The present list contains data on type material of 109 mite species (Acaridida and Prostigmata) from Bulgaria (species, described by I. Vassilev, M. Kolebinova, P. Beron) and many foreign countries: Greece, Suriname, the Netherlands, New Guinea, Cuba, Mexico, Chile, USA, Canada, Madagascar, Gaboon, Liberia, Nigeria, Uganda, Mozambique, Tanzania, Zambia, Morocco, Tunisia, Malaysia, Burma, Thailand, China, and the Philippines (species, described by M. Kolebinova, P. Beron, F. Lukoschus, A. Fain, C. Welbourn, F. Dusbábek, K. Samšinák, K. R. Orwig, W. Atyeo and other authors). The type material housed in the National Museum of Natural History, Sofia includes species from the families Acaridae, Glycyphagidae, Canestriniidae, Proctophyllodidae, Trouessartiidae, Syringobiidae, Dermationidae, Ereynetidae, Cytoditidae, Myocoptidae, Chirodiscidae, Gastronyssidae, Myobiidae, Ophioptidae, Demodicidae, Smarididae, Erythraeidae, Neotrombidiidae, Eutrombidiidae, Trombiculidae, Leeuwenhoekiidae, Walchiidae, and Vatacaridae. All Bulgarian and foreign acarologists are kindly invited to submit type specimens under their care in the collections of the National Museum of Natural History in Sofia. This material will be properly housed and well used.