124 



FOURTH ANNUAL REPORT OF 



prolongation of the hind wings (See Fig. 47) of iw/Kf, are the first to attract 

 the eye. The green varies in tint, having either .a cold, bhiish, almost 

 pearly look, or being strongly suflt'used with yellow. The body is some- 

 times pure white but more generallv yellowish or cream-colored, and though 

 [t's 4^] ' ' the hind JIl--^^-^ 



borders o f 

 the wangs 

 are usually 

 yellowish, 

 they are 

 sometimes 



stained with the same deep color as 

 the anterior or costal border. 



The cocoon of this insect (Fig. 49) 

 is formed within a leaf, or leaves 

 drawn together, and in the fall of 

 the year drops to the ground where 

 it remains all through the winter. 

 It is whitish or brownish*, closely spun, tough, oval and closed at each 

 end- but it is so thin and contains so little silk, that it cannot be unwound 

 and possesses no value compared with some of the others. 



The eo-«i-s are deposited in small batches on the twigs : the}' ai*e slightly 

 lar"-er than those o£ cynthia, and more or less deejily colored with a brown 

 adhesive tluid. 



The worm feeds with us principalh' on AValnut and Hickory; but is 

 also found on Sweet gum. Beech, Birch, and even Willow and Plum. 



Larval Ciiaxges.— In the lirst stage the worm is of a pale green eolor, with two brown trans- 

 verse bands across the head something as in Figure 4:5, b, and a brown longitudinal mark along each 

 side of the body, especially distinct on the four anterior joints and sometimes meeting on the back of 

 the 4th. It is covered with setaceous tubercles, jilaced in jn-ecisely the same position, and of the 

 same size as those of Cecropia, Promelhea and the others at the same age, the stiff hairs ))eiiigmostly 

 tinged with brown, ni tlie second stage tlie brown ni irks on the head mostly remain, but often are' 

 less distinct; the lateral brown stripes vanish anil the four dorsal tubercles on joint 1, the two upper- 

 most tubercles on joints 2 and 3 and the mid(Ue one on joint 11 are generally orange-red. In the third 

 stao-e there is very little change; the upper band on the head usually disappears entirely, the tuber- 

 cles become uniform m color again, and some of the bristles become more conspicuously black 

 and more spinous. In the fourth stage, the tubercles are reduced in relative size, especially the sub- 

 dorsal row. In the tifth stage these tubercles become relatively still rmaller, and some few other 

 changes take place. The full grown larva (Fig. 48) alftiost equals the parent moth iu delicacy of 

 color being of a remarkably clear pale green inclining to yellowish above and bluish below. The 

 siiles slope, roof-fashion, from the si);racles to the back, which is comparatively narrow, and where 

 the sutures are very deep, causing each joint to form a sort of tubercle having a crescent shaped in- 

 denture, and reminding one of those on the back of some of our wood-borers such as the Round- 

 headed Apple-tree Borer. There is a longitudinal substigmatal yellow line each side, and a trans- 

 verse yellow line on the posterior edge of the 4th to the lOth joints inclusive. The tubercles are ver- 

 million-red, the lower ones darkest, the upper ones verging on to orange; and on joints -2 — 5 there is an 

 additional ventral tubercle each side. The spiracles are <leep reddish-brown: the head is bluish- 

 green shaded above with light brown, and at sides with darker brownf: the upper lij) is produced 

 into two api)en(Ucles more prominent than in any of the species yet described and serving no doubt 

 to steady the leaf which the worm is gnawing. The cervical shield is horny, with a tinge of blue. The 

 thoracic legs are brown with yellow at base, and the prolegs light brown with a black outer line just 

 above the coronet of hooks. The caudal plate is narrow, bluish, with brown edges and bordered 



* Doubtless according to food-plant. Specim.'us fed on Hickory have given me the darker cocoons 

 •f Exceptional specimens occur with the head and thoracic legs almost black. 



