360 Miss Cora B. Sanders on the RJwpalocera 



yellow band, the characteristic feature of the group, is a very 

 special and peculiar one among the numerous patterns and 

 colour combinations of Neotropical synaposematic groups ; 

 (4) that a butterfly which is outlying to-day should be still 

 more outlying seventy-five years ago is not surprising. Rapid 

 change is more probable in a case of this kind than perhaps 

 in an}'- other. On the other side it must be remembered: — 

 (1) that the yellow tints of some butterflies are very apt to 

 darken ; (2) that similar dark forms of Lycorea halia are to 

 be found in collections of much less age, or even occasionally 

 in recent consignments. 



The latter argument, of course, supports both sides of the 

 case. 



It is not too much to hope that the question may be settled 

 by intentional exposure or other experiments upon the yellow 

 pigment of recent s|)ecimens, as well as by the investigation 

 of all available material. 



Miss Sanders and I have already carefully compared the 

 Burchell specimens with the series at Oxford, in the British 

 Museum, and in the Godman-Salvin Collection, and there 

 can be no doubt about the existence of a marked difference 

 between the bands of the Burchell specimens as a whole and 

 those of more recently captured individuals of L. halia. 



When in the later pages of this memoir the Heliconiinse 

 belonging to the same group are recorded, it will be con- 

 venient to reproduce typical examples of as many members 

 as possible by the best photographic processes which we 

 can command. I think that the differences of shade can be 

 accurately rendered in this manner and made available in a 

 half-tone plate.— E. B. P.] 



Ituna lUone, Cram. 



Bz. 12. 11. 26. = 196. Santos. " Forest by S. Bento." 

 Date and name as in Westwood's list. 



III. Sattein^. 

 Pierella lamia, Sulz. 



13. 5. 29. 2 c? = 197, 198. Rio Tocantins, Carolina. ''Boa 



Vista in Sylva densa " on 197. There are two Brazilian 



labels on 198 : " Sylva densa " on one, " 13. 5. 29 Boa 



Esper " on the other. 



Date as in Westwood's list, where, however, only one 



specimen is mentioned. 198, a very poor specimen, was 



