Ixxxiil, Ixxxiv| Cea) 
caught to pass muster easily on a casual view ; and, as has 
been seen, it did actually delude one human observer. 
“There can, I think, be little doubt that this resemblance 
is significant. The usual aspect of Jaxias is rather widely 
departed from by both sexes of J. veinwardtit and its immediate 
allies, but, as so often is the case, the mimetic approach to 
another genus is confined to the female. Through the kind- 
ness of Professor Poulton Iam able to exhibit a male example 
of Iaias baliensis which is especially interesting as being one 
of the actual specimens caught by Mr. Wallace during his 
memorable visit to the Malay Archipelago. It will be seen 
that the male has no share in the mimetic garb of his mate. 
“Tt is noticeable that the appearance of these specimens of 
Hf. corva from Bali differs from that of ordinary examples of 
H. nerissa in the fact that the hind-wing of both sexes shows 
a rather pronounced dark border ; this in the female being 
brought about by an almost complete fusion of the submarginal 
row of dark spots, commonly found in that sex of the species, 
with the dark margin itself. This brings the hind-wing of 
the model into close correspondence with that of the mimic, 
a correspondence which does not exist in the case of the 
usual form of the model. It is of course conceivable that 
this special feature in the Huphina is merely accidental ; 
but in view of the fact that a similar condition is usual in 
Ixias, whereas in H. nerissa it is practically confined to 
the particular form that is mimicked by Jvias, it seems more 
explicable as a case of diaposematism—a principle which ex- 
perience is continually showing to be very widely prevalent. 
“In this instance the Huphinaw has on the whole acted as 
the model, under whose influence the Jzias has drifted some 
distance away from the usual aspect of its genus. But in the 
particular case of the hind-wing the process is reversed ; the 
Lxias has been the model, and has in its turn been mimicked 
by the Huphina. 
‘““We have some direct evidence that H. nerissa is disliked 
by insectivorous birds. I am not aware of any such evidence 
in the case of Jaias. But if the foregoing conclusions are 
well founded, the association between the two must necessaril y 
be Miillerian and not Batesian.” 
