OP WASHINGTON, VOLUME XII, 1910. 75 



cates that this is improbable. The figure may be very poor, 

 but it represents a black patch below the end of the cell, which 

 is the very part of the wing where salebrosa never has a black 

 mark. I have not been able to identify Stoll's figure with 

 specimens, but can not think that it can possibly be a syno- 

 nym of Megalopyge lanata Stoll, as it has been referred. 



Megalopyge agesistrata Druce. 



Gasina agesistrata Druce, Ann. Mag. Nat. Hist. (<i), v, 217, 1800. 



Megalopyge agesistrata Kirby, Cat. Lep. Het., 84(i, 1892. 



Gasina agesistrata Druce, Biol. Cent. -Am., Lep. Het., ii,432, 1S97 



I have no specimens of this species, but it is evident from 

 the figures that it is a form in which the basal dark shadings 

 are much reduced and have retreated from the margin of the 

 wing. It is reported from Central America and the east coast 

 region of Mexico. 



Megalopyge bissesa Dyar. 



In this species there is a wide yellow margin on the wing 

 which is unusually sharply limited and distinct. It is known 

 from the edge of the Mexican tableland and from Arizona. It 

 is a more northerly distributed form, yet does not come as 

 close to our opercularis as does the following. 



Megalopyge ornata Diuce. 



Lagoa ornata Druce, Biol. Cent.-Am., Lep. Het., i. 214, 1S87. 

 Lagoa ornata Kirby, Cat. Lep. Het., 472, 1892. 



This species is not figured in the Biologia, but I think that 

 I have correctly identified it. One of my species is labeled 

 "agesistrata" and a specimen of the following speciemens is 

 labeled "ornata" . The determinations are by Mr. Schaus, and 

 his work was carefully done. However, I think both deter- 

 minations are wrong, due to the special difficulties of the case. 

 The specimen labeled " ornata" is so close to what I take to 

 be the real ornata that the misidentification might easily be 

 made unless the localities were specially considered. I iden- 

 tify specimens from Druce's type locality, Cordoba, Mexico, 

 and refer the Venezuelan specimen to the following. We have 

 here a species closely allied to our opercularis, in fact distin- 

 guished only by minor characters, the distribution of the fugi- 

 tive white-scaling on the wing. In ornata the white forms 

 a row of submarginal dots which are not developed in oper- 

 cularis. This form is apparently the one that gave rise to our 

 opercularis, the habitats of the two being continuous along 



