dark scales, dingy white or 



yellowish scaled laterally varipes (Coq.), p. 150 



Both segments 4 and 5 of hind tarsus white scaled, and often the tip of segment 

 3 ; scutum either with or without a median longitudinal dark stripe 9 



9. Scutum uniformly covered writh mixed dark-brown and golden-yellow scales 



ferox (Humb.), p. 142 



Scutum with a broad median longitudinal stripe of dark bronzy-brown scales, 



broadening posteriorly, pale-yellow or dingy-white scaled laterally 10 



