112 MEMOIRS OF THE NATIONAL ACADEMY OF SCIENCES. 



Larva. 

 (PI. VII; XXIII, tig. 2; XXXII, figs. 2, 3; LII, figs. 4, 4«-4'/.- LIII, figs. 2, 2a-2c.) 



B. D. ^VaMl (description by Lintnei'), Proc. Ent. Soc. Phil., Ill, p. 426. 1864. 

 II'. Saunders, Can. Ent, II, p. 75. 1870. 



T. Glorer, Rep. U. S. Dept. Agr., p. 83, fig. 1870. 



J. A. Lintner, 26th Rep. N. Y. State Cab. Nat. Hist., 'p. 133. 1872. 



C. V. Riley, 5th Rep. Ins. Missouri, p. 137. 1873. Fig. of larva, pupa, and niotli 9 • 

 C. H. French, Trans. Dept. Agr. Illinois, XV, p. 196. 1877. 



A. R. Grotc, Can. Ent., XIX, p. 52. 1887. 



ifw. Ballard, Insect Lives, p. S3. 1879. 



/. Marten, Trans. Dept. Agr. Illinois, XVIII, Appendix, p. 121. 1880. 



A. S. Packard, 5th Rep. U. S. Ent. Comm. Insects Inj. Forest and Shade Trees, p. 393, fig. ex Riley. 1890. 



.1. ,S'. Packard, Proc. Amer. Phil. Soc, :\Iar. 17, 1893, XXXI, No. 141, p. 142-144, PI. V, fig. 1. Larva, stage II. 



H'. Beulenimdlcr, Cat. bonibycine moths N. York, p. 440. 1898. 



Imago. — 5 ,? , 5 ? . Head and Ijody iiiiiforiuly pale oeheiou.s, varyini;- in depth of hue. The 

 front of the head below the vertex and the spi'eading tuft of hair-like .scales at the ba.se of each 

 antenna ro.se pink. 



Fore wings deep roseate on the ba.sal half, the hue varying from light to dark; the outer edge 

 of the wing also ro.seate from about the middle of the inner edge to the costa just before the apex, 

 the middle of the wing being yellow; and this subtriangular median band varies in width, some- 

 times l)eing wide on the inner edge or not reaching clear across the wing to the inner edge; the 

 band also varies in regularity on the inner side; no discal .spot; fringe pale ocherous. 



Hind wings 3'ellow ocherous, with a submarginal pink band, narrow in the middle of the wing 

 and widening on the inner edge. Underside of the fore wings much as above, but less roseate 

 at the base of the wings. Hind wings with the entire costal edge pink, otherwise as above. 

 Abdomen on the underside along the middle pink, but ocherous at the end. Legs all pink. 



Expan.se of fore wings, S 4U mm. ; 9 48 mm. Length of fore wing, <J 2U nuu. ; 9 li-i mm. 

 Breadth of fore wing, J" 10 mm. ; 9 12uini. Length of hind wing, <? 13 mm.; 9 10 mm. Width 

 of hind wing, S 10 mm. : 9 12 mm. 



Vxrialion-s. — One <^ from Franconia, N. H., received from Mrs. Slosson, is paler, less 

 ocherous, almost cream white, more bleached in appearance and with less roseate, and the pink 

 paler than in the normal form. Fore wings with an extradiscal narrow pink line, but be3"ond this 

 the edge of the wing is pale like the middle of the wing. Hind wing with no pink band above 

 or beneath, though the costal edge is pink. It is of the usual size, though slightly larger than 

 one of my males of the normal form. This mountain form is apparently intermediate V)etween 

 Grote's race aiha and the normal mthicunda. 



Egg. — Length, 1.4 mm; oval, a little flattened; the shell j-ellow, thin, parchment-like, the 

 surface smooth, polished, under a one-half inch objective showing no traces of pits or polygonal 

 areas. The shell is so thin that unfertilized eggs collapse irregularly. 



According to Riley the eggs are deposited in patches of thirty and upward on the luider side 

 of a leaf. Thej' are pale greenish in hue. 



Larv<t — Stage I. — Length, 5 mm.; at end of the stage, 7 nuu. The head is deep black, large, 

 rounded, and directly after hatching, before the larva has begun to eat, much wider than the 

 body. Prothoracic segment at first nuich wider than the rest of the body and without any dark 

 pigment on the cervical shield. The tjodj' is nOw pale yellowish, with a slight greenish tinge. 

 Except a slight dusky medio-dorsal line the body is not yet striped, and there is no trace of 

 reddish pigment on the under side. 



" The two horns on the second thoracic segment are al)out as long us the segment bearing 

 them is thick; they are entirely smooth, with no ti'ace of spiiuilcs; thev have numerous tine 

 wrinkles; greenish-yellow at base, beyond, black; thej' are .slightly enlarged at the end, which is 

 slightly divided, each fork giving rise to a seta nearly as long as the entire spine. (PI. LII, tig. 4.) 



The spines on the rest of the body (there being none on the prothoracic segment) are minute, 

 smaller than in the other species, and much smaller than in the next stage, but with a propor- 



