ia Dr. F. A. Dixey on the Relation of 
exhibited by P. phaloe; but whereas in Mylothris the 
main red streak of the hindwing arises from the internal 
and median basal red, and js central (Fig. 5, cd), in 
Hesperocharis it results from a development of the pre- 
costal and costal red patches, and occupies the correspond- 
ing regions of the wing (Fig. 12, a, b). The precostal 
red is undeveloped in Mylothris, and the median red is 
undeveloped in JLesperocharis. One result of this 
is that in the latter form the relative position of the main 
yellow and red streaks is reversed; notwithstanding 
which the general resemblance to Mylothris is consider- 
able, and the difference would very probably remain 
undetected by many insectivorous animals. ‘The present 
point has already been noticed by me elsewhere.* I draw 
attention to it here simply because it affords another 
illustration of the gradual growth of mimetic patterns 
from an original non-mimetic form. +t 
III. Recrrprocat Mimicry Between IneprsteE Forms. 
In the previous communication to the Entomological 
Society{ of which I have already made mention, I drew 
attention to certain facts which I am now able to illustrate 
by Pl. V., Figs. 13 and 14, representing the undersides of 
a Pierine (Pereute leucodiosime) and a Heliconius (H. mel- 
pomene) respectively. Both Heliconius and Perewte are, 
it will be seen, furnished with basal red spots, and this is 
the case with very many of the Heliconw and their 
* Trans. Ent. Soc. Lond., 1894, p. 286. 
+ Throughout the foregoing remarks, P. phaloe and P. locusta 2, 
have been spoken of as non-mimetic forms. This is undoubtedly 
the case with P. phaloe, but it is perhaps possible that even in © 
P. locusta @, the underside of the hindwing may have (especially 
in darkly-coloured individuals) a certain mimetic value. The 
underside of the hindwing in P. locusta, P. cinerea and some 
others resembles that of Heliconius melpomene and other protected 
species in giving the general idea of a dark wing-area with yellow 
costal or precostal streak and basal red spots. The forewing of 
P. locusta contains a large surface of white, but this would be 
partly or wholly concealed in the resting position. It is true also 
that the yellow streak and red patches do not occupy exactly 
corresponding positions in the Pierts and the Heliconius ; but there 
is abundant evidence to show that while affinity displays great 
respect for the exact position on the wing of any given feature 
of the pattern, mimicry to a large extent disregards this, and aims 
rather at a general similarity of effect. See the instance of 
Hesperocharis hirlanda above, and see also below, p. 74, note. 
ft Trans, Ent. Soc. Lond., 1894, pp. 296, etc 
