Identification Keys 257 



31. F short, two- or three-haired. Segment eight, K 



three- or four-haired, a longer two-haired tuft 

 between it and H ; I, four-haired, conspicuous; 



M, five-haired Ochlerotatus infirmatus. 



F long, five-haired. Segment eight, K three, 

 haired, no tuft between it and H; I, two-haired; 

 M, two-haired OcJderotatus serratus. 



32. M, on segments seven and eight, one-haired, short; 



D, E, F, and G, three-, three-, three-, and one- 

 haired respectively. Breathing tubes three 

 times as long as wide. H, on segment eight, 

 having one small hair, with a longer double 



hair cephalad Ochlerotatus sylvestris. 



M, on segments seven and eight, two- or more 

 haired, over one-half as long as the following 

 segments 33 



33. H, on segment nine, a tuft of five or more hairs. 34 

 H, on segment nine, a single hair: D, E, F, and 



G, three-, two-, two-, and three-haired respect- 

 ively. Breathing tubes about five times as 

 long as wide Culicella dyari. 



34. D and E each two-haired. M, on segments five 



to seven, four-haired. H, on segment eight, 

 four-haired, with a longer, two-haired tuft 

 cephalad. Breathing tubes four times as long 



as wide OcJderotatus abfitchii. 



D and E each with three or more hairs. Follow- 

 ing combination of characters not as above . 35 



35. K and M, on segment eight, each two-haired. 



Hair dorsad of H, on segment nine, double. H 

 and the tuft cephalad of it on segment eight, 



not much different in size 36 



K, on segment eight, four-haired, shorter than 

 in preceding group. Hair dorsad of H, on 

 segment nine, single. H on segment eight 

 much shorter than the tuft cephalad. D, E, F, 



