74 PROCEEDINGS ENTOMOLOGICAL SOCIETY 



Wing without a yellow margin 



Subterminal line narrow, broken, remote from mar- 

 gin ............................................. govana Schaus 



Subterminal line broad, shaded, "" Herrich- 



rather near the margin 



Wing less elongate, the outer margin more convex; costa 

 not black-marked beyond outer fourth- 



Male with a white subterminal band ..... amita Schaus 



Male without such a band- 



White markings forming a row of spots between 

 the veins outwardly .................... ornata Druce 



White markings more generally developed but not 

 forming distinct outer spots 



opercularis Smith and Abbot 

 Fore wing with a pale whitish patch at base: 



Outer margin clear yellow, the basal shading dark and purplish- 

 Male with an outer white line ..................... xanthopasa Sepp 



Male without such a line ............................. dcjoliata Walker 



Outer margin overspread with brown 



Female dark brown, without distinct outer pale line 



trnjillo Schaus 



Female a little paler and more diversified, with more distinct 

 traces of an outer pale line .......................... trnjillina Dyar 



Female with yellow under-ground still more diversified 



codiopteris Dyar 



Megalopyge salebrosa Clemens. 



Oylothrix salebrosa Clemens, Proc. Acad. Nat. Sci. Phil.,xii, 522 



1860. 



Gasina agdamea Druce, Ann. Mag, Nat. Hist. (0) v, 216, IS'.tO. 

 Oylothrix salebrosa Kirby, Cat. Lep. Het., 775, 1S!2. 

 Megalopyge agdamea Kirby, Cat. Lep. Het., 846, 1892. 

 Gasina agdamea Druce, Biol. Cent. -Am., 'Lep. Het., ii, 431, 1S!7. 



I have this well-marked species from Orizaba, Jalapa, and 

 Coatepec, Mexico. Druce had also a specimen from Guate- 

 mala. It is not very close to our opercularis, but is the first 

 species in which the yellow ground and dark basal shadings 

 appear. With its row of submarginal dashes it recalls M. 

 mida Cramer, a species of another group, and also, by a 

 change of color, forms a starting-point for the albicolis group. 

 This seems to be a synthetic form and perhaps indicates the 

 origin of the group. I have determined this species as Mega- 

 lopyge tharops Stoll, but further study of Stoll's figure indi- 



