ON NEW OR LlTTLE-KNOWN AC'AUI. 357 li). On some new or little-known Acari, mostly Parasitic in Habit. By Stanley Hirst, F.Z.S. (Submitted for Publication by permission of the Trustees of the British Museum.) [Received January 18, 1921 : Read April 5, 1921.] (Text-figures 1-15.) The present note deals with a miscellaneous series of Mites from various localities, including a number of new Gamasid mites found by Mr. James Waterston in the nasal cavities of Scottish birds, also several new ectoparasites from various sources. Demodex is recorded from several new hosts, viz., deer, long-eared bat, mole, and water-rat, three of the species being regarded as new. An interesting pseudoparasite of flies is also described, and a new English jumping-mite {Speleorchestes). Text-figures 1-7 were drawn by Mr. E. J. Engel Terzi, nos. 8-15 by Mr. Pei'cy Highley. Family Gamasid^. Rhinonyssus caledonicus, sp. n. (Text-fig. 1.) § . Abdomen nob elongated. Hairs on venter mostly only slightly thickened at the base, the posterior ones situated just in front of the anus are not dentiform, and there is only one pair in this position. Genito-ventral plate shorter and wider than in R. neglectus and R. vxdterstoni. Legs of moderate length, those of the first pair apparently sometimes longer than the others. Legs furnished with spinules, but they are minute. Claws of first leg with a distinct short process or denticle dorsally. Length •92-1-01 mm. Habitat. Nasal cavities of Uria grylle (Black Guillemot), North Mavine, Mainland, Shetland Islands: Gluss Yoe (25. ii. 1912), and Gluss Point (17. x. 1912), and Voe, Mainland, Shetland (2. iii. 1912). Specimens collected by James Waterston. Khinonyssus levinseni Tragardh. Sommatericola levinseni Tragardh, Monograph arktisch. Acar. in Romer and Schaudinn's Fauna Arctica, 1905, iv. pp. 28-30, text-figs. 42-47, also pi. i. figs. 1, 3, and 8. Tragardh'.s genus Sommatericola must, I think, be regarded as a synonym of Rhinonyssus Trouessart. His species Sommateri-cola = Rhinonyssus levinseni (from nasal cavities of Sommateria mollissima) seems from his description to be closely allied to R. scoticus, but he depicts more spinules round the anus than are present in that species, and also shows the lateral spines on the palp as much stronger than in R. water stoni.
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