INSKCUTOR INSCITI^ MENSTRUUS 177 



genitalia have the lobe of the side piece with three rods, the 

 marginal one shorter, a seta, a leaf -like appendage and another 

 seta; the second plate of the unci is curved, the corners drawn 

 out into stout teeth, the upper one long, the basal one short, 

 one denticule between. When mounted undisturbed, the parts 

 appear enclosed in an elliptical basket or cage, with a bent 

 cross-bar, the sides bidentate. 



Culex brehmei, described by Knab (Proc. Biol. Soc. Wash,, 

 xxix, 161, 1916), proves to be a fallacious species, the adults 

 being restuans, the larvae pipiens, a wrong association having 

 been made by the collector, whose statement was accepted 

 without the proof afforded by isolations. 



The name Culex territans Walker appears to be the oldest 

 name for this species, according to F. W. Edwards of the 

 British Museum ; but Walker's description does not fit this 

 species and the name has long been applied to another species. 

 We therefore drop the name as unrecognizable in order to 

 avoid the confusion that would ensue by its further use. 



9. Culex (Culex) quinquefasciatus Say. 



Culex quinquefasciatus Howard, Dyar and Knab, 1. c, iii, 345, 

 1915. 



This species extends over the whole of the warmer por- 

 tion of the earth, having become dispersed by commerce 

 in former days. Iti the United States it occupies the southern 

 Atlantic seaboard to the District of Columbia, where it is com- 

 mon, but does not extend much farther north. In the Mis- 

 sissippi Valley it probably extends farther. It is absent from 

 the Great Plains and the whole of the west, except in the 

 lower Colorado Valley, having been taken in the Imperial 

 Valley, California, and Yuma, Arizona, as an extension of its 

 range in Mexico, where it is abundant. The species is semi- 

 domesticated in habit, the larvae occurring in numbers in all 

 artificial collections of water about human habitations, less 

 common in the open country in natural pools, but so occurring 

 occasionally. The larva is very close to that of pipiens, differ- 

 ing in the slightly shorter air-tube, with less numerous pecten 

 teeth, and in the presence of single subdorsal hairs on abdom- 



