126 MEMOIRS OF THE NATIONAL ACADEMY OF SCIENCES. 



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

 stage, with a leng-th of 35 nmi., the spines are also a little Ioniser and slenderer than in normal 

 E. impi't'htUx of the same stage. It might be added that noi-mal E. uuperiallx lai'va? vary in the 

 size of the spines of the infraspiracular series: in one example they are nearly obsolete, and in 

 another they are well developed. It is well tigured by Mr. .Toutel on Plate XV. 



Beutenmiiller states that var. pxnctatissima is an aberration prol>ably produced by 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.liiipti'iaUs in the extradiscal line of the fore 

 wings being near the outer edge, the line being perfectly straight and firm, 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 E. inrp<'ri(di'<: the costa is straight and the apex acute. Expanse of 

 fore wings, 112 nun. It may prove to be a form oi' local variety of E. imperial Is, and seems to 

 resemble Schaus's E. uKtKoni. 



Gcographicdl disfrihiitiim. — It has not yet been found north of Massachusetts and southern 

 New Hampshire; Claremont, N. H. (F. II. Foster): Caml>ridge, !Mass. (Harris); Providence. K. I. 

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

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

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

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

 (Neumoegen). 



Pupa. — S and 9 . (PI. L\'I, figs. 5, wi.) Body nuich thicker than in Adelocepliala and 

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

 deeplj' impressed. 



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

 Adelocepliala and Anisota. The S antennse are wider beyond the middle, i. e., on their distal 

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

 long as broad, while in the two above-mentioned genera they form together a nearly ecjuilateral 

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

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

 The 9 cremaster is a little stouter, with nuicli coai'ser graiudations 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, behind the insertion 

 of the antenna^, which are not present in the two other genera mentioned in which a gi'oup of 

 such spines arise from the vertex of the head itself between the base of the antenna?. The hind 

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

 series of slight, low, nearly obsolete spines. 



Length of i. 36— J-o mm.: thickness of tli(> body. 11-1.'> mm. Length of 9 (the lai'ge 

 ^lexical! one), (io mm.; thickness. lM-20 mm. 



J-:.A.CI.KS CA.CICXJS ^B^>isallv:^l). 



Basilona cucicnn Hoisdivai., Annales Soc. Ent. France (4""-' ser. ), VIII, p. 318. 1868. 



Eadfs cacicun Walker, Cat. I^p. Het. Br. Mus., VI, p. 1375. 18.5.5.— Kirby, Syn. Cat. Lep. Het., I, p. 743. 1892. 



Basilona imperialii Burmkister, Descr. Phys. Eep. Argentine, Atlas, p. 46, PI. xx, fig. 2. 1879. 



Larra. 



(PI. XVII, fig. 2.) 

 Biirmeister, PI. XX, fig. 2. 



Boisduval states that this species is very near Ji^. imperiah'if. but that tlie finuale i- 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 by a dot of the same hue. The thorax is of the same brown as the base of the wings. The 

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

 the base of the fore wings, this being n^placed l)y a sinuous basal line. 



