23 
THE ROSE SCALE. 
(Aulacaspis rosse Sandberg — fig. 12. ) 
This species is similar to the peach scale, and, indeed, the easiest 
way to distinguish between them is by their host plants. The peach 
scale does not affect the host plants of the rose scale, which are roses, 
raspberry, and blackberry. The scale covering is much more thin and 
delicate and the exuvium is usually of a paler or duller yellow than 
in the case of the peach scale. The keel or ridge of the male is more 
distinct. The life history of this species does not appear to be well 
known in this country. It winters, as a rule, in the egg as far north 
as New Jersey; but mature females and immature females and males 
may be. found in winter. In the early spring one 
often finds the female scales surrounded by a radiate 
row of male scales. It is probable that there is more 
than one brood in a year, at least in the South. 
FAMILY APHIDJE (PLANT-LICE). 
The plant-lice are small, sluggish insects found on 
the under surface of leaves or on the bark and roots. 
Most of the individuals have no wings, but at times 
one finds some specimens with delicate transparent 
wings laid roof -like over the body. They all have 
distinct legs, a pair of moderately long antennae, and 
usually quite prominent eyes. They occur in colo- 
nies, and by their numbers often do a considerable 
amount of damage. The eggs are found on trees in 
winter situated near the base of twigs and buds. (See 
fig. 13.) Thejr are minute, oval, or elliptical shining- 
black objects. During the warm part of the year the 
females produce living young, so that one individual 
may, in a few months, be the parent of a large colony. Many of the 
species secrete a sweetish liquid from two pre-apical tubes or cor- 
nicles. This liquid is known as honey-dew, and attracts other insects, 
especially ants. 
TABLE OF PLANT-LICE. 
Fig. 13.— Eggs of a 
plant-louse on twig. 
(Original.) 
Plant-lice on the bark or roots : 
With a whitish, woolly, or cottony covering. 
Without such covering 
Plant-lice on the leaves: 
With bluish-white mealy powder; on plum . 
Dark brown; on cherry 
Green, or faintly reddish; on apple. 
Schizoneura lanigera. 
. . Aphis persicse-niger. 
Hyalopterus pruni. 
Myzus cerasi. 
Aphis mali and A. sorbi. 
