396 Dr. Leacn’s Arrangement of the Crustacea, &c. 
Gen. 1. TroĮmBIDIUM, Fabr., óc. 
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 lineá transversá haud impressum. 
Gen. 3. Eryturavs, Latr. 
Fam. II. GAMMASIDES. 
Os mandibulis instructum. Palpi porrecti simplices. 
Gen. 4. Gawnasvs, Lair. 
Fam. III. AcanriprEs. 
Os mandibulis instructum. Palpi simplices brevissimi haud por- 
recti. 
Gen. 5. ORIBITA, Latr. 
Corpus coriaceum. 
Gen. 6. Acarus, Linn., Latr. 
Corpus molle. > 
Fam. IV. IxoprDpEs. | 
Os rostro instructum. Oculi absconditi aut obscuri. ; 
Stirps 1. 
