MEANS OF DEFENCE OF INSECTS. 405 
could not discover the slightest trace of any other insect or substance on 
which it could by possibility feed, but apparently passing a life of absolute 
solitude in the midst of these burning sands) had the most perfect identity 
of colour with that of the soil on which they were found, being brown where 
the soil was brown, and at not above a hundred paces distant of a silvery 
white, when found amongst the white particles of broken shells or calca- 
reous rocks of a similar dazzling colour. That it was the same species 
which exhibited this change of colour, M. Lefebyre did not doubt, nor 
that the object was its protection from its enemies, which it was so well 
calculated to effect that he could scarcely detect it by the closest inspec- 
tion; but he confesses himself unable to explain whether the different 
coloured Eremiaphile were confined to the soils of the same tints re- 
spectively, or, as in the case of the birds and quadrupeds which become 
white in winter in the Polar regions, they have the faculty of changing their 
colour as they change their abode.* 
Many insects, also, are like pebbles and stones, both rough and polished, 
and of various colours ; but since this resemblance sometimes results from 
their attitudes, I shall enlarge upon it under my second head: whether, 
however, it be merely passive, or combined with action, we may safely re- 
gard it as given to enable them to elude the vigilance of their enemies. 
A numerous host of our little animals escape from birds and other as- 
sailants by imitating the colour of the plants, or parts of them, which they 
inhabit; or the twigs of shrubs or trees, their foliage, flowers, and fruit. 
Many of the mottled moths, which take their station of diurnal repose on 
the north side of the trunks of trees, are with difficulty distinguished from 
the gray and green lichens that cover them. Of this kind are Miselia apri- 
lina and Acronycta Psi. The caterpillarof Bryophila Alge, when it feeds 
on the yellow Lichen juniperinus, is always yellow ; but when upon the 
gray Lichen sacatilis its hue becomes gray.” This change is probably pro- 
duced by the colour of its food. Leptocerus atratus, a kind of May-fly, 
frequents the black flower-spikes of the common sedge (Carew riparia), 
which fringes the banks of our rivers. I have often been unable to dis- 
tinguish it from them, and the birds probably often make the same mistake 
and pass it by. A jumping bug, very similar to one figured by Schellen- 
berg *, also much resembles the lichens of the oak on which I took it. 
The spectre tribe (Phasma) go still further in this mimicry, representing 
asmall branch with its spray. Ihave one from Brazil eight inches long, 
that, unless it was seen to move, could scarcely be conceived to be any 
thing else; the legs, as well as the head, having their little snags and 
knobs, so that no imitation can be more accurate. Perhaps this may be 
the species mentioned by Molina‘, which the natives of Chili call “ The 
Devil's Horse.” ® 
Other insects, of various tribes, represent the leaves of plants, living, 
decaying, and dead ; some in their colour, and some both in their colour 
and shape. The caterpillar of a moth (Hadena Ligustri) that feeds upon 
the privet is so exactly of the colour of the underside of the leaf, upon 
1 Ann. Soc, Ent. de France, iv. 455, 
: Pabr. Vorlesungen, 321. 5 Cimic. Helvet. t. iii. f. 3, 
* Hist. of Chili, i, 172. 
Since the first edition of this volume was printed, a lady from the West Indies, 
ooking at my cabinet, upon being shown this insect, exclaimed, “ Oh, that is The 
Devil's Horse!” 
Sd pos 
