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Southwestern France consists of 24 departments and covers an area of 128,000 km2. A list of 60 unquestionably valid spe cies of mayflies is provided for the region. The study area is the Terra typica of ten of the species : one described by Joly, two by Eaton, and seven by Thomas et al. Five species are endemic to the Pyrenees and are probably restricted to the north slope : Baetis catharus, B. nicolae, Rhithrogena kimminsi, R. strenua, and Habroleptoides berthelemyi. R. germanica, Ecdyonurus macani, and Ephemera vulgata are at risk because their hyporhithron and epipotamon habitats have been endangered by agri culture runoff, regulation, and diversion of the streams for irrigation, in particular when the water levels are already very low. For the same reasons, Isonychia ignota, Neoephemera maxima, Brachycercus harisella, and Ephemera glaucops have not been taken for over a century, and Prosopistoma foliaceum for more than 60 years, and all have presumably vanished from the re gion.

Ephéméroptères du Sud-Ouest de la France. V. Premier inventaire des espèces recensées depuis 1870 (Insecta, Ephemeroptera)