ATTACKING THE LEAVES. 



167 



with black points; fore wings gray, with black or brownish- 

 black markings; hind wings brownish gray. When ex- 

 panded, the wings measure 

 about an inch and a half "^°' ^^^• 



across. 



This species is double- 

 brooded. The moths that 

 appear in July deposit eggs 

 from which hatch larvae which 

 reach maturity in September, 

 enter the chrysalis state, and remain in this condition until 

 the following spring. An Ichneumon fly attacks this species 

 and destroys many of them. They are seldom numerous, 

 and never likely to prove very troublesome. 



No. 86. — The Horned Span-worm. 



Nematocampa filamentaria Guen. 



This singular-looking caterpillar is frequently found on 

 plum-trees, devouring the leaves; it is also found on maple, 

 oak, and probably other trees, and on strawberry-vines. It 

 is about seven-tenths of an inch long (see Fig. 176), of a 

 grayish color, with dusky and blackish 

 streaks. On the hinder part of the fifth Fia. 176. 

 segment are two long, curved, fleshy horns 

 extending forward, and on the sixth segment 

 there is a similar pair curving backwards. 

 The head is spotted with brown. There are 

 two short brown tubercles on the posterior 

 part of the fourth segment, and two small 

 gray warts on each of the segments behind, those on the 

 eleventh being most prominent. It may be found during the 

 first half of June, and sometimes later. During the latter 

 part of the month it constructs a slight cocoon composed 

 of pieces of leaves fastened together with silken threads, and 

 within this enclosure changes to a reddish-gray or pale-brown 



