104 
The Life History of the Insect. 
In early summer this 
scale, when very abund- 
ant, coats the under 
side of heavily infested 
limbs with a thick 
layer of cotton-like 
waxy masses (Fig. i, 
2), each projecting 
from beneath a brown 
cap or scale — the flat 
body of the mature fe- 
male. This "cotton" is 
secreted and the eggs 
are deposited within it 
in late May or early 
June in the latitude of 
central Illinois, but usu- 
ally one or two weeks later in the Chicago district. 
Something over 3000 eggs are usually laid by each female, the 
number ranging, in our counts, from 2856 to 3863, with an aver- 
a 
Pift. 2. The Cottony Maple Scale, adult females 
on twig-s. Natural size. (Howard, U. S. Department of 
Agriculture.) 
Fig. 3. The Cottony Maple Scale, immature stages: a, newly hatched young, underside; 
/>, <r, younp female, top and side views; d, young- male; e,y^, young on leaf and leaf-stem. Natu- 
ral size shown in «.•. (Howard, U. S. Department of Agriculture.) 
age of 3410. These eggs ordinarily hatch in June in central Illi- 
nois, in early July in the northeastern part of the state, or later if 
the weather of the time is unfavorable. Virtually all are hatched, 
as a rule, by the end of July. The young insects may crawl out on the 
leaves and establish themselves beside the principal veins on both 
