270 



INSECTS AFFECTING SHADE TREES 



The wingless female moth is somewhat spider-like in appearance 

 and of a grayish color, while the male is dull gray, with several 



Flo. 272. Tree in foreground killed by elm tree borer. 



1\ A * I i | 



FIG. 273. White-marked tussock cater- 

 pillar. (After Riley.) 



FIG. 274. White-marked tussock 

 moth, male. (U. S. Bu. Ent.) 



dark gray lines crossing the fore-wings. It is about one inch in 

 length (Fig. 274). 



Life History. When full grown the caterpillar spins a yellow- 



