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Show '260 MR. R. SnEI.FORD ON MIMETIC INSECTS AND [Nov. 4, closely similar in wing pattern and colour (compare figs. 7 & 8, Plate X X I.); their coloration recalls that of Heliconius clysonymus (Latr.) and H. ricini (L.) of S. America and of the common Oriental Cethosia hypsea. [The majority of the Chalcosid synaposemes named in Table I\ . are shown on Plate X X I., together with their Euplceine, Pierine, and Agaristid models. The resemblance to the Pierince 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 Pierine models and their Miillerian mimics (figs. 1 to 6, Plate XXI.). Delias cathara (Grose-Smith) is very rare, whilst its mimic Callamesia pieridoides (Wlk.) (compare figs. 5 it 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 resemblance to the Neptides, all of which are highly distasteful. The association in this case is probably Miillerian. The extremely common Lycsenidse Eoxylides tharis, Drupadia hoisduvalii, and Biduanda thesmia are mimicked by Thrix gam,a, by Araotes lapithis, and by Poritia plateni. In this case the mimicry is Batesian. Mr. de Niceville, in his ‘ Butterflies of India,' vol. iii. p. 11, gives a list of mimetic Lycsenidfe compiled by Doherty, 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 K. tharis, D. boisduvalii, and />. thesmia are distasteful 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 literature on the Malayan Diptera and their Hymenopterous models is both scanty and scattered, I think it advisable to postpone the compilation and discussion of such a list until our knowledge 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 noteworthy modifications of structure and habit, produced in the attainment of a likeness to its respective mimic. i. Mimic. Laphria sp. near terminalis (v. d. Wulp). Plate XXII. fig. 10. Model. Salius sericosoma (Smith). Plate X X II. fig. 9. This large and handsome fly is not infrequently met with in the neighbourhood of Kuching, and the immunity which it |