Abstract. P. Delforge.- The Ophrys of the Gers, Ophrys aegirtica, an unrecognized species of the French flora [Natural. belges 77 (Orchid. 9) (1996): 191-217]. Research in the South-West of France, departments of Gers (32) and Hautes‑PyrŽnŽes (65) in June 1981, 1995, and 1996 has revealed 20 sites of an Ophrys usually determined as O. fuciflora but distinguished by a later flowering period as well as floral dimensions and structural characteristics. Not yet published information gives also 10, and perhaps 11 sites in the border department of Haute‑Garonne (31). O. fuciflora seems to be lacking in that area. Pseudocopulations by a specific pollinator, the solitary bee Eucera hispana, have been observed. All this facts prove the specific status of this taxon. A differential diagnose is made. Nomenclatural solutions are envisaged but Ophrys truncata Dulac is a nomen illegitimum and Ophrys ×vicina Duffort is not suitable to name that taxon. Consequently, it is described here as Ophrys aegirtica sp. nova. Uncertainties of the systematics of Eucera hispana are mentioned. A new interpretation of the parents of two interspecific hybrids described by Duffort is made. A list and a map of the 30 or 31 actually known localities of Ophrys aegirtica are provided.

Key-words: Flora of France, departments of Gers, Haute-Garonne, Hautes‑PyrŽnŽes; Orchidaceae, genus Ophrys, Ophrys fuciflora complex, Ophrys tetraloniae group, Ophrys aegirtica sp. nova, Ophrys truncata, Ophrys ×insidiosa, Ophrys ×vicina; Hymenoptera, Anthophoridae, Apoideae, genus Eucera, Eucera hispana, pseudocopulation.