36 MEMOIRS NATIONAL ACADEMY OF SCIENCES. vol. xn, 



narrow dark brown line in the inner edge. Discal spot triangular, clear, becoming suboval, 

 more in <? than 9 , where it is distinctly D-shaped; it is small (about 2 by 1 mm.). 



Hind wings concolorous with the fore wings, with a whitish discoloration at the base; the 

 base and costal region suffused with deep reddish pink, extending to the discal spot and flooding 

 the basal line, which is broad, diffuse. Extradiscal line broad, smoky, dark, pale within, and 

 bordering the discal ocellus, which is very large, round, very slightly oval (10 by 8 J mm.) ; the 

 center triangular, not so wide, distinct or clear as in the fore wings, this clear space situated in 

 a deep snuff-yellow area inclosed by a black ring which is encircled by a much broader pale 

 olivaceous pink-gray ring. Under side of the wings washed with hoary pink, especially toward 

 the apex on each side of the extradiscal line; basal line obsolete on each side. Discal spot 

 distinct on the fore wings, obsolete on the hind wings, the clear central spot more distinct than 

 the rest of the ocellus. 



Expanse of the fore wings, S 100 mm.; 9 82 mm. 



Length of one fore wing, <$ 45 mm. ; 9 40 mm. 



Breadth of one fore wing, s 24 mm. ; 9 20 mm. 



Length of a hind wing, <? 32 mm.; 9 27 mm. 



Breadth of a hind wing, e 27 mm.; 9 20 mm. 



Geographical distribution. — Sierra Leone; the $ pupated in July, 1895, emerged January, 



1896, in England. No. 19190, Schaus collection. American Museum of Natural History, 



New York. 



GONIMBRASIA ACETES (Westwood). 



Saturnia acetes Westwood [Proc. Zool. Soc. Lond., 1849, p. 53]. 



Bunaea acetes Maassen and Weymer, Beitrage Schmett., figs. 108-111, 1885. 



Bunaea acetes Kirby, Syn. Cat. Lep. Het., I, p. 752, 1892. 



Gonimbrasia acetes Rothschild. Nov. Zool., II, p. 38, 1895. 



GONIMBRASIA ERYTHROTES (Karsch). 



Bunaea erythrotes Karsch. 



Gonimbrasia erythrotes Rothschild, Nov. Zool., II, p. 38., 1895. 



THYELLA Felder. 

 [Antheraea Walker, in part, Cat. Lep. Het. Brit. Mus., V (1855), p. 1244.] 



[It is impossible to use Thyella in the sense here employed. The name was first used by 

 Wallengren (Oefv. Vet. Akad. Forh. vol. 15, p. 141; 1858) for a genus to include T. nyctalops 

 Wallengr., which was designated as the "species typica," and was said to be allied to Bunaea 

 alcinoe (Cram.), as I am informed by Dr. G. M. Allen. There is also a Thyella Desv., 1863 

 (Diptera) and a Thyella Adams, 1865 (Mollusca) ; both prior to Felder's use of the name.] 



Imago. — cT and 9 . Head broad in front, much as in Gynanisa, and Acanthocampa belina. 

 Male antennae broad, plumose, subfiliform at tip, the pectinations thicker than in Gynanisa, 

 those of both pairs of the same length, the joints a little longer than thick. Palpi very broad, 

 with long hairs below, third joint minute, scarcely visible, porrect or depressed, reaching a 

 little beyond the front. No maxillae. Thorax stout, a well-defined prothoracic coUar, as in 

 Gynanisa. Fore wings as in Gynanisa, but a little more curved on the costa toward the apex, 

 but the wing is not falcate, and is a little shorter and broader than in Gynanisa; the outer edge 

 not excavated, and the edges of neither wings are scalloped. Hind wings with the apex not 

 so round as in A. belina, not produced toward the apex, and the outer edge is full and convex; 

 they reach well beyond the end of the S abdomen, but in 9 only to the end. The hairs on 

 the thorax and on the inner edge of the hind wings are very long and shaggy. 



Venation: Vein IL. arising opposite or within the anterior discal vein, and very near the 

 common stalk of veins II 2 and II 3 ; vein III 2 either nearly in the middle of the discal cell, or 

 arising at a common point of origin of veins III 1( III 2 and the anterior discal vein; the discal 

 cell narrow. Hind wing with discal cell rather narrow. Discal veins situated exactly midway 

 between the base and outer edge of the wing; and vein III detached and nearly independent. 



