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IX] parts and organs, and will help the student to understand descriptions of genera and species.

Fig. 30.—Heads of Culicini.

a, Male; b, female.

The antennæ of the male insect (Figs. 30, a, and 31, c) are usually adorned with a profusion of long, silky hairs, in marked contrast to the scanty, down,

Fig. 31.—Heads of Anophelini. c. Male; d, female.