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Two new mite species of the subfamily Harpirhynchinae Dubinin, 1957 (Acariformes: Harpirhynchidae) are described from passerine birds (Aves: Passeriformes): Harpirhynchoides artamus n. sp. from Artamus fuscus Vieillot (Artamidae) from an unknown locality in South Asia and Neharpyrhynchus domrowi n. sp. from three host species of the family Meliphagidae, Acanthorhynchus tenuirostris (Latham) (type-host) from Australia (New South Walles), Ptiloprora perstriata (De Vis) and Myzomela rosenbergii Schlegel from Papua New Guinea.

The zumpti species group of the genus Harpyrhynchoides (Harpirhynchidae), parasites of passerines, is revised. A key to the species of this group is provided and data on host associations and geographic distribution of its constituent species are summarized. This group includes six previously recognized species: Harpyrhynchoides alaudinus Bochkov, 2000, H. brevis (Ewing, 1911) comb. nov., H. heatherae Bochkov and Galloway, 2013, H. rubeculinus (Cherny and Sixl, 1971), H. vulgaris Bochkov and Galloway, 2004, and H. zumpti (Fain, 1972). Three species from North American passerines are described as new: H. setophaga sp. nov. from Setophaga ruticilla (Parulidae), H. xanthocephalus sp. nov. from Xanthocephalus xanthocephalus (Icteridae), and H. spizella sp. nov. from Spizella passerina (Emberizidae). Additionally, H. brevis is redescribed based on samples from Coccothraustes vespertinus (type host) and Loxia curvirostra (Passeriformes: Fringillidae) from North America. Harpyrhynchoides kirgizorum Fain et al. 1999 syn. nov. is synonymized with H. zumpti.

The subfamily Harpypalpinae Fain, 1972 (Acariformes: Cheyletoidea: Harpirhynchidae) is revised. Diagnoses of the subfamily and its two constituent genera, Harpypalpus Dubinin, 1957 and Harpypalpoides Lombert and Moss, 1979, and keys to females of all known species are provided. Data on harpypalpine hosts and distribution are summarized, and nine new species are described: Harpypalpus lonchura sp. nov. from Lonchura castaneothorax (Gould) (Estrildidae) in Australia, Harpypalpus pyrrhula sp. nov. from Pyrrhula pyrrhula (Linnaeus) (Fringillidae) in the Netherlands, Harpypalpus sturnus sp. nov. from Sturnus vulgaris Linnaeus (Sturnidae) in the Netherlands, Harpypalpus taeniopygia sp. nov. from Taeniopygia guttata (Vieillot) (Estrildidae) in Australia, Harpypalpoides hirundinoides sp. nov. from Hirundo rustica Linnaeus (Hirundinidae) in the Netherlands, Harpypalpoides johnstoni sp. nov. from Fringilla coelebs Linnaeus (Fringillidae) (type host) in the Netherlands and Fringilla montifringilla Linnaeus in Kazakhstan, Harpypalpoides regulus sp. nov. from Regulus regulus (Linnaeus) (Regulidae) in the Netherlands, Harpypalpoides sitta sp. nov. from Sitta pygmaea Vigors (Sittidae) in the USA (Arizona, California), and Harpypalpoides sylvia sp. nov. from Sylvia atricapilla (Linnaeus) (Sylviidae) in the Netherlands.

The subfamily Onychalginae Fain, 1988 (Acariformes: Pyroglyphidae) is a monophyletic lineage comprising the closest parasitic relatives of the free-living pyroglyphid house dust mites. Onychalgine mites parasitize passerine birds of the families Estrildidae, Passeridae, and Ploceidae in Africa and South America (a single record of Onychalges spinitarsis from a piciform bird requires confirmation). We revise this subfamily based on external morphology of adults and immature stages using light and scanning electron microscopy and give a key to species. Onychalginae includes 2 genera: Onychalges Gaud and Mouchet, 1959 (6 species) and Paramealia Gaud, 1968 (1 species). The genus Kivuicola Fain, 1971 syn. nov. is synonymized with Onychalges, and its single species K. kivuana Fain, 1971 syn. nov. is considered as a putative synonym of O. odonturus Gaud, 1968. Onychalges spinitarsis (Fain and Gaud, 1984) is considered as a species inquirenda.

Four new syringophilid species of Syringophiloidus Kethley, 1970 are described from North American passerines: S. zonotrichia n. sp. from Zonotrichia albicolis (Gmelin) (Emberizidae) on Texas; S. jackowiaki n. sp. from Poecile carolinensis (Auduborn) (Paridae) in Texas; and S. xanthocephalus n. sp. from Xanthocephalus xanthocephalus (Bonaparte) (Icteridae) and S. agelaius n. sp. from Agelaius phoeniceus Linnaeus (Icteridae), both from Arizona. Spizella breweri (Cassin) (Emberizidae) from California is a new host for Syringophiloidus sialius Skoracki, Flannery & Spicer, 2009; and Melospiza lincolnii (Auduborn) (Emberizidae) from Texas and Vermivora ruficapilla (Wilson) (Parulidae) from California are new hosts for S. seiuri (Ckark, 1964). S. daberti Bochkov, Fain & Skoracki, 2004 from Passerina ciris Linnaeus (Cardinalidae) is recorded in the USA for the first time. A table with the host associations and distribution of all of the North American species of Syringophiloidus is given.

Five new quill mite species of the genus Torotrogla Kethley, 1970 (Acari: Syringophilidae) are described from North American passerines: T. aphelocoma sp.n. from Aphelocoma californica (Corvidae) and T. cardinalis sp.n. from Cardinalis cardinalis (Cardinalidae) in Texas; and T. coccothraustes sp.n. from Coccothraustes vespertinus (Fringillidae), T. cyanocitta sp.n. from Cyanocitta stelleri (Corvidae), and T. piranga sp.n. from Piranga ludoviciana (Thraupidae) in California. A key to females of all known Torotrogla spp. and a table with their host associations and distributions are given.