CULEX HESITATOR 319 



female. Abdomen long, slender, enlarged towards apex, eighth segment lobed 

 beneath ; without distinct lateral pale spots ; ciliation long, coarse, not arranged 

 in distinct lateral series, most abundant towards tip. Wings slightly narrower 

 than in the female, the venation nearly the same, the outstanding scales more 

 broadly ovate. Claw formula, 1.1-1.1-0.0. 



Length : Body about 3 mm. ; wing 2.5 mm. 



Genitalia (plate 10, fig. 67) : Side-pieces as long as wide, subspherical, with 

 excavated base; lateral prominence divided, outer limb conical, bearing a rod 

 with sharply hooked tip, a large rounded leaf-like appendage and two coarse 

 setae; inner limb divided, each part bearing a filament with hooked tip, inner 

 branch very short. Clasp-filament large, stout, constricted near basal third, 

 apex enlarged, cleft, hirsute without and bearing a terminal claw and spine. 

 Harpes with inner limb long, slender, tip bent and forming fine comb. Harpa- 

 gones divided, the longest plate narrow, curved, expanded and excavated at its 

 tip. Basal appendages small, elliptical, hairy. Penultimate segment emargi- 

 nate and thickened beneath. 



Mr. Thibault wrote us : 



" I know nothing of their habits, except that all of my specimens were taken 

 in tree-holes and holes in the bank of a bayou here. I took a single male in a 

 buggy along with many Anopheles quadrimaculatus and Culex abominator. 

 Among thousands of Culex abominator taken at dusk along a bayou where Culex 

 peccator was known to occur, I did not get a single specimen. In the tree-holes 

 I took mostly males, and I can not say for such that peccator bites." In his pub- 

 lished account he says : " Found in hollow trees and caves. Abundant in such 

 places, though seldom taken elsewhere. They do not seem to enter houses or bite. 

 I have been unable to find where they breed or secure larvae. Taken from June 

 to October." 



Gulf States of North America. 



Scott, Arkansas, September and October, 1908 (J. K. Thibault, Jr.) ; Scott, 

 Pulaski County, Arkansas, August 11, 1909 (J. K. Thibault, Jr.). 



CULEX HESITATOR Dyar & Knab. 



Culex hesitator Dyar & Knab, Journ. N. Y. Ent. Soc, xv, 205, 1907. 

 Culex hesitator Busck, Smiths. Misc. Colls., quart, iss., lii, 69, 1908. 

 Culex hesitator Theobald, Mon. Culic, v, 615, 1910. 



Origixal Description of Culex hesitator: 



$. Proboscis moderately long, very slightly broadened towards apex, black scaled; 

 palpi short, black; occiput clothed with recumbent whitish scales and with erect 

 black forked ones; mesonotum uniformly rich brown with slight bronzy luster; 

 pleura very pale brownish with an indistinct dark longitudinal shade; metanotum 

 pale grayish brown: abdomen depressed, truncate at the tip, black scaled above with 

 coppery and greenish luster, marginal hairs of the segments pale yellow, lateral 

 white basal spots present, those on the terminal segments largest, venter black, with 

 distinct white basal bands; legs dark with bronzy luster; wing-veins uniformly 

 brown scaled; claws simple. Length, 3 mm. 



J'. Palpi much longer than the proboscis, the last two segments projecting be- 

 yond it, brown scaled, not ringed; antennse densely plumose; abdomen with basal 

 silvery-white bands above, broadest on the fourth and fifth segments and much pro- 

 longed on the sides on the sixth and seventh segments. Length, 3.5 mm. 



Seven specimens. Las Cacadas, Canal Zone, Panama (August Busck, collector), 

 bred from pupae captured in a small swampy stream. 



Type. No. 10872, U. S. National Museum. 



Allied to Culex extricator Dyar and Knab, but the banding of the abdomen beneath 

 differs. 



Description of Female and Male of Culex hesitator (Larva Unknown) : 



Female. Proboscis moderately stout, somewhat expanded towards tip, 



labellas conically tapered; vestiture black with a blue reflection, the labellae 



paler with small outstanding setae. Palpi short, one-fifth as long as proboscis, 



