Mimetic Patterns to the Original Form. 75 
The same argument will apply to features similar to 
the above which may be seen in certain Papilionine, 
Nymphaline, Erycinide, and even in some moths. 
And I may say in passing that Fritz Miiller’s principle 
here referred to appears to me to be of much wider 
application than has been hitherto supposed. There 
exist several large groups more or less uniform in their 
scheme of coloration, though heterogeneous in their 
affinities, which it seems almost certain will in the main 
turn out to be cases of ‘‘inedible associations,” each 
one possibly including a few instances of true mimicry 
within its borders. In deciding on the actual nature 
of such resemblances, it may be borne in mind that 
‘reciprocal mimicry ” constitutes good evidence of the 
distastefulness of all the forms between which it can be 
shown to occur, while the abundance or scarcity of a 
mimetic insect is also a valuable test of its edibility. 
IV. Divercent Mempers or AN INEDIBLE Group. 
The last set of figures (Pl. V., Figs. 15-18) discloses a re- 
markable state of things, which is of interest both in its 
bearing on what has been advanced in the preceding sec- 
tion, and also as providing a further illustration of the im- 
portance of small changes. The Papilio represented in 
Fig. 15 (P. zacynthus ¢) is undoubtedly the model for the 
Pierine shown in Fig. 16 (H. tereas). These two insects 
form one of Bates’s original instances of mimicry. But 
beside the latter we have another Huterpe, viz., H. bellona 
(Fig. 17), whose markings are, without doubt, homologous 
with those of its congener. H. bellona however, though 
so closely resembling H. tereas the mimic of P. zacynthus, 
itself copies, not the Papilio, but the members of a group 
of Heliconius of which H. erato (Fig. 18) is a good 
example. ‘I'he bright yellow patch on the forewing of 
the Heliconius is very well imitated by the Pierine, and 
on the hindwing of the latter the crimson patch of 
E. tereas, etc , has been modified into a series of scarlet 
stripes; these being a palpable attempt to reproduce 
the radiating chestnut streaks of H. erato or one of its 
congeners. It is curious to see what slight modifications 
between the two species of Huterpe enable them to 
