310 MOSQUITOES OF NORTH AMERICA 



and large tuft at outer fourth ; three long setae, a short one and a digit at tip. 

 Mental plate small with a large prominent central tooth and seven small ones on 

 each side, the last one remote. Mandible quadrangular ; three filaments before 

 tip ; an outer row of cilia from a collar which is prolonged inwardly toward basal 

 articulation ; a row of rounded conical prominences within outer margin, each 

 bearing a long tuft of feathered hairs ; dentition of a single tooth with two stout 

 spines below; two filaments and a row of feathered hairs within; process below 

 thick and curved basally, angled just below dentition, tip widely furcate, lower 

 limb with a small process beneath, two rows of hairs and a tuft on each limb; 

 basal angle very slight with a row of hairs within and another at base. Maxilla 

 elongate, rounded at tip, divided by a suture; inner half with a row of long 

 spines on margin, a row of short ones within and a line of cilia near base ; a row 

 of long hairs at tip running down along the suture ; outer half with two small 

 filaments below the middle. Palpus small with four long irregular digits. 

 Thorax rounded, wider than long. Abdomen moderate, anterior segments 

 shorter; lateral hairs in fives on first segment, in threes on second, in twos on 

 third to fifth, a single long one on sixth ; skin smooth. Air-tube long, straight 

 except at base, nine times as long as wide; pecten rather long, running to basal 

 fourth, the teeth simple ; four small single hairs beyond pecten. Lateral comb of 

 eighth segment of many spines in a triangular patch; single spine elongate, 

 widened at tip, with an apical fringe of spinules. Anal segment twice as long as 

 wide, ringed by the plate; dorsal tuft of two long hairs on each side; ventral 

 brush moderate, confijied to the barred area. Anal gills short, about half as long 

 as the segment, roimdedly tapered. 



The larvae live in hollow trees and similar locations. Mr. Eusck got them in 

 hollow trees and Mr. Urich in bamboo-joints. The eggs are laid in raft-shaped 

 masses floating on the surface of the water. 



West Indies : Trinidad and Lesser Antilles. 



St. Joseph, Trinidad, June 15, 1905 (A. Busck) ; Montserrat, Trinidad, June 

 39, 1905 (A. Busck) ; Tobago Island, July (A. Busck) ; Fort de France, Mar- 

 tinique, July 20, 1905 (A. Busck) ; Trinidad (F. W. Urich). 



CoqiiiUett identified the present species as Aedes perturhans WilUston, and 

 created for it the genus Isostomyia. We are informed by F. W. Edwards that 

 the species described by Williston as Aedes perturhans is a sabethine. Conse- 

 quently Coquilletf s identification is in error, the species before us being a Culex. 

 The name Isostomyia, although based as a Culex, must follow its alleged type 

 and becomes a sabethine genus (see page 187). Cuiex conservator and Culex 

 divisor were described from larvae supposed to differ in the number of lateral 

 hairs on the abdominal segments. A re-examination shows that an error of 

 observation was made in one ease and that the larvae are really aUke. The 

 description imder Culex divisor is correct and should apply to both. The erec- 

 tion of a separate genus for this species, on account of the short palpi of the 

 male, seems to us to be unwarranted. 



CULEX CHRYSONOTUM Dyar & Knab. 



Culex chrysonotum Dyar & Knab, Proc. U. S. Nat Mus., xzxv, 57, 1908. 

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



ObIGINAL DESCErPTION OF CtlMIS CHBYSONOTUM : 



Female. — Proboscis black-scaled, rather long, gradually enlarged toward the apex; 

 palpi black-scaled, with a few metallic scales at the apices; occiput clothed with 

 golden scales, becoming brownish at the sides, margins of the eyes whitish-scaled; 

 mesonotum clothed with narrow golden scales, the posterior portion dark brQwn- 

 scaled, two golden lines extending from the golden area backward to the scutellmn 

 on each side of the antescutellar bare space; scutellum golden-scaled; pleura with 

 whitish scales; abdomen depressed, blunt at the apex, dark-scaled, with strong 



