ORDER TRACHEARIiE. 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 Tromhidia hexapoda of Hermann. 



ACLYSIA, And., 



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. 



