78 PROCEEDINGS ENTOMOLOGICAL SOCIETY 



These four forms form a close series, but as they are all 

 from Mexico and the same faunal region I think they are more 

 probably species than varieties. The life histories will have 

 to be studied to clear up this point finally. 



Megalopyge xanthopasa Sepp. 



Phalxna xanthopasa Sepp, Surin. Vlind., i, pi. 14, 1828. 

 Alpis xanthopasa Walker, Cat. Lep. Brit. Mus., v, 1095, 18.">f>. 

 Alpis (?) xanthopasa Kirby, Cat. Lep. Het., 542, 1892. 



Described from French Guiana. The male shows in the 

 figure a white patch at the base of the fore wing, and I think 

 this should have been shown in the female also. The species 

 is close to defoliata Walker, but the white submarginal line is 

 more developed and in the male prominently cuts across the 

 markings. 



Megalopyge amita Schatis. 



Megalopyge amita Schaus, Journ. N. Y. Ent. Soc., viii, 229, 1900. 



The white outer line is here rather prominent, but is now 

 running across the basal purple field which extends outward, 

 leaving only a very narrow yellow margin. The pale discal mark- 

 ing is represented, but there is no white basal patch. The 

 species is from the State of Parana, in Brazil. We have now 

 reached forms differing widely from the operailaris type, and 

 also widely separated geographically. 



Megalopyge undulata Herrich-Schaeffer. 



Chrysopyga undulata Herrich-Schaeffer, Aussereuerop. Schmett., 



fig. 378, 1878. 



Megalopyge undulata Burmeister, Desc. Rep. Argent., v, 27.'!, 1882. 

 Megalopyge fnliginosa Moore, Proc. Lit. Phil. Soc. Liverpool, 



xxvii, 256, 1883. 

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



I have only a female of this form from Rio Janeiro, Brazil. 

 It is a dark brown, the ocherous tint all gone, as is also the 

 paler margin, while the paler outer line and discal mark are 

 prominent. This is clearly a further development of the ten- 

 dencies shown in the preceding species. Berg describes a va- 

 riety vulpiua from the Argentine which, he says, is smaller, 

 the wings more rounded, with slight differences in coloration, 

 all consonant with the distribution into a more temperate cli- 

 mate. 



