ORDER TRACHEARI7E. 
509 
into the skin at the root of the hairs, and occasions itchings 
as insupportable as those produced by psora. In French it is 
called Rouget, and is in fact of a red colour, and is very small. 
The other species are found on different insects, and enter 
into the division of Trombidia hexapoda of Hermann. 
Aclysia, Aud ., 
Whose body has the form of a bag- pipe, with a siphon, with- 
out distinct palpi, situated underneath its anterior extremity, 
which is narrowed, curved and obtuse ; the feet are very 
small. 
The aclysise live on the bodies of the dytisci. At first but 
one species was discovered, A. dytisci , that after which, M. 
Victor Audouin established this subgenus. But M. Le 
Count de Manheim, a Russian naturalist, who has already 
well deserved of science, by his Entomological Essays, and 
his zeal in seconding the efforts of those who devote their at- 
tention to it, has discovered, as it would seem, another species. 
Atoma, Latr ., 
Have neither sucker nor palpi visible. Their mouth consists 
only of a small aperture situated in the breast. Their body 
is oval, soft, and the feet are very short. 
Ocypete, Lat ., 
Of Dr. Leach ; they belong to this tribe, from the number of 
their feet ; but, according to him, possess mandibles. 
