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vhole caterpillar is of a pale brownish tint. Usually, one cater¬ 
pillar, sometimes two or three, eats off the upper cuticle of the 
eaf, curling the two sides upwards till the edges nearly or quite 
neet, and tying them together with web. In this inclosure the 
ittle caterpillar goes through its transformations. It lines the 
)pposite sides of the leaf where the pupa lies with fine white silk. 
Pupa three-tenths of an inch long or a little less; terminating anteriorly in a little 
mob" attached by a neck. There is a series of minute points upon the edge of some of 
;he segments, and the posterior extremity is furnished with two hooks, bent downwards, 
)y means of which the pupa works itself half way out of the closed edges of the leaf 
)efore the moth emerges. 
Moth three-tenths of an inch long, average expanse of wings half an inch. Anten- 
3 ® brown, annulated with whitish on each joint, most distinctly on the under side, first 
oint densely clothed with orange scales. Palpi, orange, horizontal; the scales project 
around and beyond the end of the pentultimate joint, so as to form a little cup in which 
,he small ultimate joint is inserted. Maxillary palpi rudimental. Tegulte well devel- 
>ped, more than half as long as the thorax. Head, thorax and fore wings bright orange. 
The orange scales which cover the wings are observed when carefully examined, or seen 
hrough a lens, to be mixed with numerous whitish, almost silvery scales, so arranged as 
;o form about ten indistinct, transverse sinuous or wavy lines. Hind wings, abdomen 
md legs whitish with silken lustre. There is a little plume of divergent scales at the 
md of the abdomen. 
This little insect furnishes a very remarkable example of the 
sudden appearance and rapid multiplication of noxious species. 
The moth is so rare that I cannot learn that it has ever before 
been seen even by entomologists. There is not a specimen of it 
in the collections of either Mr. Walsh or Mr. Riley; and Mr. 
Glover, of Washington, who is himself an experienced lepidopte- 
rist and is familiar with most of the eastern collections, and to 
whom I had an opportunity of showing my specimens, said he had 
never seen it, and remarked that the species is so peculiar that he 
knew he should recollect it if he had ever met with it.* And yet 
this summer, in a single nursery of young apple trees, specimens 
enough could have been captured to supply all the cabinets in the 
world. 
All I know of this insect I learned during a visit to the fruit 
farm of Mr. D. B. Wier, of Lacon, on the 22d of July. At some 
distance from the place my attention was arrested by the blasted 
*Note. _Since writing the above Mr. Glover informs me by letter that he has recently 
had occasion to visit several of the large collections of insects in Philadelphia and Bos¬ 
ton, and that he could find no specimen of this moth. 
