578 CLASS IX. 
This family unites some characters of the third family with others 
of the fifth. The larve, or the imperfect young animals, have 
only six feet. Here belongs the genus Caris of Larremn, which 
contains mites that live on bats, probably young individuals of 
Dermanyssus. 
Uropoda LAtr. Body depressed, with dorsal shield orbicular. 
Peduncle deciduous, infundibuliform at the posterior part, serving for 
fixing the body. 
Sp. Uropoda vegetans, Mitte végétative Du Gurr Mém. vit. Pl. 7, figs. 15—19 ; 
Koc in Hurricu-ScuaFrrer Deutschl. Ins. Heft 188, Tab. tg ; GUGRIN 
Iconogr., Arachn. Pl. v. fig. 10; parasitic on beetles. GERVAIS mentions 
some other species, Aptéres, III. p. 221. 
Pteroptus Liiox-Durour, Celeripes Montacu, Spinturnia V. 
Heypen. Body depressed. Palps with last jomt longer, oval. 
Feet thick, with joints short. 
Sp. Pteroptus vespertilionis, HERMANN Mém. Aptér. Pl. 1, fig. 14, Koon in 
HERRICH-SCHEHFFER Deutschl. Ins. Heft 167, Tab. 23, parasitic on Vesper- 
tilio noctula ; the same or a nearly allied species occurs on Vesp. serotinus. 
See on other species Koc 1. 1. Heft 137 and 188, who joins this and the 
preceding genus to the Sarcoptides (our Acarea). 
Argas Latr. Rostrum inferior, concealed under the margin of 
body produced. First joint of palps longer than the rest. Feet 
approximate at the insertion, biunguiculate, with caruncle none or 
indistinct. i 
Sp. Argas reflecus LATREILLE, Argus reflexus FaBr., Rhynchoprion columbe 
Herm. Mém. Apt. P1.'4, figs. 10, 11, Kocu in HerricH-ScH£FFER Deutschl. 
Ins. Heft 189, Tab. 1 ; found in France, Italy, &c. on pigeons. A species 
occurring in Persia, lives in houses, and by its puncture occasions in man 
convulsions, delirium, and sometimes, as is asserted, even death: Argus 
persicus FISCHER, GERVAIS A ptéres, III. pp. 229—231, Pl. 33, fig. 6. 
Holothyrus GERV. 
Consult GERVAIS Aptéres, 111. pp. 233. Is this its place ? 
Dermanyssus Ducks. Last joint of palps very small; labrum 
acute; mandibles in males chelate, with outer finger very long, in 
females ensiform. Body soft. Anterior feet elongate ; last joint of 
feet furnished with caruncle bilobed and two claws. 
