Abstract. P. Delforge.- Description of Ophrys aeoli, Ophrys astypalaeica, and Ophrys thesei, three new Orchids of the Kyklades (Greece) [Natural. belges 78 (Orchid. 10) (1997): 153-176]. Research in the Kyklades, in 1994, 1995 and 1997 has permitted the delimitation of three new Ophrys species, one belonging to the O.  iricolor sub-group, and two to the O. bornmuelleri group. They are described here respectively as Ophrys astypalaeica, Ophrys aeoli, and O. thesei. The first seems endemic of Astypalaea, the second is presently known from Amorgos and Astypalaea, the last is found in Tinos and Naxos. A list of the localities of each species and 2 distribution maps are provided.

Key-Words: Flora of Greece, Kyklades, Amorgos, Astypalaea, Naxos, Tinos. Orchidaceae, genus Ophrys, Ophrys bornmuelleri group, Ophrys iricolor sub-group, Ophrys aeoli sp. nova, Ophrys astypalaeica sp. nova, Ophrys thesei sp. nova.