68 
MISC. PUBLICATION 336, U. S. DEPT. OF AGRICULTURE 
9. Proboscis normal, straight or only slightly curved, not tapered. [Scutel- 
lum tYrilobed and with separated tufts of setae.]_~_-___ Tribe Culicini 
Very large iridescent species of striking appearance ; proboscis rigid, 
the outer half tapered and sharply curved downward (fig. 2, A). [Fe- 
male palpi one-half or two-thirds as long as proboscis; second mar- 
ginal cell less than half as long as its petiole; scutellum evenly 
rounded and scaled.] Rare tree-hole breeders 
Tribe Megarhinini, genus Megarhinus 
10. Front tarsi of male entirely dark. [Mesonotum dark, with a median 
line and a border of white or yellowish scales; abdomen dark blue 
above, yellowish below; palpi and legs with iridescent blue reflections ; 
female tarsi of front and middle legs with second, third, and part of 
fourth segments white; hind tarsi with fourth and most of fifth 
segments white; male with fourth segment of hind tarsi pale and 
second segment of middle tarsi pale on one side, or dark; front tarsi 
dark.] Occurs sparingly in most of the South 
Megarhinus septentrionalis 
Female very similar to above; male also similar except that second 
and part of third segments of front and middle tarsi are pale dorsally. 
Very rare, Florida and Georgia__________________Megarhinus rutilus 
11 
10 
FIGURE 18.—Wing of Uranotaenia, showing relation of length of the second mar- 
106 
12. 
13. 
14. 
ginal cell (0) to its petiole (a) ; also the short anal vein (an). 
Second marginal cell normal, as long as or longer than its petiole; mostly 
medium-sized or large species, or, if small, without lines of bluish 
Scales: OD) thorax. 20 = see So ee ee ee ee ee ee 
Second marginal cell less than half as long as its petiole (fig. 18) ; very 
small species with lines of bluish or purplish scales on thorax and on 
base of vein 5. [Anal vein short, ending before level of fork of vein 
5; squamae bare; palpi short in both Sexes. ]__-___ Genus Uranotaenia 
Mesonotum with a narrow median longitudinal line of bright bluish 
seales (fig. 12, J); tarsi all dark. A common species 
Uranotaenia sapphirina 
Mesonotum dark above, with a short line of purple scales on lateral 
margin; patches of pale purplish scales on sides of thorax and on 
anterior pronotal lobes; apex of third and entire fourth and fifth 
hind-tarsal segments white. Common in Florida and southern Loui- 
STAM Aaa Ss SOE ee ee ee ee 2 _  _ Uranotaentastowin 
Tarsi not ringed with white and ‘mesonotum without distinet mark- 
ings’ (except small white dotsun' CC, ;estuans) =e eee 
Tarsi with pale markings or mesonotum marked with bicolorous sealing 
in 2definite- patterns (lines or patches) =e ee eee 
Antennae normal, not longer than proboscis, first flagellar segment of 
about, same lengthy as succeed igs OMe ge ee ee 
Antennae much longer than proboscis, with a very long first flagellar 
segment, equal in length to several of succeeding ones. [Tip of ab- 
domen somewhat appressed laterally, making height equal to width; 
sternopleural sclerite almost completely covered (shingled) with dark 
appressed scales; mesonotum with hairlike scales; palpi and antennae 
similar in both sexes.] The crab-hole mosquito, found in coastal areas 
of southern: Mlorid ass ees ae a eee Deinocerites cancer 
5. Tip of abdomen blunt (fig. 17, B), eighth segment visible, the cerci 
retracted or inconspicuous ; mesonotum covered with narrow lanceolate 
scales or with hairlike scales (if very small species, covered with 
13 
12 
14 
26 
15 
