no. i. BOMBYCINE MOTHS OF NORTH AMERICA— PACKARD. 35 



Gonimbrasia Kirby, Syn. Cat. Lep. Het., I, p. 753, 1892. 



Gonimbrasia Rothschild, Nov. Zool., II, p. 39, 1895. 



Gonimbrasia Karsch, Ent. Nachrichten, XXII Jahrg., p. 247, 1896. 



[Type of genus, 0. nictitans (Fabr.), according to Kirby.] 



Imago. — One 9 , one o* . Head in front moderately broad, the sides nearly parallel; the 

 vestiture on the front a little shaggy. Antennas of <? consisting of 27-28 joints, those in the 

 middle being rather long, nearly twice as much so as thick; bipectinate, the two sets of pectina- 

 tions rather far apart ; the tip filiform; the last five joints with vestigial pectinations; 9 about 

 25 joints, well pectinated, the branches of the basal pair nearly twice as long as the joints them- 

 selves and the tip (5-6 joints) simple. Palpi extending to the front; the third joint distinct, 

 quite long. 



Thorax moderately thick, its vestiture rather dense and shaggy. 



Fore wings moderately wide, in <? falcate, costa well arched (more so than in 9 ) to the 

 subacute apex; the outer edge slightly excavated below the apex; outer and inner edges of 

 about the same length. 



Hind wings squarish, costa full and convex at base; apex subrectangular; outer edge 

 subangulated in the middle, decidedly more so in S than $ ; inner angle well rounded; the 

 abdomen only reaching about one-half way to the hindermost edge of whig. 



Venation: That of the fore wings is nearer to Imbrasia than to Nudaurelia, and differing 

 in this respect from Nudaurelia, i. e., the anterior discal vein originates inside of the origins 

 of veins III 2 and III 3 while in Nudaurelia it originates outside; in Imbrasia, the discal and 

 two other veins (III 2 and III 3 ) originate at the same point. Also veins II,, II 2 , and II 3 are 

 well developed, and are as in Imbrasia. 



The discocellulars are directed a little inward instead of outward, as they are in Imbrasia. 

 In the hind wings the venation is nearly as in Imbrasia. 



Markings: There is no ocellus in the fore wings, only a small D-shaped clear area, while 

 on the hind wings there is a large compound ocellus, as in Imbrasia. 



This genus in its venation and markings is more closely allied to Imbrasia than any other, 

 though the hind wings of the male are rounded much as in the female of Imbrasia. The 9 hind 

 wings are much more convex and more rounded than in 9 Imbrasia. It is apparently a more 

 primitive type than Imbrasia, as the larva, when discovered, may possibly show. [Antennae 

 of female not compared, owing to their absence from Dr. Packard's 9 Imbrasia,.] 



The genus entirely differs in venation from Bunaea as here restricted, or from Thyella. 

 G. hyperbius (Westwood) appears to belong to this genus, as the 9 hind wings are full and 

 rounded, and the markings are much as in G. alopia. [G. hyperbius is the type of Cinabra 

 Sonthonnax, 1903.] 



Geographical distribution. — West Africa (Sierra Leone), genus extending across to Matabele 

 Land, southeast Africa (G. hyperbius), or from lat. 10° to 20° S. 



GONIMBRASIA ALOPIA (Westwood). 



Plate XLIV, fig. 4. 



Saturnia alopia Westwood, Proc. Zool. Soc. London, 1849, p. 55. 



Bunaea alopia Walker, Cat. Lep. Het. Brit. Mua., V, p. 1231, 1855. 



Gonimbrasia alopia Kirby, Syn. Cat. Lep. Het., I, p. 753, 1892. 



Nudaurelia alopia Sonthonnax, Annales Lab. d'Etude de la soie, X, p. 26, PI. X, fig. 2, 1901. 



Sonthonnax regards G. intermiscens (Walker) as a synonym. 



Imago. — Two 6* , one 9 . Body and wings scotch-snuff yellow, with an olivaceous tinge, 

 and dusted over with fine dense brownish scales. A narrow wliite prothoracic collar. Antennae 

 of o" with 27-28 joints. Westwood states that there are "34 rays on each side," making 17 

 joints with double pectinations. 



Fore wings with a distinct basal line which is smoky brown within and whitish pink-gray 

 without, widening on the costa, especially just behind the costa (not so zigzag as in the 9 ). 

 Extradiscal lines nearer the discal spot than to the outer edge, pink whitish gray, inclosing a 



