250 MR. R. SHELFORD ON MIMETIC INSECTS AND [ Nov. 4, 
In the Cerambycide, the antenne present great diversity of 
form—flabellate in Cyriopalus, thickened in “Epipedocera and 
Ephies, short in Demonax, Clytus, and many other genera, 
enormously elongate in Veoc erambys ceneas ; and we find, perhaps 
as a consequence of this plasticity of the antennal form, a close 
resemblance in structure and external appearance between the 
antenne of the mimetic Cerambycide and their models (e.¢., 
compare antenne of WVothopeus intermedius and Lphies dilati- 
cornis (Pasc.) with the antennz of Salius aurosericeus and the 
Lycid Metriorrhynchus kirschi (C. Waterh.) respectively) : whereas 
in the family Lamiide, nearly all the members of which are 
characterized by setaceous or linear antenne, the simulation of 
the differently constructed antennze of their models, if attained 
at all, is not brought about by actual resemblances in form, but 
by such devices as pilosities, modes of holding, or the thinning 
away of a portion of the length until it becomes almost aeneile 
im comparison with a specially thickened portion (compare the 
antenne of Alibora, Lgoprepis, &c., and of Xyaste invida with 
those of their respective models). 
Norves on Tasxe IL1.— Longicorns mimicking Longicorns. 
The only two subfamilies of the Longicornia which serve as 
models to the other subfamilies are the Callichromine, a group of 
metallie-green beetles protected by a powerful odour, which is 
produced by glands behind the ae sternum opening to the 
exterior by two pores, and the Clytine. This latter subfamily 
includes the well-known Clytus arietis (.), mentioned in many 
works on natural history as mimetic of a wasp. Whether this 
is a case of Miillerian or of Batesian mimicry can only be 
proved by experiment, but I am quite confident that the Bornean 
representatives of the group are all highly distasteful. The 
extremely conspicuous and strikingly coloured Chlorophorus 
(Clytanthus) annularis (Plate XX. fig. 31) was the commonest 
beetle on Mt. Penrissen at all elevations: some shrubs simply 
swarmed with it, while its movements and its very presence in 
such numbers spoke eloquently of some protective characteristic. 
Species of the genus Demonax were almost equally common on 
the mountain, whilst around Kue thing the species Clytanthus 
sumatrensis (Plate XX. fig. 37) and Demonax viverra (Plate XX. 
fig. 35) are amongst the commonest Longicorns met with. Such 
few experiments | as I have conducted have yielded negative 
results. During my collecting expedition to Mt. Penrissen I 
naturally had no tame animals with me, and therefore was unabie 
to experiment with Chlorophorus annularis, whilst in Kuching 
the species of Demonax and Clytanthus, though common enough, 
are never obtainable in large enough quantities at one time, a very 
necessary consideration when one experiments with that most in- 
quisitive of animals, the common Macaque (J/acacus cynomolgus), 
[22] 
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