AQUATIC INSECTS IX NEW YORK STATE 40t 



The hypopharynx (not shown in the figure), is tonguelike, and 

 lies imiuediately dorsad of the labium on the floor of the mouth 

 cavity. It is about as wide as the toothed portion of the labium, 

 its anterior margin provided with a fringe of pale, short, finger- 

 like procesises, which barely project beyond the edge of the 

 labium when viewed from below, and is not visible without dis- 

 section. 



The thorax [fig.l] is transversely oval, not as wide as the 

 head, with the three segments quite distinct. On the lateral- 

 margins of each segment are a few tufts of long laterad pro- 

 jecting setae, those on the second and third segments being 

 longer and more numerous than those of the first, and inserted 

 at the tips of fingerlike processes. 



The abdomen [fig.l] is nine segmented with long setae on the 

 margins; the setae of the anterior segments being longer than 

 the posterior ones. The tufts of setae of the first and second 

 abdominal segments are inserted on lobular processes like those 

 of the thorax. The eighth segment is shorter than thoise preced- 

 ing it; the ninth is slender and cylindric, and makes an angle 

 with the long axis of the body. At its apex are four small 

 blood or tracheal gills, dorsad of which are a pair of long setae, 

 and ventrad, a tuft of them. 



Projecting from the caudal margin of the dorsal surface of the 

 eighth segment is the breathing tube, a cylindric tube, as long 

 as, or longer than any abdominal segment, its diameter being 

 less than half its length. At the apex of the tube are several 

 setae, and triangular flaps to cover the aperture. 



The color of the head is brown, that of the thorax and abdo- 

 men grayish with white incisures. On the dorsal surface of 

 each abdominal segment, surrounded by the whitish field and 

 caudad of the incisure, is an oval, brownish spot. [See fig.l] 



Pupa. The pupa [fig.lO] resembles that of Culex, but differs 

 from it and from other Culicidae known to me, in lacking the 

 broad swimming paddles. In place of them, there are two pointed 

 processes, each with three spines at the apex and a single one 

 laterally near the middle. The breathing trumpet as in Culex,. 

 the plane of the margin being quite oblique, but on the rim of the 

 inner side is a little rounded projection. Each abdominal seg- 

 ment has several pairs of setae, the median pair quite stout, the 

 intermediate pair very short and slender and the one or two 

 laterals long and very delicate. In addition to the laterals,, 

 there is a longitudinal lateral fringe of very delicate hairs, and 

 the lateral margin is serrate. 



Imago. This has already been well described by Mr D. W. 

 Coquillett; and the description is reproduced below. 



