Palinurus Tumidus sp. nov.

group of tree-lizards, whose colours and markings, for protective purposes, bear a strong resemblance to their natural surroundings. The bright green tints of one species enables it almost to defy detection amidst the evergreen foliage of the native shrubs; the marbled-brown skin of another is peculiarly adapted for concealment as it clings to the bark of a tree, or hides in the crevices; whilst a third, which inhabits the sulphur-crusted grounds in the Lake District, is of a uniform bright sulphur-yellow.

The species described by the author of this paper is beautifully marked on its upper surface with patches of pale brown and minute granulations of yellow, exactly resembling in appearance a peculiar Lichen common on the bark of certain trees. Apart from good specific characters, it furnishes another remarkable instance of the law of assimilative colouring referred to.