The lice of the deer, sheep, etc.

, have only one taral nail, and belong to the sub-genus TricJiodectes.

The next great family, LIOTIIKID.

E, is composed of species, many of which closely resemble the uuwinged forms of white ants and Psocus, having four-jointed, stout antennae with the tip joint thickened, a generally trilobate head, conspicuous max- illary palpi, either two-jointed or one-jointed tarsi, and correspondingly with two nails, or in Gyropus with only one nail.

These live upon falcons, pigeons, the stork, rook, magpie, and various wading birds, such as the heron, and egret.