PLATE 38.— SCALE INSECTS. 



The Woolly Maple Scale in cocoon condition, collected in masses in crevices of bark of Sugar 

 Maple (about natural size). 2. Adult females of woolly maple scale surrounded by cottony 

 tufts containing eggs. The larvEe are seen along the veins (about ^2 natural size). 3. The 

 Cottony Maple Scale, adult females on twig of white maple. The cottony masses excreted by 

 them contain the eggs, 4. Twig infested by San Jos<' scale. 5. Twig infested by male scales 

 of Scurfy Scale. 6. Twig infested by Oyster Shell Scale (3, 4, 5, and 6, about natural size). 



