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Papliia glycerium^ for instance, a totally different mechanical 

 provision for clutching the membrane, namely, a notch between 

 the ridges around the rectum and the base of the cremaster 

 proper, in which the skin may be caught, the ridges being, in 

 this species, veiy narrow, smooth, and shallow, and the ordinary 

 ventral knobs obsolete. 



Is this Euchaetes collaris (Fitch.) ? 



The earliest mention of an Euchaetes larva distinct from that 

 of E. egle (Drury), is in Mr. J. A. Lintner's Entomological Con- 

 tributions, iii, p. 147, whei-e it is stated that Prof. C. V. Riley 

 had recently bred the larva of E. collaris, and found it very dis- 

 tinct from that of E. egle. But Prof. Riley has omitted to pub- 

 lish the differences, and the first account of the larva is given by 

 Mr. G. H. Van Wagenen, in the Canadian Entomologist, Sept. 

 1877, V. 9, p. 170. As Mr. Lintner's description of the larva 

 and pupa (given in Mr. Van Wagenen's article) differs, in 

 many respects, from one I had previously drawn up from a 

 living specimen, I am led to present this description in full. My 

 observations agree with Mr. Van Wagenen's as to the solitary 

 habits of the larva, but differ as to the food plant ; yet his 

 observations may prove that Apocynum is the proper food of 

 the insect. As the existing descriptions of the moth appear to ■ 

 be at variance with one another, a description of the moth 

 reared from the larva is added. 



Mature larva. Testaceous, clothed with tufts of tawny 

 plumose bristles ; head a little paler. The eight ventral pro- 

 legs with a black spot at their external base. Each of the first 

 three segments of the body with two black tubercles on each 

 side bearing a few bristles ; first segment with a dorsal fringe of 

 bristles inclining forwards, second segment with two pairs of 

 approximated dorsal tubercles which bear slender tufts of bristles 

 extending 3 mm, beyond the head when the larva is at rest, 

 third segment with two pairs of approximated dorsal tubercles 

 which bear dense tufts of bristles, the bristles curving forwards 

 slightly, and one third longer than those on the abdominal 



