No. i. BOMBYCINE MOTHS OF NORTH AMERICA— PACKARD. 251 



I append the description of Mr. Druce. 



" o" . The primaries very similar to A. ploetzi, but the white band is closer to the outer 

 margin, four round white spots between the apex and the anal angle. Secondaries pure white 

 excepting the outer margin, which is narrowly bordered with reddish brown, with black and 

 fawn-colored lunular markings as in A. ploetzi; the vitreous spot long, narrowly edged with 

 black, bordered on the inner side with yellow. The underside the same as above. Head and 

 thorax reddish brown, a wide white band at the base of the thorax, the abdomen brown, banded 

 with white; antennae and legs pale yellowish brown. The female the same as the male, but 

 slightly more reddish in color, and with all the vitreous spots considerably larger. 

 "Expanse, o* 7 inches; ? 6£ inches. 



"Hab. west Africa, Cameroon Mountains, Mus. Druce. 



"This very fine species comes into the group containing A. vacuna Westw., A. ploetzi 

 Weymer, from both of which it is at once distinguished by the pure white secondaries." 



ROTHSCHILDIA Grote. 



Rothschildia Grote, Beitrag zur classification der Schmetterlinge, 1896. 



[The following discussion first appeared in Psyche, March, 1902, pp. 322-323:] 

 This name was proposed by Mr. Grote for the American, chiefly neogaeic, species heretofore 

 referred to Attacus. The latter genus, comprising Attacus atlas, A. crameri and A. edwardsii, 

 is restricted to southeastern Asia and the East Indian Archipelago or the oriental region. In 

 fact it is much more closely related to Philosamia than to Rothschildia. From a study of the 

 venation and other features of six species of Rothscliildia, it becomes quite evident that the 

 New World or neogaeic species form a group readily separated 

 from the species of Attacus of the oriental region, both by the 

 larval and imaginal characters, though in the general appear- 

 ance of the moths, the shape of the wings and markings, 

 there is a close resemblance. 



Rothschildia differs from Attacus in the following charac- 



„,, . <■ .... T lui Fig. 32.— Larva of .Rofftsdii'Mia sp. from Arizona. 



ters: the antennae have pectinations nearly one-hall snorter, (Wheeler expedition.) 



and the end of the antenna is subfilif orm ; the palpi are 3- 



jointed, those of Attacus 1-jointed; the fore tibial epiphysis is in Rothschildia narrow, very sharp 



at the end, about half as wide as in Attacus, in which (A. atlas) it is oval, and the end obtuse. 



The fore wings are less falcate than in Attacus, and the hind wings more rounded at the 

 inner angle, not so triangular in outline as in Attacus, nor so much produced posteriorly; 

 indeed they are closely like those of Philosamia. 



In the venation the difference between the Asiatic and American forms is striking; in all 

 the Rothschildia? examined there is no first subcostal vein (or vein II) . In Attacus atlas, crameri, 

 and edwardsii the first branch of the subcostal vein is fully developed, arising at a point near 

 the middle of the discal cell, i. e., within the origin of the common stalk of the other subcostal 

 branches. In this respect it is closely allied to Philosamia, where vein II is present. Vein II 

 is minute, very short; II 3 present, normal. In Rothschildia vein II is wanting, II 2 is a little 

 longer than in Attacus and the other veins of the wings are as in Attacus. The venation of the 

 hind wings is nearly the same in both genera. The wonderful similarity of markings, especially 

 the large, clear discal spots in genera quite remote is an interesting case of convergence. 



The larva of Rothschildia approaches Samia rather than Attacus. That of A. atlas has 

 been well described and carefully figured in all stages by M. Poujade. (Annales Soc. Ent. 

 France, X, 1880, p. 183, PI. 8.) 



The larva of Attacus atlas in its final stage is provided with long finger-shaped tubercles; 

 those, however, on the tergum of the second and third thoracic segments are very different in shape, 

 being large, short and rounded, those on the abdominal segments long and slender. Reduction 

 occurs on the thoracic segments only; the two rows of tubercles on the sides of the thoracic 

 segments are of the same shape, but a little longer than those on the abdominal segments. 



2 



