SHADE TREES 



109 



migrates. The larvae pupate within the cases, and 

 about three weeks later change to moths. The two 

 sexes of the moths differ greatly, the male (d) having 

 well-developed wings, while the female (c) is wingless. 

 The latter deposits her eggs in the empty pupa-case 

 from w^hich she has emerged, falls to the ground, 

 and dies. 



Remedies — Spray with an arsenical poison early 

 in summer when the worms are young. Pick off the 

 cases in winter. 



White=marked Tussock=inoth 



a, female moth on cocoon; 6, young larva hanging by thread; c, female pupa; 

 d, male pupa : male moth. (After Riley) 



The larvae of the White-marked Tussock-moth 

 is one of the most beautiful of our caterpillars. If the 

 trunks or larger limbs of maple, apple, elm, or any 

 other of the trees infested by this insect, be examined 

 in autumn or winter, one may find, scattered here and 

 there upon the bark, thin gray cocoons, many of them 

 being covered with large bunches of spherical white 

 eggs fastened together by a protecting froth-like mass. 

 In May, soon after the leaves come out, these eggs 

 hatch into small caterpillars, which feed upon the 

 foliage, becoming full-grown in six or seven weeks. 

 Their general color is bright yellow, with head and 

 tubercles on rear of back red, and four cream-colored 



