September I. 2005 Odonatologica 34(3): 291-297 Odonata from the Ennedi and Ounianga regions of northern Chad, with a note of the status of Orthetrum kollmannspergeri Buchholz, and a checklist of species currently known from the Republic of Chad H.J. Dumont and D. Verschuren Limnology Group, Ghent University, Ledeganckstraat 35, B-9000 Ghent, Belgium Received May 25, 2004 / Updated and Accepted February 20, 2005 INTRODUCTION To date only three publications have dealt fully or in part with the Odonata of Chad (North-Central Africa); NAVAS (1936) reported 6 species from the Tibesti mountain range in the far North of the country; BUCHHOLZ (1959) reported 6 species from the Ennedi mountains in the desertic Northeast, and an additional 7 species from the sahelian Biltine region South and South-East of it; and dip- terologist C. DEJOUX (1968) provided a list of 31 taxa, of which 26 identified to species, from around N’Djamena and Lake Chad in the West (identifications by E.C.G. Pinhey). The scrub and wooded savannah regions in southern Chad remain unexplored. Hence, all new information on this huge (1.2 million km 2 ) country, which covers 16 degrees of latitude and the full North African ecotone from wet savannah in the South to absolute desert in the North, is most welcome. Also, although knowledge on the Odonata of the Sahara desert has greatly in- A hydrobiological survey of scarce permanent aquatic environments in the Ennedi and Ounianga regions of northern Chad yielded a small collection of 7 odon. spp. It adds 3 new spp. to the known fauna of Chad: Ischnura senegalensis, Pseudagrion hamoni, and Orthetrum sabina. The presence of O. sabina at Ounianga represents the westernmost record of this oriental sp. in N. Africa. Another oriental element, O. taeniolatum, may not exist in Africa W. of the Nile, possibly being replaced there by the closely related O. kollmannspergeri Buchholz. The 44 spp. hitherto reported from the Republic of Chad likely represent only a third or less of those to be expected in the country.