INSECUTOR INSCITI.^ MENSTRUUS 119 



DESCRIPTIONS OF HITHERTO UNKNOWN 

 LARV^ OF CULEX 



{Dipt era, Ciilicidce) 

 By HARRISON G. DYAR and HARVEY P. BARRET 



Five species of Culex recognized from the United States are 

 unknown in the larval state. We are able to make known one 

 of these herewith. 



Culex peccator Dyar & Knab. 



Head broad and transverse, bulging on the sides, marked 

 with black in a large patch on the posterior angle and a smaller 

 patch before antenna. Antennae large, slightly swollen on the 

 basal two-thirds, the apical third narrower, a large multiple 

 tuft at the notch; two of the terminal setse very long; basal 

 two-thirds white, stained with brown at base, outer portion 

 brown. The antennae when projected forward are consider- 

 ably longer than the head, distinctly spipose. Head hairs, 

 upper a small tuft of about eight, fine and short ; lower long, 

 single, stout ; anteantennal tuft multiple, coarse and feathered. 

 Skin of the body distinctly pilose. Lateral comb of the eighth 

 segment of about 14 scales in a double row, becoming single 

 below, the single scale pointed, thorn-like, not feathered. Air- 

 tube straight, tapering toward base, about six times as long as 

 wide, glabrous ; pecten of about 12 teeth on basal third of tube, 

 followed by five paired tufts in a straight line, multiple and 

 diminishing somewhat in length outwardly ; tube slightly flared 

 at the tip. Anal segment longer than wide, pilose, ringed by 

 the plate. Anal gills moderate, about as long as the segment. 



The larvae were found beneath the overhanging bank of a 

 stream at the head of an artificial lake, also in small pools in 

 marshy ground at the head of the lake. At this point there 

 was very little perceptible current in midstream and practically 

 no current at the edge. The banks were jagged and afforded 

 many small harbors for lodgment of the larvae. The larvae 

 were present in only fairly large numbers and were associated 

 with C. saxatilis Grossb. Superficially they resemble C. saxa- 



