446 NEW YORK STATE MUSEUM 



d Antennal tuft before the middle 



White dotted mosquito, Culex restuans 

 dd Antennal tuft at outer third 



e Antennae not white banded, air tube somewhat fusiform; ter- 

 minal spines of comb scales fine 



House mosquito, Culex pipiens 



ee Antennae usually conspicuously white banded, air tube tapering 



/ Air tube not over four times as long as wide, terminal spines of 



comb scales coarse Culex tarsalis 



// Air tube over four times as long as wide, terminal spines of 



comb scales fine Culex secutor 



cc Pecten teeth pale, divided into two nearly equal processes 



Deinocerites cancer 

 ccc Pecten teeth almost black, about 20 in number, with small basal den- 

 titions ; comb scales about 2 5 

 d Pecten rows continuous, the large apical spine of the comb scales 

 being from one third to one half the length of the entire structure 



Culicada fitchii 

 dd Pecten with several isolated apical teeth 



e Lateral hairs of first abdominal segment double, detached teeth of 



pecten well spaced Culicada abfitchii 



ee Lateral hairs of first adbominal segment single, apical pecten 



teeth only a little detached Culicada vittata 



aa Air tube moderate in length, from about two to four times longer than its 

 greatest diameter 

 b Air tube decidedly fusiform 



c Antennae long, anal segment long; comb consisting of six or seven 



subequal spines Janthinosoma musica 



cc Antennae moderate, apical portion black; anal segment short, wider 

 than long, with four pecten teeth on the basal half of the air tube 



Grabhamia jamaicensis 

 bb Air tube greatly enlarged at the base, linear apically and crowned 

 with a circle of recurved spines 



Taeniorhynchus perturbans (young) 

 bbb Air tube tapering uniformly and bearing irregularly placed, large 

 setae along its entire length; comb scales 10 in a single row 



W y e o m y i a smithii 

 bbbb Air tube without pecten; no comb scales 



c Conspicuous air reservoirs in the thoracic and seventh abdominal 



segments ; larv^ae aquatic Corethra 



cc No conspicuous air reservoirs; air tube bearing several long apical 



setae Corethrella brakeleyi 



bbbbb Air tube with pecten, more or less tapering; comb scales present 

 c Seventh abdominal segment with a large dorsal plate, comb consist- 

 ing of a double row of slender spined scales attached to the posterior 

 edge of a chitinous plate; air tube without pecten 



Pneumaculex signifer 

 cc Seventh abdominal segment without dorsal plate 

 d Comb scales not more than 10 



e Comb scales quadrate, with a very long median spine and shorter 

 lateral ones 



