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344 COLLEGE ENTOMOLOGY
8. Cleared, stained, and unstained specimens may then be further cleared
for 5 to 10 minutes in a mixture of acetic acid 1 part to xylol 2 parts, or
in xylol, clove oil, or cedar oil. Specimens left in straight xylol or oils
may become very brittle. Xylol may also reduce the brilliance of the red
stains.
9. Transfer to and mount directly in canada balsam. The acetic acid should
be removed in alcohol before clearing if euparal or certain other mount.
ing media are used.
The classification of the coccids is undergoing constant revision. Where
only one family was known a few years ago, no less than 13 families are recog·
nized at present by some workers. I am following Ferris in the arrangement of
genera in the different families. Nine important families are included in the
following brief discussion.
Family MARGARODIDlE (Newstead 1901), Morrison 1927 (Mar'ga-ro'di-dce,
from the Greek /- eiongata Green: B. Diaspis amygdali Tryon;
C. CeToputo ambigua Fullaway; D, Lecanium marsupiale Green; and dorsal and ventral aspects
of the head. (A,B,D, after Green; C, after Fullaway.)
with distinctly segmented bodies often hidden beneath or in waxy secretions.
EYes are absent or represented by a pair of ocellanre. The legs are well de-