426 Messrs. J. J. Joicey and W. J. Kaye on 



155 against 731 melpomene. Usually individuals of erato 

 outnumber the individuals of melpomene; and even in 

 British Guiana Melpomeniformes are much rarer than 

 Eratoformes, while in some districts, such as m the Potaro 

 district in Central British Guiana, Melpomeniformes hardly 

 exist at all, while numbers of Eratoformes are to be 

 found It 'is possible that where typical melpomene 

 occurs, such as in British Guiana, it is always m a 

 minority; while where it varies enormously it becomes 

 commoner. . 



Of erato magnified, Biff., there is but one specimen, thus 

 closely following the paucity of typical melpomene speci- 

 mens of which there are eight specimens only. 



Of erato callista, Riff., there are two rather undersized 

 specimens. m . 



Of erato calhcopis there is a single pair as figured by 

 Cramer in the two forms PI. 190, figs. E, E. Fig. E is quoted 

 and re-figured by Seitz, PI. 78c, and thus fig. E should be 

 re-named, because it is a constantly recurring aberration. 

 We therefore propose the name belUcopis for the form E 

 (on Cramer's Plate 190, Pap. Ex. ii). 



One other form with a black hind-wing is represented 

 by a single specimen. It is a form close to elimaea, Erichs., 

 but has the transverse band less broken up into spots than 

 in typical elimaea. It is more like the above belticopis, 

 with a red basal area. _ 



There are very few forms connecting the streaked 

 hind-wing to the plain black hind-wing. The most inter- 

 mediate forms are— (1) anandremona; and (2) an udalnca 

 form with very slight streaking. As with the melpomene 

 a lar<re percentage of the Eratoformes show a slender 

 streaking, less in width than is found on the lower Amazon 

 about Santaren and Obydos. 



There are no less than forty-four specimens of the andre- 

 mona form; these all have the typical open arrangement 

 of red spotting, and more than half (twenty-six) show a 

 rudimentary superimposed pattern of yellow on these 

 spots. Six show yellow scaling all over the ' ihelxiope 

 yellow-spotted area, while the remaining twenty graduate 

 down to the typical andremona. It is noticeable that 

 those specimens showing only a portion of the " thelxiope 

 over-spotting have scales which are usually white The 

 commencement of the spotting seems to take place first in 

 the cell. Eight specimens show more or less a white super- 



