16 PROCEEDINGS OF THE NATIONAL MUSEUM VOL. 120 
48. (47) External process gradually tapering to a point, with a ea bulge on 
the middle of the inner surface... . Ren or gy 49) 
External process very broad on the apical Faun cet tete, denne 
49. (48) External process evenly tapered to a pointed ae restricted to the 
Neotropical region . . . ak .SRREO 
External process with a promtineas nab wishes on chen inner surface; 
restricted to the Nearctic region . . . . . . . salinarius 
50. (49) Basal process rather robust, pointed; eae ab most to the middle 
of the median process of the mesosome . . . 2 SO 
Basal process robust basally, but long and lender emcee ; reaching 
almost to the ventralcornu ... . . . Spinosus 
51. (50) Ventral cornu clavate; basal arm of tiie tenth sternite moderate in 
length, gently curved ..... . .. . archegus 
Ventral cornu dentiform; basal arm ine the tenth sternite very long, 
prominently recurved. . . Wo doi bea, Seidolesaua 
52. (47) Basal process bluntly rounded cistally, bw heyts seri ‘) a RSS 
Basal process sharply pointed distally, occasionally wit an auxillary 
point directed posteriorly .... ... . . . bickleyi 
53. (52) Median process of the mesosome with about 10< or more teeth. . . 54 
Median process of the mesosome with about seven or less teeth . . 55 
54. (53) Apical lobe of the basistyle with three hooked rods, a hooked seta, a 
straight seta, and a leaf. . . . . .renatoi 
Apical lobe of the basistyle ata one apie ro ao hogkeed rods, a 
hooked seta, a straight seta, andaleaf. ... .. . .mauesensis 
55. (53) External process normal in size or greatly reduced, gradually tapered 
to a posteriorly directed point. . . . . je, RG 
External process large, evenly bent on ine one fourth so that the 
apical point is directed laterally ... . setts S4.Jygrus 
56. (55) Apical lobe of the basistyle with three Hooleeds nade, a hooked seta, a 
straight seta, and a leaf; ventral cornu dentiform .. . 57 
Apical lobe of the bacicile with one blunt rod, two hoaleed rods, a 
hooked seta, a straight seta, and a leaf; ventral cornu clavate. 
pinarocampa 
57. (56) External process of the mesosome greatly reduced and lightly chitinized; 
hooked accessory seta on the Pai lobe of the basistyle a complex 
flattened filament ..... cn esS 
External process of the mesosome atsial in size eal nerriella chitin- 
ized; hooked accessory seta on the apical lobe of the basistyle a 
carla hooked structure... . . . . . erythrothorax 
58. (57) Individual teeth of the median neers slightly curved, robust, and 
having somewhat convex sides ... . P . . . .declarator 
Individual teeth of the median process not cur veal the sides straight 
and directed to asharp point ............ . .bidens 
Larval Characters Distinguishing the Subgenus Culex in the New World 
1. Labrum not produced in front; mouthbrushes not thickened and 
in a compact lateral group (fig. 2a). 
The predaceous subgenus Lutzia is characterized by having the 
labrum produced in front, strongly developed, and possessing stout 
denticles; mouthbrushes are thickened and inserted in a compact 
group laterally (fig. 26). 
