Decxgcl DyAR: LARV.E OF NORTH AMERICAN CULICID.^. 201 



The larva is in general of a culicid type, breathing air by a normal 

 air tube and furnished with hair tufts. The peculiarly shaped antennee 

 suggest a predaceous habit. 

 Corethra trivittata Loeio. 



This larva (i'l. XIX, Fig. 2) resembles that of C. plumicornis as 

 fiRured by Westwood (Int. Class. Ins., II, 3^5, 1840, Fig. 124, 12 

 and . , ) It is not of a culicid type, but resembles the Cheironomids. 

 It has no air tube and never comes to the surface, taking air from the 

 water through the body walls. The head has a peculiar projection m 

 front from which depends a double hook (Fig. 2, C), which seems to 

 be the antenna. It is used for seizing prey, as the larva is predaceous. 

 The thorax is swollen, the segments consolidated and contains a pair 

 of curved air bubbles ; a similar smaller pair is situated in the seventh 

 abdominal segment. Abdomen smooth, without hairs, gradually taper- 

 ing behind, almost perfectly transparent. Anal segment with two 

 dorsal hairs and a large ventral brush composed of single barbuled 

 hairs, not tufts ; four anal finger-shaped processes. 



The pupa is shown side and front views (Fig. 2, D and h). it 

 remains upright in the water or resting on the bottom very rarely 

 coming to the surface. Larv^ in dirty marshes. Center Harbor, New 

 Hampshire. EXPLANATION OF PLATES. 



Plate XVL 

 Fi, I LarvaofC«/.x.«W.«./.THEOB., stage IV. ^,oneof the pecten teeth 

 of the af; tube enlarged ; B, the lateral comb of the eighth abdominal segment enlarged. 

 Fig. 2. Larva of Culex atropalpus CoQ., stage IV. 

 Fig. 3. Larva of Culex sylvestris Theob., stage IV. 



Plate XVIL 

 Fig. I. Larva of ^^^/^'.^/"^^"jO.-S., stage IV. 

 Fig. 2. Larva of Culex sollicitans Walk., stage IV. 

 Fig. 3. Larva of Culex pipiens LiNN., stage IV. 



Plate XVIII. 

 Fig. I. Larva of Culex melanurus CoQ., stage IV. 

 Fig. 2. Larva of Culex dyari Coo., stage. IV. 

 Fig. 3. Larva of Culex restuans Theoh., stage IV. 



Plate XIX. 



Yis. I. I^2.xv2i0{ Corethra brakeleyiCoQ. 



Fil 2. Larva of C.;.//^.a.rn.V..^.LoEW. ^, iBature larva, s.dev.ew ;^, the 

 same, back view; C, head of larva, side view, enlarged,; the mouth parts m part 

 opened ; D, pupa, ventral view ; E, the same, side view. 



