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1.         Siphon absent; abdominal segments III-VIII with palmate hairs. . .. . . . Anopheles

            Siphon present abdominal segments without palmate hairs. . . . . . . . . . . . . . . . . 2

2.         Siphon with a pecten. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

            Siphon without a pecten. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

3.         Siphon with a basal pair of hair tufts. . . . . . . . . . . . . . . . . . . . . . . . . . . . Culiseta

            Siphon without a basal pair of hair tufts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

4.         Siphon with several pairs of hair tufts (but not basal). . . . . . . . . . . . . . . . . . Culex

            Siphon with only one pair of hair tufts (but not basal). . . . . . . . . . . . . . . . . . . . . 5

5.         Head longer than wide; abdominal segment VIII with a sclerotized plate bearing
            a row of teeth. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Uranotaenia sapphirina

           Head wider than long; abdominal segment VIII without a sclerotized plate. . . . . . . 6

6.         Saddle pierced by anterior tufts of ventral brush. . . . . . . . . . . . . . . . . Psorophora

            Saddle not pierced by anterior tufts of ventral brush. . . . . . . . . . . . . . . . . . Aedes

7.         Siphon with apical half pointed and with a serrated edge. . Coquillettidia perterbans

            Siphon not pointed and without a serrated edge. . . . . . . . . . . . . . . . . . . . . . . . . 8

8.         Siphon with many single or multiple hairs; abdominal segment X without a ventral
            brush. . . . . . . . . . . . . .  . . . . . . . . . . . . . . . . . . . . . . . . . . . . Wyeomyia smithii 

            Siphon with one pair of ventral hair tufts; abdominal segment X with a ventral
            brush. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

9.         Abdominal segment VIII with comb scales. . . . . . . . . . . . . . . . . . Orthopodomyia

            Abdominal segment VIII without comb scales. . . . . . . . . . . . . . . . . . . . . . . . . .
            . . . . . . . . . . . . . . . . . . . . . . . . , , , , , . . Toxorhynchites rutilus septentrionalis

 

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