March, 1904 ] DyAR : HiSTORY OF CULEX CANTANS MeIGEN. 37 



micropyle, one side flattened ; finely reticulate, the reticulations elon- 

 gated, the spaces between them depressed to form shallow pits, more 

 prominent at the ends. At the micropylar end is a slight clear 

 cushion. The sculpturing is distinct, apparently not granular, the 

 outline being smooth except just at the ends. Length .8 mm., width 

 .25 mm. The eggs are usually white when first laid, but soon turn 

 deep black. 



In the first larval state (Plate I, Fig. 2), the usual generalized 

 characters are shown. The head is flattened, circular in front, 

 antennae rather long, uniform, with a single hair near the n)iddle, 

 uniformly infuscated. The body is normal, thorax enlarged, ab- 

 dominal segments submoniliform, colorless, the hairs moderate, 

 becoming weaker posteriorly. Air tube long, the outer third infus- 

 cated ; a double row of pecten at base composed of lamellar dentate 

 spines (Plate I, Fig. 4) ; lateral comb of the eighth segment a row of 

 six or eight parallel bar-shaped spines (Plate I, Fig. 3). The anal 

 segment has a small dorsal plate, the usual terminal tuft, but no 

 ventral brush. The four anal processes are normal, large but not 

 inflated nor conspicuously tracheate. 



The second stage shows the usual definite change, although the 

 mature characters are not fully developed. The head is much the 

 same, the antennge still with the tuft about the middle of the uniformly 

 shaped joint. Body as before, the air tube, however, infuscated 

 throughout (Plate I, Fig. 7) and with its pecten teeth modified into 

 the more specialized shape of the adult larva, a spine with small teeth 

 at the base (Plate I, Fig. 6). The anal segment has a larger plate, 

 the ventral brush is present with slight tufts preceding the barred area 

 (Plate I, Fig. 5). The comb on the side of the eighth segment is 

 composed of thorn-shaped spines in a multiple row (Plate I, Fig. 8). 



The third stage hardly differs at all from the second except in size. 

 The spines of the lateral comb are more numerous, but the dorsal 

 plate of the anal segment is still incomplete. 



In the fourth stage the larva is mature. The head is rounded, 

 flattened, mouth brush moderate, antennas uniform, with the tuft at 

 the middle, infuscated (Plate I, Fig. 9) ; the labial plate is broadly 

 triangular, with coarse teeth at the sides, fine ones at the apex. The 

 body hairs are moderate, the thoracic ones multiple, arising from 

 infuscated tubercles but without any distinct posterior spine on the 

 lower metathoracic tuft ; abdominal hair diminishing posteriorly. 



