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MISC. PUBLICATION 336, U. 8. DEPT. OF AGRICULTURE 
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 columbiae 
Costa and veins with well-defined areas of pale scales; tibia and first 
hind-tarsal segment largely pale-scaled, intermixed with dark and 
ringed “with dark scales-apically2 == oss iene ie een 
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 area; 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 
. (29) 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 ) 
Tarsal pale scaling not restricted to apical segments of hind tarsi or 
tarsi entirely dark. [Dorsal segmental pale scaling of abdomen 
basal when present. ]_—— ws SOS EF Cio Sep eee. Sees, oe ene 
Last two segments of hind tarsi white___ Lees a TRS aes Aa eae 
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 
PSOTOPNOTacUtscruGins) == eee Psorophora varipes 
Mesonotum covered with a mixture of brown and broad white seales. 
[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 feror 
Mesonotum dark centrally, the sides covered with broad yellowish- 
white Scales: Rares 258s Ses Se es ee Psorophora horrida 
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 4) 2 es Be ee 
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.]_-_ A Genus Wyeomyia 
> (Larsic ringed wath) -wlilt@ 2 ere sake ee eee eee EFS fe? 5 aS Soe 
Tarsi not ringed with white Le ee tpacdes tee eee oa Tee 
Mesonotum with delicate longitudinal lines of white or silv ery scales__ 
Mesonotum without such lines_________ JADA RSET Ae REISS ZAC SG ote 
Thorax with four ees Supt the outer pair curved to form a lyre- 
shaped marking (fig. A); outstanding wing scales narrow and 
dark. [Hind tarsi at 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“MOSGUILO. Ve es oS ae ee eS ee ee Aedes aegypti 
Mesonotum with four long silvery lines, and four short lines posteriorly, 
not in shape of lyre (fig. 12, J); 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 
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