546 MR. H. W 
to have reached an advanced stage of segregation from the parental stock. They all fly 
together in the same places, and their differences are so slight and graduated that they 
cannot fittingly be treated as independent forms or species . They are as follows : 
Var. 1. I. Aureola. 
$ . Size and general colours of I. Orolina. Fore wing : above, with a complete black 
border; the apical part has a large, broad, oblong, opake orange spot occupying more 
than one-third of the wing ; posteriorly the spot reaches only the 2nd median branch, but 
covers entirely the 3rd ; interiorly it is bordered by the short dusky belt running across 
the end of the cell : rest of the wing clear, transparent. Beneath, the same, except that 
there are three greyish-white spots at the apex. 
Rind wing clear, transparent, the nervures edged with blackish ; costal and posterior 
margins widely bordered with blackish, the latter having a rufous line in the centre. 
Beneath,the margins are orange-coloured, bordered with blackish, the margin without spots. 
Body and antennae black ; thorax with a few faint whitish marks. 
Found in company with I. Orolina, whose $ usually does not differ in markings from 
the 6 . It is a mere variety of the $ , but necessary to distinguish, as it connects together 
the extreme modifications of the species. 
Var. 2. I. Oncidia. 
$ . In size, shape, and markings, similar to I. Orolina. Fore wmg : above, with a 
complete narrow dusky border ; the apical part has an arcuated orange belt, which is in- 
distinctly limited on the inner side, but reaches nearly the hind angle, and leaves both the 
2nd and 3rd median branches visible for the greater part of their length ; rest of the wing 
transparent : the cell in middle part is broadly fuliginous ; there is a thick dusky belt 
across the end of the cell, and the median branches are edged with blackish ; a spot over 
the end of the cell and two spots between the median branches milky white. Beneath, 
the same, except that the apical margin of the wing has a greyish- white stripe. 
Hind wing broadly margined with blackish, the hind border having in the middle a 
narrow orange-coloured line ; the whole of the discal portion, with its nervures, milky 
white. Beneath, the same, except that the margins have a broadish orange line, widely 
margined with dusky, and the apex has a short greyish-white stripe. 
Body and antenna? black ; head and thorax with a few faint whitish marks. 
This variety of the 2 is interestin g, as furnishing proof of the variability in colour, from 
smoky hyaline to milky white, of the discal portions of the wings and their nervures. 
We can understand from this how Ithomia Eerdina, and its imitator Leptalis Leuconoe, 
may have originated. 
Var. 3. I. Chrysodonia. (PL LVI. fig. 3 a.) 
Very similar in colours and markings to I. Orolina, but much larger ; the hind wings 
in the <S different in shape. 
<$ 2 . Expanse 2" 1'". Fore wing the same in colours and markings as I. Orolina 
(fig. cit.), the only differences being that the orange belt of the apical border is neatly 
margined with blackish on its inner side, between the 2nd and 3rd median branches, and 
