88 MEMOIRS NATIONAL ACADEMY OF SCIENCES. vol. xii, 



Hind wings ochreous tawny inside of the discal oblique small brown streak; beyond, the 

 wing is lilac ash-colored. 



The underside of both wings is uniformly reddish-ochreous, with no discal spot or any 

 lines. 



The female, according to Cramer's figure, differs in being much larger; the fore wings are 

 dark vandyke brown, and with a basal angulated line and an extradiscal straight white line; 

 in the middle of the wing is a long white line nearly parallel with the inner edge, which sends 

 off a fork or branch inward, part way toward the costa. Hind wings as in the o* . 

 Expanse of the fore wings, 6* 78 mm. 

 Length of a fore wing, 6" 40 mm. 

 Breadth of a fore wing, S 24 mm. 

 Length of hind wing, <? 33 mm. 

 Breadth of hind wing, <3 26 mm. 

 Geographical distribution. — Surinam; Cayenne (Donckier). 

 My example comes from French Cayenne. 



Larva. — It is described and figured by Stoll as rather long, cylindrical, with a long single 

 slender spine (not a fasciculus of several branching spines as in the more specialized larvae of 

 Automeris, Hemileuca, Pseudohazis, and Coloradia). Each spine arises directly from the surface, 

 there apparently being no definite tubercle giving origin to it. The spines are setose. Body 

 pale yellowish green; head green, and over the skin are scattered obscure red dots. The two 

 first and the last segments have long tufts (touffes) nearly as long as the body is thick, with 

 green hairs, and are yellow at the end. The other segments have each three similar "hairs" 

 (spines), but smaller and simply green. Thoracic legs pale flesh colored; abdominal ones blue 

 and red, and the anal ones are violet and beneath pink-red. 



Cocoon. — Round, dense, gray, resembling that of Saturnia pavonia-major. It remains in the 

 pupa state 10 or 11 days. Food plant, the locos tree in the forests of Surinam. 



THAUMA Hy. Edwards. 



Thauma Hy. Edwards, Proc. Calif. Acad. Sci., V (1875), p. 265. 



THAUMA SOCIALIS Feist. 



Plate LXIII, fig. 8. 



[Bombyx socialis Feisthamel. Lepidopteres Nouveaux recueillis pendant le voyage autour du Monde de la Favorite 

 sous le commandement de M. Laplace, capitaine de fregate, illustres et decrits par M. le baron Feisthamel, 

 in Guerin's Magasin de Zoologie, vol. 9, 1839, part 18, page 3. 



Feisthamel 's description is as follows: 



"Alis cinereis, anticis strigis duabus maculaque obliqua albidis; posticis immaculatis; 

 omnibus subtus striga communi alba. 



"Les ailes sont d'un gris cendre, ayant a leur base des touffes de poils longs et roussatres; 

 les superieures, pr6sentent, sur le milieu de l'aile, une tache blanche ayant la forme d'un 7 

 dont la queue est tournee vers la base, la pointe superieure de ce chiffre tombant plus ou moins 

 a une raie blanche, sinuee et transverse. 



"Les inferieures sont sans taches; le dessous des ailes est semblable au dessus, a l'excep- 

 tion d'une bande blanche sinuee, qui traverse horizontalement les ailes inferieures. 



"Le corps est gris-roussatre ; le corselet est couvert de longs poils bruns; les antennes 

 sont d'un blanc sale; le tete et les pattes sont brunes. 



"Nous n'avons vu que la femelle. 



"II setrouveau Chili."] 



The female abdomen reaches to end of hind wing. Antennae simple as in Dirphia, judging 

 by Edwards's excellent photograph. The female differs from D. Jioegei; it is very near D. 

 hoegei, but the wings are not quite so wide; a white discal spot extending to[ward] but not 

 reaching costa, and also along the vein III to middle of wing. The thorax has thickened hairs. 

 Extradiscal line as in D. hoegei; other lines white and arranged as in hoegei. Perhaps a true 



