224 SCALE-INSECTS, BARK-LICE, MEALY-BUGS. 
D. Exuviz small. ; 
E. Scale of male, white and car- 
inated; last segment of fe- 
male with five groups of spin- 
EGR CUS hice = vaniings tc ics att a teneneret CHIONASPIS. 
EE. Scale of male white, but not 
carinated; female with eight 
groups of spinnerets......... POLIASPIS.. 
EEE. Scale of male similar in form to 
that.orthe wemale...: +56 5 oe MYTILASPIS. 
DD. Exuvie large. 
F. Two moulted skins visible on 
the scale of the female. ...PARLATORIA. 
FF. Second skin covered by a se- 
CTEMON eee. he UHLERIA.. 
Only a few of the more important species can be given. 
The genus Aspidiotus is a very large one, and contains 
some very injurious scale-insects. 
Aspidiotus ner Bouche. (The Common White-scale). 
This scale is very abundant in the southern states, where it 
occurs on a great variety of plants. But it is by no means a 
stranger in our own state, where, much to the sorrow of lovers. 
of flowers, it is sometimes found in destructive numbers on many 
house plants. 
Aspidiotus ancylus Putn. (The Eccentric Scale of the Elm). 
A careful examination of our silver maples and elms some- 
times reveals the presence of a small gray scale, which so closely 
resembles the color and texture of the bark to which it is fastened, 
that it would be still more difficult to see it if it were not raised 
above the smooth surface of its resting place, Fig. 181. The 
largest scales are about one-sixteenth of an inch in diameter, 
and somewhat circular or oval, although sometimes quite irreg- 
ular in outline. The scales of this species are usually found 
close together in groups of all sizes, from three or four to one 
hundred or more. It frequently happens that the scales overlap 
each other, and some of them are thus pushed on the backs of 
their fellows, so that they do not touch the bark at all. The 
