326 A Monograph of Culicidae. 



form, yet they are readily separated by the conspicuous 

 linear, oblique, setaceous lobe at the base of the first clasp 

 segment, and in particular by the conspicuous prolongation 

 of the inner ventral wall into a tapering process with 

 rounded extremity, which nearly meets the one arising on 

 the opposite segment. The narrow setaceous lobe has a peculiar 

 curved spine at its lateral extremity, and its posterior margin is 

 thickly clothed with stiff setae. Yentral surface of the con- 

 spicuous basal lobe also thickly clothed with setae, and its apex 

 bears a thick brush which intermingles with that arising from 

 the process on the opposite side." 



The larva has been described by E. P. Felt and J. B. Smith. 



Its head is dark brown ; antennae pale brown, darker at tip 

 and with scanty tuft arising before the middle of the joint. 

 Labial plate triangular and toothed as shown in Felt's figure 



Fig. 116. 

 Labial plate of C. subcantans (after Felt). 



reproduced here. Anal segment with broad dorsal plate, extend- 

 ing nearly to the ventral line but not enclosing the segment. 

 Siphon nearly cylindrical, tapering slightly and with double row 

 of pecten, each terminated by a branched hair, pecten with three 

 prominent and several smaller serrations. Comb consists of a 

 somewhat irregular patch of scales arranged in about three rows, 

 each scale being somewhat spatulate and tipped with numerous 

 fine hairs and a terminal coarser spine. Number of comb scales 

 varies from twenty-eight to thirty-two according to Felt. There 

 is evidently some confusion in regard to this larva, for Dyar, 

 Smith and Felt's figures do not agree. 



The figures reproduced here are Felt's, as they agree in every 

 way with the specimens he sent me of adults and larvae. 



Habits- and life-history. — According to Dr. Dyar it flies most 

 of the summer, but occurs as one generation only. Professor 

 Felt says the larvae survive the winter, but Dr. Dyar states that 



