Dec, 1906] DyarandKnab: Larvae of Culicid^e. 205 



lumbia. It undoubtedly has a northern range, like all the early 

 Spring forms that hibernate in the egg state. 



Genus CULEX Linnaeus. 



Culex Linnaeus, Syst. nat., ed. x, 602, 1758. 

 Melanoconion Theobald, Mon. Culie., iii, 238, 1903. 

 Melanoconium Blanchard, Les Moustiques, 395, 1905. 

 Neoculex Dyar, Proc. ent. soc. Wash., vii, 48, 1905. 

 Micraedes Coquillett; Proe. ent. soe. Wash., vii, 185, 1906 

 Tinolestes Coquiilett, Proc. ent. soe. Wash., vii, 185, 1906. 



The larvae typically have the antennae with a large tuft at about the 

 outer third, beyond the middle, the part before the tuft thick, that 

 beyond it slender ; air tube long, over four times as long as wide with 

 several tufts along the posterior edge; anal segment uniformly 

 ringed by a chitinous band, the ventral brush confined to the barred 

 area. Certain species diverge from this type in the degeneration of 

 the antennae, which come to resemble those of A'edes. Others diverge 

 in the shortening of the air tube. In two species both these diverg- 

 ences coexist and, although they still retain the multiple tufts of the 

 air tube, we have been obliged to include their names in both the 

 tables of the species of A'edes and Culex to avoid confusion. It hap- 

 pens that some A'edes have the anal segment ringed, and one (trich- 

 urus Dyar) has multiple tufts on the tube, which renders the abso- 

 lute definition of these genera difficult when the aberrant forms are 

 included. 



Table of species. 



1. Antennae with the tuft at the middle of the uniformly shaped joint 2 



Antenna; with the tuft outwardly placed, the part beyond slender 5 



2. Air tube very long (8 x 1), pecten teeth long spines; abdominal hairs in 



coarse stellate tufts bisulcatus 



Air tube shorter, about four times as long as wide 3 



Air tube only about two-and-a-half times as long as wide 4 



3. Antennae with a tuft; anal segment smooth restuans 



Antennae with a single hair; anal segment spined pleuristriatus 



4. Ring of anal segment narrow; pecten not to half of the tube; two tufts 



within pecten, two beyond in line janitor 



Ring of anal segment broad; pecten over half of tube; two tufts within, 

 two beyond not in line, two on dorsal aspect lactator 



5. Air tube three times as long as wide or less 6 



Air tube four times as long as wide or over 7 



6. Body pilose; pecten of the air tube to three-fourths interrogator 



Body spicular-granular; pecten of the air tube small, to one-third barbarus 



