J907.} 



The Cottony Maple Scale in Illinois. 

 The Life History oe the Insect. 



347 



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- 



PiG. 2. Tte Cottony Maple Scale, adult females 

 on twijTS. Natural size. (Howard, U. S. Department of 

 Agriculture.) 



Fig. 3. The Cottony Maple Scale, immature stages: a, newly hatclied young, underside; 

 A, c, young fenlale, top and side views; d, young male; tf,^^ young on leaf and leaf-stem. Natu- 

 ral size shown in e. (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 hatchied, 

 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 



