396 Dr. Leach's Arrangement of the Crustacea, ^c. 
Gen. 1. Trombidium, Fair., ^c. 
Pedes octo. 
Gen. 2. OcYPETE. 
Pedes sex. 
Spec. 1. Ocypete rubra. 
O. corpore rubro, dorso pilis longis raris pedibusque pilis brevi- 
bus plurimis rufo-cinerascentibus obtectis, oculis nigro-fuscis. 
Habitat in Tipularidibus frequentissime. 
I have taken no less than sixteen specimens of this animal from 
one gnat. 
Stirps 2. 
Oculi sessiles. Corpus lined transversd baud impressum. 
Gen. 3. Erythra^us, Latr. 
Earn. II. Ga MMASIDES. 
Os mandibulis instructum. Palpi porrecti simplices. 
Gen. 4. Gammasus, Latr. 
Earn, III. Acarides. 
Os mandibulis instructum. Palpi simplices brevissimi baud por- 
recti. 
Gen. 5. Oribita, Latr. 
Corpus coriaceuin. 
Gen. 6. Acarus, Linn., Latr. 
Corpus molle. 
Earn. IV. Ixodides. 
Os rostro instructum. Oculi absconditi aut obscuri. 
Stirps 1. 
