260 MR. R. SHELFORD ON MIMETIC INSECTS AND [Nov. 4, 
closely similar in wing pattern and colour (compare figs. 7 & 8, 
Plate XXI.); their coloration recalls that of Heliconius clysonymus 
(Latr.) and H. ricini (.) of S. America and of the common 
Oriental Cethosia hypsea. 
{The majority of the Chaleosid synaposemes named in Table LV. 
are shown on Plate XXI., together with their Eupleeine, Pierine, 
and Agaristid models. The resemblance to the Pierine is so much 
more striking and the patterns so much more detailed and varied on 
the under sides of the wings, that this aspect is alone represented 
in the case of both Pierime models and their Miillerian mimics 
(figs. 1 to 6, Plate XXI.).  Delias cathara (Grose-Smith) is very 
vare, whilst its mimic Callamesia pieridoides (W1k.) (compare figs. 
5) & 6) is comparatively common,a fact which supports the Miillerian 
interpretation. A comparison of the whole series of Chalcosid 
mimics and their models leaves no doubt that the moth is the 
mimic and the butterfly the model, even though the former be 
common and the latter rare.—E. B. P.| 
The species of Symbrenthia and of Athyma have a close resem- 
blance to the Neptides, all of which are highly distasteful. The 
association in this case is probably Miillerian. 
The extremely common Lycenide Hoxylides tharis, Drupadia 
boisduvalii, and ‘Biduanda thesmia are mimicked by Thrix gama, 
by dAraotes lapithis, and by Poritia plateni. In this case the 
mimicry is Batesian. Mr. de Nicéville, in his ‘ Butterflies of 
India,’ vol. iii. p. 11, gives a list of mimetic Lyceenidee compiled 
by Doher ty, but he informs me that Doherty conducted no 
experiments to prove the correctness of his association of the 
various species in mimetic examples. I am, however, quite 
certain that 2. tharis, D. boisduvalii, and B. thesmia are distaste- 
ful species, whilst the great rarity of the mimicking species 
points to the conclusion that they are Batesian mimics. 
V. DIPTERA AS MIMICS. 
A complete list of the mimetic flies of Borneo would comprise 
at least one-third of the total number of species, but inasmuch as 
the hterature on the Malayan Diptera and their Hymenopterous 
models is both scanty and scattered, I think it advisable to post- 
pone the compilation and discussion of such a list until our know- 
ledge of these two orders as represented in the East is increased 
and more systematized. I therefore select for special notice and 
description eight species only, each of which exhibits some note- 
worthy modifications of structure and habit, produced in the 
attainment of a likeness to its respective mimic. 
Mimic. Zaphria sp. near terminalis (v.d. Wulp). Plate XXIT: 
fig. 10. 
Model. Salius sericosoma (Smith). Plate XXII. fig. 9. 
This large and handsome fly is not infrequently met with in 
the neighbourhood of Kuching, and the immunity which it 
P39] 
J 
