23 



Their motions are extremely rapid, and are per- 

 formed by leaping. They abound in Europe, 

 under stones, in woods, on the ground, in damp 

 hedges, and on the shores of the sea and rivers: 

 they are generally small, and should be col- 

 lected in quills, and killed by exposure to heat: 

 when dead, they may be put on gummed paper. 



Order 2. ANOPLURA. Tail without setee or 

 filaments ; mouth in some furnished with two 

 teeth or (mandibles ?) and an opening beneath : 

 in others, with a very short tubulous haustel* 

 him. [PI. II, fig. 2.] 



This order contains those disgusting insects 

 known by the name of lice, the species of which 

 are far more numerous than is generally sup- 

 posed. Most quadrupeds, birds, fish, and even 

 insects, are annoyed by them ; and, in several 

 instances, many kinds have been found peculiar 

 to the species of bird from which it was taken: 

 to the Ornithologist, therefore, a knowledge 

 of this fact is frequently of importance, as the 

 parasite will often enable him to distinguish 

 varieties from species. Some birds are more 

 subject to these pests than others : they do not 

 attach themselves immediately to the skin, but 

 are generally secreted in the feathers, and 



