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OR INSI-XT OF ITCH AND MANOE. 
Figure 1.—The male insect. 
a. The head— bhbh. the four fore feet— cccc. the suckers— d. the body—^ 
ee. the outer hind feet—^/y*. the inner hind feet— g. the hind parts. 
Figure 2.—The female insect. 
n. The head— bbbb. the four fore feet— cc. the suckers— d. the body— 
ee. the outer hind feet—y* f. the inner hind feet. 
These acari are larger than those found on the human being, 
and can easily be seen with the naked eye. They consist of 
males and females, that can without difficulty be distinguished 
from one another by the size and form of their bodies. The body 
of the male insect, when it has reached its full growth, is one- 
fifteenth of a line in length, and about the same in breadth ; 
and when viewed from above or from below, has some resem¬ 
blance to a square with the four corners cut off. 
The thickness of the body amounts to about half its breadth. 
The back and the belly are moderately rounded. The whole 
body is covered with an elastic parchrnent-like skin, which, 
when viewed under a microscope, appears to be marked by a 
multitude of small furrows and raised lines. On the back these 
furrows mostly run across, and on the sides they principally run 
longways. They form together an irregular surface resembling 
that of morocco leather. 
On the back is also seen an uneven hump, and on each side 
of it is a dark half-moon-shaped line—prol)ably either a hollow, 
or a transparent part of the skin through which the bowels 
VO F.. X I. 3 I) 
