CTJLEX CAUDELLI 395 



front margin obtusely arcuate. Antennae long, slightly curved, thick and well 

 spined on basal two-thirds with a large tuft from a notch ; two long setse before 

 tip, a long seta, a short one and digit on a pedestal at tip. Upper pair of dorsal 

 head-hairs double, lower pair single; ante-antennal tufts multiple. Mental 

 plate small, triangular, with a large, stout basal tooth and five on each side, last 

 one small and remote. Mandible quadrangular; three filaments and a tuft of 

 hairs before tip; an outer row of cilia from a long collar; a row of transverse 

 rounded prominences well within outer margin, each bearing a row of short 

 hairs and a single long one ; dentition of two teeth on a slight process with a row 

 of stout spines below; a long, smooth filament and row of feathered hairs 

 within; process below almost in line with outer margin, deeply but obscurely 

 furcate, with a longitudinal row of hairs and tuft at tip of each limb ; basal 

 angle narrow and prominent, row of hairs withia in line with, and approxi- 

 mate to basal hairs. MaxiUa elongate, bluntly roimded at tip, divided by a 

 suture; inner half with a row of spines on margin which are long beyond middle 

 and at base, two short rows of cilia within ; a row of long hairs at tip running 

 down along suture ; outer half with two filaments at basal third preceded by a 

 group of fine hairs. Palpus very short, rather stout, with four long digits. 

 Thorax roxmded, wider than long. Abdomen moderate, the anterior segments 

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

 third to sixth ; subdorsal hairs stellate ; tracheee very narrow ; skin pilose. Air- 

 tube conically tapered, straight before and arcuate behind, three times as long as 

 vride; pecten of long spines reaching to basal two-fifths; single spine sharply 

 and deeply serrate on one side ; eight long tufts on posterior margia, decreasing 

 in lengtii towards tip ; an apical pair of recurved hooks. Lateral comb of eighth 

 segment of about fifteen scales in a curved row ; single scale thorn-shaped, with 

 veiy obscure lateral spinules. Anal segment much longer than wide, ringed 

 by the plate ; dorsal tuft of two long hairs and a short one on each side ; ventral 

 brush well developed, confined to the barred area. Anal gUls long, tapered to 

 a blunt point. 



The larvae live in ground-pools. Mr. Elnab got them in holes made by horse's 

 feet in mud at the margin of a swampy area of a river. There were no habita- 

 tions near. The larvae lie on their backs on the bottom. Color light grayish ; 

 head slightly darker; tracheae very narrow; gills very long and tapering to a 

 point; head and thorax large and broad; mouth-tufts pale grayish. 



Mexico. 



Santa Luerecia, State of Vera Cruz, June 21, 1905 (F. Knab). 



CULEX CAUDELLI (Dyar & Knab). 



Mochlostyrax caudelli Dyar & Knab, Journ. N. Y. But. Soc, xiv, 223, 224, 1906. 



ObIGINAL DeSCEIPTION of MOCHLOSTyBAX CAUDELLI : 



The upper epistomal tuft has three hairs, lower three, the small tuft below eight 

 hairs, the anteantennal tuft five hairs. Air tube straight or slightly concave before, 

 curved behind, with a pair of hooks at the tip. Pecten very long, not reaching half 

 way along the tube; seven tufts on the posterior edge, the two within the pecten 

 longest, the rest successively shorter; a single tuft on the side of the tube. Comb of 

 sixteen bar-like spines in a straight row. Anal segment with complete chitinous 

 ring, the gills very long, tapered. The body is without spicules. 



Mr. Busck collected the specimens in a rather large pool in a palm swamp far 

 from civilization at Arima, Trinidad. He says : " the larvae are weakly looking small 

 fellows, which lie on their backs with jaws upward and open. They feed on very 

 minute animal life (Crustacean) which abounds in these pools; observed this habit 

 both in nature and in captivity and bred so few (five specimens) because the rest 

 died when the Crustaceans gave out." 



The adults were named " Melanoconion atratus Theob." by Mr. Coquillett. We 

 have [named] it for Mr. A. N. Caudell, our friend and co-worker. 



