RESEMBLANCES AMONG ANIMALS. 57 



concentricus) is found only at Para, on a distinct 

 species of tree, the bark of which it resembles with 

 equal accuracy. Both these insects are abundant, and 

 we may fairly conclude that the protection they derive 

 from this strange concealment is at least one of the 

 causes that enable the race to flourish. 



Many of the species of Cicindela, or tiger beetle, 

 will illustrate this mode of protection. Our common 

 Cicindela campestris frequents grassy banks, and is 

 of a beautiful green colour, while C. maritima, which 

 is found only on sandy sea- shores, is of a pale bronzy 

 yellow, so as to be almost invisible. A great number 

 of the species found by myself in the Malay islands 

 are similarly protected. The beautiful Cicindela glo- 

 riosa, of a very deep velvety green colour, was only 

 taken upon wet mossy stones in the bed of a moun- 

 tain stream, where it was with the greatest difficulty 

 detected. A large brown species (C. heros) was found 

 chiefly on dead leaves in forest paths ; and one which 

 was never seen except on the wet mud of salt marshes 

 was of a glossy olive so exactly the colour of the mud 

 as only to be distinguished when the sun shone, by its 

 shadow! Where the sandy beach was coralline and 

 nearly white, I found a very pale Cicindela ; wherever 

 it was volcanic and black, a dark species of the same 

 genus was sure to be met with. 



There are in the East small beetles of the family 

 Buprestido3 which generally r3st on the midrib of a 

 leaf, and the naturalist often hesitates before picking 

 them off, so closely do they resemble pieces of bird's 



