74 MISC. PUBLICATION 3386, U. 8. DEPT. OF AGRICULTURE 
58. Tibiae and tarsi almost entirely dark-sealed; dark portions of femora 
not speckled with white; abdominal tergites with lateral pale spots____ 58 
Tibiae and first segments of tarsi pale on one side for nearly their en- 
tire length; dark portions of femora speckled with white; abdominal 
segments sometimes with basal pale bands that widen laterally. 
[Mesonotum broadly pale-scaled for its full length on each side, the 
disk also with pale scales; posterior pronotum with lanceolate scales. ] 
Rare in Southern States Sea Neat ADO U SPR SS Rs ee Aedes sticticus 
59. Posterior pronotum densely covered with broad, appressed, white scales; 
mesonotum with silvery-white scales along sides, the median area 
broadly dark-sealed (fig. 12, F). A common woods species, breeding 
in®treeNOles ss Se eee ee Ae ee Ee eee ee er ee Aedes triseriatus 
Posterior pronotum with lanceolate scales, not closely appressed ; meso- 
notum with broad patches of yellowish-whiite scales anteriorly, reduced 
to narrow lateral stripes posteriorly by an abrupt widening of the 
median dark-scaled area (fig. 12, D). A fairly large species, usually 
PATE oe Cee eae a ea ee OR Ce IE a arene eae ____ Aedes thibaulti 
60. (43) Hind legs without markings : - segments 3 to 5 of midtarsi white on 
one side. The pitcherplant mosquito, rare______ Wueomyia smithii 
Hind-tarsal segments with basal spots or streaks of white scales under- 
neath; midtarsi as in W. smithii. Two species found in the United 
States only in southern Florida, breeding in the water in air plants 
(Bromeliaceae) .--—_ mies sete oe = foal 
61. Anterior pronotal lobes sily eny-scaledaa2=22=.2 a= _ Wyeomyia vandue eel 
These scales darker, with purplish reflections (difficult to distinguish 
from the preceding) ________ mens ______ Wyeomyia mitchellit 
KEY TO DARK-LEGGED SPECIES OF CULEX BY MALE TERMINALIA ‘ 
1. Tenth sternite with an apical tuft of short bristles or spines; sub- 
apical lobe of sideniece not divided Sa Sevan Subgenus Culex 
Tenth sternite comb-shaped apically, with a row of short, stout teeth___ 
2. Subapical lobe of sidepiece with eight appendages; base of tenth sternite 
produced laterally into a blunt point or a short, nearly straight arm____ 
Subapical lobe with five or six appendages; base of tenth sternite pro- 
duced into: a long; stout. strong lye Curves ait rig eee eee 
38. Ventral arm of mesosomal plate long, ribbonlike, curved sharply out- 
ward toward sidepiece at about the outer third and tapered to a point; 
dorsal arm slender, pointed, lying more or less parallel with the inner 
margin of the ventral arm and extending little if any beyond the curved 
shoulder of this arm_____ eas __ Culex quinquefasciatus 
Ventral arm of mesosomal plate of same general shape as above but some- 
what shorter; dorsal arm broader, semicylindrical in appearance, with 
a truncate, slightly upturned tip; this arm placed obliquely, usually 
extending to or toward tip of ventral arm_________- Culex pipiens 
4. Mesosomal plate with two arms and with a median row or group of four 
to seven short, stout teeth_______ 5 
Mesosomal plate without a median row y of ‘teeth, ‘the processes consist- 
ing of a short lateral arm and a longer posterior arm, which has a 
small tooth near the base. (Subapical lobe of sidepiece with three 
rods, a leaf, and two setae)_______ Culex restuans 
5. Dorsal arm of mesosomal plate short, bent in middle at a right angle 
(thumblike), with a pointed tip; subapical lobe of sidepiece with three 
rods, a leaf, and two setae; spines of tenth sternite all sharp- 
pointed Seimei 380 By eae sat pene pian as: Culex salinarius 
Mesosomal plate with a stout, str aight, dorsal arm from near base; lobe 
of sidepiece with only one seta after the leaf (apieally) ; spines on 
one side of tuft of tenth sternite short and bluntly rounded 
Culex nigripalpus 
6. Subapical lobe of sidepiece with distinct divisions: comb-shaped portion 
of tenth sternite bent inward nearly at right angles; mesosomal 
plate with a long, curved basal arm, directed ventrally (basal hook) 
Subgenus Melanoconion 7 
ere oO ON 
7 Tllustrations of these structures have been omitted, on the assumption of some famili- 
arity with this specialized subject on the part of those using this key. 
3 eae 
a 
7 = et le eS 
