126 MEMOIRS OF THE NATIONAL ACADEMY OF SCIENCES. 



spines than Brooklyn specimens, and they are white and conspicuous. In the penultimate 

 stage, with a length of 35 mm., the spines are also a little longer and slenderer than in normal 

 E. imperUdiif of the same stage. It might be added that normal E. iinju'riulh larv.e vary in the 

 size of the spines of the infraspiracular series; in one example they arc nearly obsolete, and in 

 another thej^ are well developed. It is well figured by Mr. Joutel on Plate XV. 



Beutenmiiller states that \\\v. junirtntimina is an aberration probal)ly produced b^' cold. 



In the Neumoegen collection of the museum of the Brooklyn Institute there is an Eacles 

 from the City of Mexico which differs from E. iinjirrlalis in the extradiscal line of the fore 

 winfs being near the outer edge, the line being perfectly straight and tirm, not scalloped. Both 

 wings are suffused with reddish brown, and the outer edge of the wings of both pairs partly 

 reddish, not lilac red as in ?J. lmperialu\ the costa is straight and the apex acute. Expanse of 

 fore wings, 112 mm. It may prove to be a form or local variety of E. nnperlalh^ and seems to 

 resemble Schaus's E. manoni. 



Oeographical distrihut'ion. — It has not yet been found north of Massachusetts and' southern 

 New Hampshire: Claremont. N. H. (F. H. Foster); Cambridge, Mass. (Harris); Providence, K. I. 

 (H. L. Clark, J. Bridgham, Deardon); Plattsburg, N. Y. (Hudson); Ithaca, N. Y. (Slingcrland); 

 New York City (Joutel); Pennsylvania (Strecker); New Jersey, "usually common throughout 

 the State," Newark in July (Smith); Cohmilms, Ohio (Tallant); Springfield. Alton. 111. (Riley); 

 St. Louis, Mo. (Riley); Cordova, Mexico (Packard); Jalapa (Druce). Race iiohiU.s, Texas 

 (Neumoegen). 



Pri/>a. — S and 9 . (PI. LVI, figs. 5, 5rt.) Body much thicker than in Adelocephala and 

 Anisota, but the head and thoracic region less full and rounded; the abdominal sutures also less 

 deeply impressed. 



The little spines on the vertex and front of the head are smaller and farther apart than in 

 Adelocephala and Anisota. The i anteiin;e are wider beyond the middle, i. e., on their distal 

 half, than in the two genera named. The maxilUe form a triangular space nearly four times as 

 long as broad, while in the two al)ovo-mentioned genera they form together a nearly equilateral 

 triangle. The S cremaster is stouter, a little shorter, and less deeply forked than in Adelo- 

 cephala and Anisota, while tlie end of the body is much smoother and less coarsely punctured. 

 The ? cremaster is a little stouter, with much coarser graiuilations or bosses, and the spines 

 near the base are longer than in the S . 



There is a group of 6-8 spines on each side of the prothoracic tergum, l)ehind the insertion 

 of the antenna\ which are not present in the two other genera mentioned in which a group of 

 such spines arise from the vertex of the head itself between the l)ase of the antenna-. The iiind 

 edge of the antenute spinose, but the spines are shorter than in Anisota; on the front edge is a 

 series of slight, low, nearly obsolete spines. 



Length of S. 3ti— 1(» nun.; thickness of the body, l-l-lo nun. Length of $ (the large 

 Mexican one), 6o mm.: thickness, 19-20 mm. 



E:^VCI..E;S C^CICXJS (Boiscluval). 



Bamlona cacicus Boisbuval, Annales Soc. Ent. France (4'"" ser. ), YIII, p. 318. 1868. 



Eacks cacicm Walker, Cat. Lep. Het. Br. Mus., VI, p. 1375. 1855.— Kirby, Syn. Cat. Lep. Het., I, p. 743. 1892. 



BasUona imperiiilis Burmeister, Deser. Phys. Rep. Argentine, Atlas, p. 46, PI. xx, fig. 2. 1879. 



Lm-ra. 



(PI. XVII, fig. 2.) 

 Biirmeiifler, PI. XX, fig. 2. 



Boisduval states that this species is very near E. impetnalis. but that the female is much 

 larger. The fore wings of the male are much more pointed and a little falcate; the rose color is 

 replaced by brown, which reflects violaceous tints; the ring-like spot is accompanied toward the 

 costa 1>y a dot of the same hue. Tlie thorax is of the .same brown as the l)ase of the wings. The 

 female offers more decided differences; besides its greater size it is without the Itrown tint at 

 the base of the fore wings, this being replaced by a sinuous basal line. 



