252 MR. R. SHELFORD OX MIMETIC INSECTS AXD [Nov. 4, 



of the group in which it is manifest, the abundance and wide 

 range of individuals in the species as well as of the species them- 

 selves, together with the remarkable predominance of mimetic 

 resemblances among them — all tended to create a strong suspicion 

 that the mimicry is Miillerian (synaposematic). This suspicion 

 is now justified. The discovery of many Bornean Longicorn 

 mimics of Clytince renders it in every way probable that the 

 group is specially defended by some unpalatable quality, and 

 sometimes develops warning colours of its own which are decep- 

 tively resembled by other beetles, although it usually makes use 

 of warning' colours which are common to more aggressive and 

 even more highly-protected insects. Thus the conclusions which 

 were found to hold in the case of the Cleridse (p. 248) also apply, 

 with equal probability, to the ChjtincB. Since the above was 

 written Mr. Gahan has shown me a beautiful example of Batesian 

 or Miillerian mimicry within the group of Clytince, the common 

 Demonax tocdkeri (Pasc.) being resembled in the closest manner 

 by the rarer Perissus myops (Chev.). Both beetles had come to 

 the British Museum in a single consignment from Ceylon. 

 There is similarly a very remarkable resemblance, probably 

 Miillerian, between Xylotreclius j^^destris and Demonax viverra 

 (compare figs. 29 & 35 on Plate XX.).— E. B. P.] 



COLEOPTERA OTHER THAX LoXGICORXS AS MiMICS. 



Mimic. TilUcera sp., near hibalteata (Gorh.) (Fam. Cleridse). 



Plate XXIII. fig. 49. 

 Model. Mutilla sp. near urania (Sm.). Plate XXIII. fig. 48. 



The Mutilla has a red head and thorax and black abdomen, 

 the second abdominal segment beai-s a white spot, the third 

 segment is covered with a creamy white pubescence. In the 

 beetle, the eyes and front of head are black, the vertex of the head 

 and the prothorax are red ; the elytra are black with one white 

 band replacing the white spot and another sub-apical band 

 paralleling the white abdominal segment of the Mutilla. Curiously 

 enough, the male of this species of Mutilla bears a white band in 

 place of a white spot, and hence the beetle more closely approaches 

 the male than the female in its markings : still there is no question 

 as to which sex serves as the model in this case. 



Several specimens of the same species of TilUcera and of a 

 closely-allied one are in the Hope Collection, Oxford, all collected 

 by Dr. A. R. Wallace in Sarawak. 



lY. LEPIDOPTEEA AS MIMICS. 



So much has been written, by abler pens than mine, on mimicry 

 amongst the Eastern Lepidoptera inter .se, that I have confined 

 myself to drawing up merely a table of such mimetic species as 

 occur in Borneo, with the addition of a few notes on the bionomics 

 of certain species. Three remarkable examples of lepidopterous 



