260 MR. R. SHELFORD OX MIMETIC IXSECTS' AXD [Xov. 4, 



closely similar in wing pattern and colour (compare G.gs. 7 & 8, 

 Plate XXI.); their coloration recalls that of Ileliconius chjsonymus 

 (Latr.) and H. ricini (L.) of S. America and of the common 

 Oi'iental (JeUtosia hypsea. 



[The majority of the Chalcosid synaposemes named in Table IV. 

 are shown on Plate XXL, together with their Enplceine, Pierine, 

 and Agaiistid models. The i-esemblance to the Pierince is so much 

 more sti-iking 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 XXL). Delias cathara (Grose-Smith) is very 

 rare, whilst its mimic Callamesia 2neridoides (Wlk.) (compare figs. 

 5 & 6) is comparatively common, a fact which supports the MUlleiian 

 interpretation. A comparison of the wdiole series of Chalcosid 

 mimics and their models leaves no doubt that the moth is the 

 mimic and the butterfly the model, even thoixgh 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 Xeptides, all of which are highly distasteful. The 

 association in this case is probably Miillerian. 



The extremely common Lycpenidaj Eoxylides iharis, Dr^tpadia 

 hoisduvalii, and Biduanda thesmia are mimicked by Thrix gama, 

 by Araotes lapithis, and by For it la plateni. In this case the 

 mimicry is -Batesian. Mr. de Xiceville, in his ' Butterflies of 

 India,' vol. iii. p. 11, gives a list of mimetic Lycsenidse compiled 

 by Doherty, but he informs me that Doherty conducted no 

 experiments to prove the correctness of his associa,tion of the 

 various species in mimetic examples. I am, however, quite 

 certain that U. tharis, D. boisduvalii, and B. thesmia are distaste- 

 ful species, wdiilst the great rarity of the mimicking species 

 points to the conckision that they are Batesian mimics. 



Y. 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 post- 

 pone the compilation and discussion of such a list imtil 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. 



i. Mimic. Laphria sp. near terminalis (v. d. Wulp). Plate XXII. 

 fig. 10. 

 Model. Salius sericosoma (Smith). Plate XXII. fig. 9. 



This large and handsome fly is not infrequently met with in 

 the neighbourhood of Kiiching, and the immunity which it 



