Dr. Leacu’s Arrangement of the Crustacea, &c. 397 
Stirps 1. 
Rostrum et palpi ewserti. 
Gen. 6. Arcas, Latr. 
Gen. 7. Ixopes, Latr. 
The following species (five of which are new) were described 
from living specimens. 
Spec. 1. Ixodes plumbeus. 
Ix. scuto cordiformi, rostro cum vaginä pedibusque pallide ferru- 
. gineis, abdomine plumbeo. 
Long. Corp. 4 unc. 
Habitat in corpore et nido Hirundinis ripariz. ; 
Rostrum et vagina breves, pallidé ferruginee. Scutum parvum 
subrugulosum ferruginatum, cordiforme, margine antico anguste 
pallido. Coxe: pedumque articuli pallidi. 
Spec. 2. Ixodes hexagonus. 
Ix. scuto obscuré hexagono cum vaginá pedibusque ferrugineis ; 
abdomine testaceo-albido aut subplumbeo-pallido. 
Long. Corp. 5 lin. 
Habitat in Erinaceo europeo, gluteis tenaciter adherens. 
Rostrum pallidum. Vagina ferruginea, apice pallida. Cly- 
us fusco-ferrugineus utrinque triangulatim excavatus. Scutum 
saturate ferrugineum, punctatum, lineolis duabus utrinque im- 
pressis quae ultra medium paululum prodeunt. Pedes ferruginei, 
articulis apicibusque pallidis; coxa pallidiores. 
Spec. 3. odes ricinus. | 
Ix. scuto rotundo minore cum vaginà pedibusque fuscis, abdo- 
mine majore colore variante. 
Acarus ricinus. Linn., Fabr. 
Ixodes ricinus. Latr. 
3 F2 Long. 
