(3(3 MISC. PUBLICATION 336, U. S. DEPT. OF AGRICULTURE 



35. Wing scales brown and white mixed ; first hind-tarsal segment with a 



pale ring in middle. Important salt-marsh species Aedes sollicitans 



Wing scales entirely dark, first hind-tarsal segment without a central 



pale ring. A fresh-water breeder, usually rare Aedes mitchellae 



(Aedes nigromaculis, reported once from Louisiana, is similar to 

 sollicitans except that the base of vein 1 and the outstanding 

 scales on the basal naif of vein 4 are largely white-scaled, whereas 

 these veins are largely darked-scaled in sollicitans.) 



36. First hind-tarsal segment ringed in middle or largely pale 37 



First hind-tarsal segment without a central ring. A West Indian 



species, recorded once from Florida (Key West)_ Psorophora pygmaea 



37. Legs and wings black-scaled, speckled with white, but wings without 



well-defined areas of pale scales ; first hind-tarsal segment dark, 

 ringed with white in middle and at base ; mesonotal scales dark, well 

 sprinkled or frosted with white. A fairly large, blackish species, 



common in the Southern States Psorophora columhiae 



Costa and veins with well-defined areas of pale scales ; tibiae and first 

 hind-tarsal segment largely pale-scaled, intermixed with dark and 

 ringed with dark scales apically 38 



38. Wing costa with a spot or area of pale scales at base and one at tip of 



subcostal vein, remainder of costa dark intermixed with white; anal 

 vein with apical third dark-scaled, basal portion pale ; wing fringe 

 without pale spots. [Vein 3 with apical half and base dark-scaled, 

 separated by a spot of pale scales ; anterior fork of vein 4 and both 

 forks of vein 5 pale centrally.] Rare southern species 



Psorophora discolor 

 Apical half of costa with two prominent dark spots separated by a 

 longer pale spot; anal vein with pale scaling apically and basally, 

 separated by a spot of dark scales at about apical third ; pale fringe 

 spots present opposite tips of all longitudinal veins. Recorded only 

 from Arkansas in the Southeastern States Psorophora signipennis 



39. (28) Tarsal pale scaling restricted to one or more of last three seg- 



ments of hind tarsi. [Abdomen blue-black, the tergites with apical 

 or lateral pale scaling ; mesonotum with broad appressed pale scales, 

 mixed with the dark scales or segregated at sides.] 



Psorophora (Janthinosoma, except P. cyanescens) 40 

 Tarsi entirely dark or the pale scaling not restricted to apical seg- 

 ments of hind tarsi. [Dorsal segmental pale scaling of abdomen 

 basal when present] 42 



40. Last two segments of hind tarsi white 41 



Fourth segment of hind tarsi white, at least dorsally, the fifth seg- 

 ment dark. [Mesonotum dark in center, sides covered with broad 

 white scales (fig. 12, G).] Usually rare. (Formerly known as 

 Psorophora discrucians) Psorophora varipes 



41. Mesonotum covered with a mixture of brown and broad white scales. 



[Hind tibia and tarsus with erect scales ; tarsal markings usually ex- 

 tending onto tip of segment 3.] Common woods species, the white- 

 footed mosquito. (Formerly known as Psorophora sayi) 



Psorophora fcrox 

 Mesonotum dark centrally, the sides covered with broad yellowish- 

 white scales. Rare Psorophora horrida 



42. Medium-sized species ; mesonotum with a vestiture of narrow-curved 



or hairlike scales. [Metanotum without setae; abdominal tergites 



with pale bands or lateral spots on the segments.] 43 



Very small species, mesonotum covered with broad, appressed, dark 

 scales ; some of midtarsal segments white for entire length on one 

 side, but tarsal markings sometimes very indistinct ; abdominal scales 

 entirely dark dorsally and pale ventrally, the two colors meeting at • 

 side in a straight line. [Metanotum with a tuft of setae; dorso- 

 central bristles of mesonotum absent ; anterior pronotal lobes large, 

 covered with flat scales; tip of abdomen blunt and more or less ex- 

 panded; palpi short in both sexes.] Genus Wyeomyia 59 



43. Tarsi ringed with white . <H 



Tarsi not ringed with white 52 



