34 MAINE AGRICULTURAL EXPERIMENT STATION. 



head beyond which extend two stiff pencils of black hairs 

 directed forward like horns. A single pencil of similar con- 

 struction supplies the other end of the body with a tail. Upon 

 the middle of the back, starting a little behind the head, is a 



Fig. 15. (After Riley). 



row of four regular tufts of soft whitish hairs which resemble 

 small paint brushes neatly trimmed off at the tip. In a line 

 with these but nearer the tail occur two little bright red tuber- 

 cles (fig. 15). The full grown antique tussock caterpillar 

 resembles closely the species just described. Its head, however, 

 is jet black and it has an additional pair of black pencils, simi- 

 lar to though shorter than the horns, projecting from the sides 

 of the body, which is lacking in the caterpillar of the white- 

 marked tussock. 



After feeding for four or five weeks the caterpillar becomes 

 full grown and spins a rough cocoon of silk with which it mixes 

 the hairs that have decorated its body. These cocoons are usu- 

 ally formed upon the bark or in the angles of twigs. Often a 

 leaf is attached to the mass. 



-In about two weeks the adult insects emerge from the cocoons. 

 The males are winged, the white-marked tussock having gray 

 wings which expand nearly one and one-half inches and the 

 antique tussock having smaller brown wings. The female 

 moths of these two species are not readily distinguishable. They 

 never acquire wings and their distended bodies are practically 

 little more than animated sacs of eggs. The females being 

 unable to fly and their bodies being too heavy for their slender 

 legs to drag about, cling to the cocoons from which they emerge 

 and soon after mating deposit about 300 eggs in a mass upon 

 the cocoon. 



REMEDIAL MEASURES. 



The white egg masses deposited on the cocoons remain on 

 the trees all winter. These are readily seen and can be removed 



