AND THE MECHANIC ARTS. 



515 



cerning this habit but little or nothing is known. Eggs have 

 been found at Brunswick, Me., July 3 (Packard), hatching 

 about a week later. 



It is from the first larval stage that this species takes its 

 name. The larva, as described by Packard, is about 5 mm. long, 

 of a uniform dark chestnut or reddish brown, the body taper- 

 ing from the head backward, and "possessing at this stage an 

 extraordinary armature of nine pairs of enormous horns like 

 those on a deer. The prothoracic pair are nearly three times 

 as large as those on the first abdorminal segment." Following 

 this stage a radical change occurs before the larva reaches it? 

 full development, the horns or tubercles being lost, and the 

 color changing from brown to green. 



The full-grown caterpillar varies greatly in its general appear- 

 ance. It is a green caterpillar, about 40 mm. (1 3-5 in:) long, 

 with a purplisb-brown, saddle-shaped marking near the middle 

 of the back. In the last stage before pupation all the purplish- 

 brown may be lost, the worm having a uniform green color. 

 Some, however, seem to retain the brown, while others are 

 green almost their entire life. 



After feeding for about four weeks the larvae drop to the 

 ground and crawl under the leaves, where the change to the 

 pupal stage occurs. The pupa is about 18 mm. in length, of a 

 dark reddish brown, and extremely difficult to distinguish from 

 the pupae of many other members of this group. It is in this 

 stage that the winter is passed, the adult moths issuing the next 

 June. 



Technical Description of Adult. General color pale ash gray, 

 a silvery cast in certain lights, an olive green reflection in oth- 

 ers. Fore wings mottled with dark and light patches, the veins 

 being nearly black. Head and base of antennae yellowish, palpi 

 ash-colored. Byes brownish black. Thorax ashen, much dark- 

 er along posterior edge, and near base of wings. Tips of fore- 

 wings lighter than base, of a greenish cast, and edged with a 

 fine fringe, at the base of which is a black line connecting the 

 veins. A double row of very faint scalloped markings cross the 

 wing about Lwo-thirds the distance from the base. Midway be- 

 tween the base and tip of the wing is a crescent-shaped mark 

 of ash-bronze. 



Hind wings ash gray, light at base, dark toward tip, and along 

 costal border. Base of wings covered with long, fine hair. Dis- 

 tal margin fringed and marked with black as in fore wing. 

 Trace of a whitish line across wings, more distinct near costal 



