HOLOSTASPIS.—PTEROPTUS. 39 
HOLOSTASPIS. 
Holostaspis, Kolenati, Wien. ent. Monatschr. ii. p. 87, t. 1. figg. 1, 2 (1858); Canestrini, Prospetto 
dell’ Acarofauna Italiana, p. 55 (1885). . 
1. Holostaspis marginatus. (Tab. XX. figg. 2, 2 a-e.) 
Acarus marginatus, Hermann, Mémoire Aptérologique, p. 76, t. 6. fig. 6. 
Holostaspis marginatus, var. americanus, Berlese, Bull. Soc. Ent. Ital. xx. p. 195. 
Hab. GuatemaLa, Retalhuleu (Stol/); Nicaracua, Chontales (Janson).—Sovru 
AMERICA, Brazil, La Plata, Paraguay. 
Two specimens of this classical Gamasus were collected by Mr. Janson at Chontales. 
I have frequently met with it at Retalhuleu, where its various larval and nymphal stages 
live as parasites on the common “ronron” or dung-beetle (Pinotus sp.), together with 
the nymphs and larve of Gamasus fucorum, De Geer (coleoptratorum, auct.). 
Subfam. DERMANYSSINA. 
PTEROPTUS. 
Pteropius, L. Dufour, Ann. Sciences Nat. xvi. p. 98 (1832). 
The bats of Central America are, as well as those of Europe, infested by parasitical 
mites of the genus Pteroptus, which attach themselves to the smooth skin of the 
wings and the axillary cavity. But as my drawings are too incomplete to allow the 
identification of the species, I do not reproduce them here, but merely state that this 
subfamily is represented in Guatemala. | 
Suborder II. ACARINA-ATRACHEATA, Kramer. 
[Kramer, Grundziige zur Systematik der Milben, in Arch. fiir Naturg. xlii. p. 218 (1877).] 
Fam. SARCOPTIDZ. 
[Michael, British Oribatide, p. 50 (1884).] 
Subfam. TV ROGLY PHINA. 
[Trouessart, Les Sarcopt. plumicoles, 1° part. p. 6 (1885).] 
In Guatemala I have occasionally observed the presence of free-living Tyroglyphi, as 
well as of hypopial forms attached to the body of several species of flies (Muscide), ‘but 
I have not taken exact notes as to any of them. 
