96 MEMOIRS OF THE NATIONAL ACADEMY OF SCIENCES. 



Pupa. — ^Iiu-li like tliut of Anisota and Adelocophula; the caudal spine being long and 

 slender and sliglitl_v forked at the end. 



Food plant. — It feeds on a high forest Mimosa. 

 Geographical range. — Nova Fribiii-go, near Rio de Janeiro. 



ANISOTA. HiHiner. 



(Plates XX.) 



Anisota Huebner, Verzeichniss Schmett. p. 192. 1818-1822." 



Drijocampa Harris, Cat. Ins. Mass. in Hitchcock's Report on tlie Geology of Mass. 4°, WM. and 2(1 edit., 



p. 72 (p. 592), 1835; Treatise Inj. Insects, \>. 293, 1841. .3d edit. 1862.— W.^lkeh, Cat. Lep. Het. Br. 



Mas. VI, p. 1495, 1855. 

 Anis^iitii Grote, Proc. Ent. Soc. Phil., Ill, p. 93. June, 1864. 

 Dri/iirciiiijiii and Aniaota P.\ck.\rd, Proc. Ent. Soc. Phil., Ill, p. 384. Nov., 1864. 

 Adelocephula Boisduv.^l (in part), Annales Soc. Ent. Belgique, XV, ji. 88. 1872. 

 Anisota Dyar, List N. Amer. Lep., p. 75. 1902. 



Imago. — S and 9 . Head iust visible from above, not entireh" concealed by the prothorax 

 as in Syssphinx. Front rather wide, not narrowing- in front at the la})rum, thus becoming 

 triangular as in Adelocephalahlsi'cta and in Syssphinx; when denuded seems to be flat, somewhat 

 triangular {A. rubiciiii(la, PI. XXXVI. tig. 3), or decidedly so in A. virginiemi.^ (fig. 2); the 

 labrai end of front i— i as wide as between the antenna^, while the surface is full and convex. 

 Antennffi of S bipectinated to a little beyond the middle; 15 pairs of pectinations, the basal pecti- 

 nations about as long as the proximal ones; the joints (12 in number) of the tiliforni end very 

 .short, simple; the vestige.s of the teeth very short and minute, and giving rise to thin tufts of 

 several fine setje. In 9 they are filiform and simple. Palpi .scarcely visible, so short and feeble; 

 but denuded found to be 3-jointed, joints 1-2 of nearly the same length, third joint about two- 

 thirds as long as second. MaxilUv either entirely wanting or minute, vestigial, not visible. I 

 can not discover in S rtdiiciindu and cinjinicii.yis any vestiges of them. 



Fore wings of S short, narrow, subtriangular to triangular (especially in ^4. v/rginiensis); 

 costa curved toward the obtuse or subacute apex: outer edge nearly equal in length to the inner, 

 oblique, and either moderately full or straight. 



Hind wings short and broad, the outer edge convex, or (in ^1. rlrgin'umsls) straight and 

 triangular, with the costa very convex toward the base. The wings reach to the last third or 

 fourth, or near the end of the abdomen. Legs moderately short; the fore tibial epiphysis 

 leaf-like, a little over half to two-thirds as long as tibia: no spurs. 



Venation (PI. XXXIX): as in Eacles, no vein III,; Illj originates about halfway between 

 the origin of anterior discal vein and that of IVj, /. c. beyond the discal cell, while in Cithe- 

 ronia and Eacles, III, arises inside of the origin of the discal vein (PI. LVIII, tig. 5, and p. 56). 

 A. dl>ii<iiiiill.^ diflers in vein III arising a little within the origin of the discal vein, as in 

 Eacles (PI. LVII, tig. 5) the discal veins together forming a regular curved line, those of the 

 hind wings oblique. Other less important ditt'erences in the venation are brought out by the 

 figures of the different species on Plate XXXIX. 



Coloration: The United States forms ochei'ous, bathed with lilac, or in tlie Mexican ^1. dts- 

 simUis with purplish brown fore wings, and blackish hind wings; fore wings with a distinct discal 

 white spot, which is ob.solete on the under side. 



Genitalia (PI. XLI): Compared with those of Adelocephala to which they are in some respects 

 (suranal plate) nearest allied, the suranal plate is much broader, and ends in two thick rounded 

 lobe-like processes; the chitinous end incurved; tip bidentate; the claspers not .so wide as in 

 Syssphinx, but much shorter and stouter than in Adelocephala, and nearer those of S^^ssphinx, 

 tip ending in two unequal projections. The harpes (A) are often well developed, a.s in Citheronia 



>' Scudder has shown that by the end of 1822 only the first twenty signatures of Hiibner's Verzeichniss were 

 printed, the first two signatures only having been printed in 1816, the date on the title-page. Proc. Am. Acad. Arts 

 and Sci., X, 1875, p. 96. 



