546 MR. H. W. BATES ON THE HELICONIDE LEPIDOPTERA 



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 foUows : — 



Var. 1. J. Aureola. 



$ . Size and general colours of I. Orolina. Fore toing : 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. 



Hind 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. 

 Beneatli,\\iQ 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 2 usually does not differ in markings from 

 the c? . It is a mere variety of the ? , but necessary to distinguish, as it connects together 

 the extreme modifications of the species. 



Var. 2. I. Oiicidia. 



?. In size, shape, and markings, similar to I. Orolina. Fore loing : 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 broadl}^ 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 iving 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 antennse black ; head and thorax with a few faint whitish marks. 

 • This variety of the S is interesting, 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 Ilerdina, and its imitator LeptaUs Leuconoe, 

 may have originated. 



Var. 3. I. Chnjsodonia. (PI. LVI. fig. 3 a.) 



Very similar in colours and markings to I. Orolina, but much larger ; the hind wings 

 in the 6 different in shape. 



d 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 



