18 PROCEEDINGS OF THE NATIONAL MUSEUM VOL. 120 
2. Apical bristle of air tube absent or, if present, straight and 
without a basal tooth (fig. 2c). 
The subgenera Melanoconion and Mochlostyraz exhibit a strongly 
curved or hooked apical bristle which has one or two small teeth or 
hooks near its base (fig. 2d). The subgenus Aedinus possesses a 
gently curved apical bristle on the air tube which may have one small 
barb near its base (fig. 2e). 
3. Ventral brush of the anal segment without detached hairs proxi- 
mad of the grid (fig. 2f). 
The subgenus Neoculex possesses a ventral brush with one or 
more hairs proximad of the grid, on the saddle or between the saddle 
and the grid (fig. 29). 
4. Prothoracic hair 3-P of the same order of magnitude and thick- 
ness as 1-P (fig. 2h). 
In the subgenera Carrollia and Microculex prothoracic hair 3-P 
is much thinner and shorter than 1-P, or both 1-P and 3-P may be 
multiple (fig. 27). 
Key to Species of New World Culex (Culex) Based on the Larvae 
ile Antennae of uniform shape, antennal tuft located near the middle . 2 
Antennae constricted beyond the antennal tuft; antennal tuft generally 
inserted near ithe outer third...) Gh A ee 
2. (1) Siphonal tufts not arranged ina line. ........ . .corniger 
Siphonal tufts arranged inaline. ... . . . . janitor 
3. (1) Pecten spines exceeding at least the Basal half of the siphon. . . .4 
Pecten spines restricted to the basal third of the siphon... . .5 
4. (3) Siphon with all tufts of setae located on the distal half; siphonal tufts 
Very long 5 ee . . . . .bonneae 
Siphon with five ainnonel tutes! areanced in a row exec for the sub- 
apical tuft; the siphonal tufts normal in length . . . . interrogator 
5. (3) Siphon aaibone strong apical spines (siphonal spicules may be present). 6 
Siphon with strong apicalspines ......... .. .coronator 
6. (5) Siphon pubescent. .... oe GH Le er 
Siphon glabrous or minutely ppieniaioe Pelee a 
(2 (6) Analigilis four; mormaliics 2... on fla wo A os 
Two thick, bulbous anal gills presen +. ns 2s . 2 bahamensis 
8. (7) Siphonalindex 5.0 or greater; pubescence conspicuously longer and more 
dense at the apex of the siphon ... . . . . . Maracayensis 
Siphonal index less than 5.0; pubescence nee conspicaannie longer or 
more dense at the apex of te siphon. .... . . . .saltanensis 
9. (6) Thorax minutely spiculate. .. . Me enhs Mi | 10) 
Thorax glabrous (the thoracic me euncati oe ister ermanleee) sail 
10. (9) Five or more siphonal tufts beyond the pecten: <..e.\ih) Ae eee 
Four or less siphonal tufts beyond the pecten. . . . , eee ERS 
11. (10) Apical and subapical pecten teeth not separated from ine other pecten 
teeth; anal segment clothed with minute spicules . .... . .12 
Apical otal occasionally subapical pecten teeth separated from the ophee 
pecten teeth; anal segment clothed with minute setae . . chidesteri 
