MEMOIRS OF THE NATIONAL ACADEMY OF SCIENCES. 103 



AiilKnh, i„Hn,nl,, Grote, Ptoc. Eiit. Soc. Phil., Ill, p. 93. June, lSt>4. 



Aii',s,.tn /.,/h,,;.l,, PACK.MiD, Proo. Knt. Soc Phil., Ill, p. 385. Xov., 1864. 



Aiiisut.i rir<ju,i,-i,sts P.\cK,\iiii, I'lVH'. Knt. Soc. Phil., Ill, p. 385. Nov., 18(W.— Fifth Rep. U. S. Ent. Couuii.. 



p. 127. 1890. 

 Adelocephala pellucida Boisdi'v.\l, Annales .Soc. Ent. Belgique, X\', p. 87. 1872. 

 Anisota virginimm Kirbv, .Syn. Cat. Lep. Het., I, p. 739. 1892. — Nei'.mogex ami Dy.\k, .Tourn. New York Ent. 



Soc, II, p. 148. Dec, 1895. — Beuten.muller, Cat. bombycine moths New York, p. 440. 1898. 



Lanxi. 

 (VU. IV, V, ligs. 1-5; XXIX, L, tigs. 1-1<1, LII, tigs. 1-lc) 



Smiih-Ahhot, Nat. Hist. Lep. Ins. Georgia, p. 115, Tab. 58. 1797. 



Harris, T. II'., Treatise Ins. inj. veg. 3d edit., p. 407. 



Riley, C. T'., in Packard's Insects Inj. Forest Trees, p. 127. 1890. 



French, G. H., Rep. Curator Mus. S. 111. Normal Univ. 1880. 



Packard, A. S., Fifth Rep. U. S. Ent. Comm. Insects Inj. Forest Trees, j). 127. 1890. 



Lugger, 0., Bull. 10. Agr. Expt. Station .Minnesota, PI. I, tig. 3. 1.890. 



Beutenmuller, 11'., Cat. bombycine moths New Y'ork, p. 441. 1.S98. 



Imago. — 5 c? , 5 ? (and many others observed). 



Male. Antenna- bipeetinated a little beyond the middle, beyond filiform; as usual in 9 

 simple. Fore winos reoularly triangular and smaller proportionally than in any of the other 

 species; costa straight, curved toward the subacute apex, outer edge very oblique, not full and 

 convex as in S A. se/idtcrin, hut straight and nearly one-third longer than the inner edge; the 

 inner angle less rounded tlian in S A. .senator/a; middle of the wing transparent from the discal 

 spot outward to the hinder part of the outer edge and eti'acing the extradiscal line, except toward 

 the apex. Discal spot nearly twice as large as in ^4. neiiatorla and Ktigma, being round or subovate. 



Hind wings regularly triangular, costa very full; inner angle produced almost into a sort of 

 lobe and reaching to the outer third of the abdomen; the outer edge very oblicjue. either a little 

 convex or even slightly concave; immaculate, not usually, if at all, speckled, and with no extra- 

 discal line. 



Under side of wings: An extradiscal line common to iioth wings, though on the anterior 

 pair effaced over the hyaline area; on the hind wings broad and diffuse, sometimes wanting. 

 Discal spot fainth' reproduced, the color paler than above. 



Female. Wings not .so broad as in ^1. s,'it(if<>r!ii. but of the same general shape as in A.sena- 

 toria, etc. In color, while the squamation is thin, as in ^1. seiiatoria, the wings both at the base 

 and on the outer margin are more lilac or i)urple and less ocherous, while the wings ai-e less 

 .speckled than in A. -sfigind and sc/i'i/a/'/'a, the outer edge not being spotted. Extradi.scal line dif- 

 fuse, not very distinct or dark. Di.scal spot slighth' larger than in ^1. stigma and senatoria, 

 under side pale ocherous; outer edge of both wings deeper lilac than in ^1. stigma and A. senafaria. 

 Hind wings more convex toward the ))a.se of the costa than in any of the other species. Beneath 

 not spotted. The abdomen is much i)aler than in S . 



Expan.se of fore wings S 40— 1:2 mm.; ? 50 mm. Length of a fore wing $ 18-20 mm.; 9 

 26 mm. Breadth of a fore wing S 8-!> mm.; 9 13 mm. L(>ngth of hind wing $ 11-12 mm.; 9 

 17 mm. Breadth of hind wing $ 7-8 nun. ; 9 11-12 mm. 



This species differs markedly from any of the others in the cliaiacteristics of the male, whose 

 narrow fore wings are regularly triangular, while those of the hinder pair are triangular, nuich 

 roiuided on the costa. with the inner angle produced, almost into a lobe. The S is thus the most 

 divergent of any species of the genus, but in the shape of the wings only. Another characteristic 

 is the thinness and transparency of the fore wings beyond the discal spot, which is larger than in 

 any of the other species. The less divergent female differs from those of ^-1. stigma and .1. seit- 

 atoria in the stronger lilac hues and in the al)sence of the dusky strigie. 



"Moth. — Besides being smaller, the male differs from those of .1. iiligma and senatoria in the hind wings being 

 distinctly triangular, the outer edge being straight, and the liind angle somewhat produced; the fore wings are also 

 decidedly narrower, while the white discal spot is considerably larger, and the wings are throughout consideralily 

 darker and free from dark si)ots. Expanse of wings of male, 40 mm." (Riley i. 



