68 MISC. PUBLICATION 336, U. S. DEPT. OF AGRICULTURE | 
9. Proboscis normal, straight or only slightly curved, not tapered. [Scutel- 
lum trilobed and with separated tufts of setae.]______ Tribe Culicini 11 
Very large iridescent species of striking appearance; proboscis rigid, 
the outer half tapered and sharply curved downward (fig. 2, 4). [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 
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 
ae nee emer: SS ee ea 
rs 
Fiegure 18.—Wing of Uranotaenia, showing relation of length of the second mar- 
ginal cell (0) to its petiole (@) ; also the short anal vein (an). 
11. 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 
SCaleés.0n-PhOrams Se 2 esi Se eee as ee ee ee 13 
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 12 
12. 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- 
SIAN oa 2 ee Se te i ele aig CP obs Lane eee ee ee Uranotaenia lowitt 
18. Tarsi not ringed with white and mesonotum without distinct mark- 
ings (except small white dots!) in C. resiiwans) eee 14 
Tarsi with pale markings or mesonotum marked with bicolorous sealing 
in definite, patterns; (lines ;or patches) = 252 se eee 26 
14. Antennae normal, not longer than proboscis, first flagellar segment of € il 
about, Same lengthaas -SUcCee die 011 Cs mseeeaeen meee mermaesagn eran eng 15 
Antennae mueh 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, SOUEDErN) IOEI Ga ae Oe eee ae ae re ee Deinocerites cancer 
15. Tip of abdomen blunt (fig. 17, B), eighth segment visible, the cerci 
retracted or inconspicuous ; mesonotum covered with narrow lanceolate 
scales or with hairlike seales (if very small species, covered with | 
