Abstract. Delforge, P.- Contribution to the knowledge of the Ophrys apparently intermediary between Ophrys fusca and Ophrys lutea in Sicily [Natural. belges 81 (Orchid. 13) (2000): 237-256 + 12 figs]. Until now, the Sicilian Pseudophrys systematics remains unclear, because of the usual complexity of that section, but also the difficulties to make connections between Sicilian and Tunisian taxa, and the presence, in Sicily and Tunisia, of numerous populations seeming intermediary between Ophrys fusca and O. lutea, traditionally considered as occasional hybrids. Only five taxa are generally accepted for Sicily: O. fusca, divided into a «large flowered» and a «small flowered» taxon, O. lutea, O. sicula (or O. lutea subsp. minor) and O. pallida. Since 1990, some advances have been made, with descriptions of new species unfortunately poorly documented (O. mirabilis, O. laurensis) or recognition of different taxa inside O. fusca s.l., sometimes already described from Sicily (O. obaesa Lojacono 1909), more frequently designated by provisional illegitimate names (e.g. O. “florentina-fusca”, O. “nigroaena-fusca”, O. “sabulosa-fusca”, O. caerulea, O. minor subsp. nigrescens) or old names refering to non-Sicilian species, and often doubtful (e.g. O. attaviria, O. bilunulata, O. funerea, O. galilaea, O. melena, O. murbeckii, O. subfusca). Research in March and April 2000 in Sicily and comparisons with material from the whole Mediterranean basin and more particularly from Tunisia, Malta, and Italian peninsula, have led to the recognition of fourteen species of Pseudophrys in Sicily, belonging to seven different species groups. 1. The O. fusca group (s. str.): three species, O. caesiella P. Delforge 2000, O. lucifera  J. Devillers-Terschuren & P. Devillers 2000, and O. lupercalis  J. Devillers-Terschuren & P. Devillers 1994 (= O. “nigroaena-fusca” nom. nud.) 2. The O. funerea group: one species, O. “florentina-fusca” nom. nud., a taxon until now heterogeneous, here better delimited. 3. The O. attaviria group: one species, O. “sabulosa-fusca” nom. nud., a large flowered, apparently Sicilian endemic. 4. The O. obaesa group: two species, O. obaesa Lojacono 1909 and O. pallida Rafinesque 1810. 5. The O. subfusca group, with four species, is the more diversified in Sicily but paradoxically the more overlooked, as in North Africa, because of a global similarity with occasional hybrids O. fusca ę O. lutea; it comprises O. laurensis Melki & Genier 1992, usually considered as a member of the O. fusca group, O. numida J. Devillers-Terschuren & P. Devillers 2000, described from Tunisia, and two new species here described, O. archimedea P. Delforge & M. Walravens 2000 and O. flammeola P. Delforge 2000, both apparently Sicilian endemics. 6. The O. lutea group: two species, O. lutea Cavanilles 1753, and O. sicula Tineo 1846. 7. The O. mirabilis group, monospecific: O. mirabilis Genier & Melki 1991.

Key-Words: Orchidaceae, genus Ophrys, sectio Pseudophrys, Ophrys fusca species group, Ophrys lucentina, Ophrys "(sabulosa-) fusca”, Ophrys "(florentina-) fusca”, Ophrys subfusca species group, Ophrys archimedea sp. nov., Ophrys flammeola sp. nov., Ophrys laurensis, Ophrys numida. Flora of Sicilia, Tunisia.