Matskási István (szerk.): A Magyar Természettudományi Múzeum évkönyve 98. (Budapest 2006)

Gattolliat, J.-L. ; Sartori, M.: The mayflies of Ghana (Insecta: Ephemeroptera)

four species known, only two, D. costale KlMMINS, 1957 and D. sjosterdti ULMER, 1910 (= D, marginatum KlMMINS, 1957 syn. fide PUTHZ 1972) are sufficiently known in the adult stage. Both of them have the subcostal field of the forewing tinted with brown, the latter also having some crossveins bordered with brown (KlMMINS 1957, PUTHZ 1972). D. fémorale is almost unknown in the winged stage. Some characters of the female subimago have been given by DEMOULIN (1954). The imagoes of both sexes are unknown. We provisionally assign our material to this species, based on the absence of a tinted subcostal field, as well as geographical data (see below). Distribution - D. femorale was described from Congo and since then has also been recorded from Ghana (DEMOULIN, 1970). Tricorythus latus ULMER, 1916 Material examined - GHANA: Northern Region, Banda-Nkwanta, 2°09'W, 8°22'N, 122 m, 1 C?, 01.09.1965 (G070), ENDRŐDY-YOUNGA, S. Diagnostic features - The single specimen available fits the description by ULMER (1916), as well as the redescription by DEMOULIN ( 1954). It differs from 77. lanceolatus KlMMINS, 1960 by the shape of the second segment of the forceps (KlMMINS 1960). Distribution - T. latus is known with certainty only from the Congo River at Kinshasa. ULMER (1916) mentioned the presence of the species in the source of the Nile River (Bahr-el-Djebel, Sudan), but KlMMINS (1960) hypothesized it could rather belong to T. lanceolatus. This species is new for Ghana. Tricorythus longus ULMER, 1916 Caenis regia NAVÀS, 1932 (syn.) Caenis collarti NAVÀS, 1933 (syn.) Material examined - GHANA: Northern Region, Banda-Nkwanta, 2°09'W, 8°22'N, 122 m, 4 C?d\ 01.09.1965 (G070), S. ENDRŐDY-YOUNGA. Diagnostic features - As for the previous species, these specimens are in accordance with the description by ULMER (1916) and DEMOULIN (1954). T. longus is related to T. tinctus KlMMINS, 1956, but differs in the coloration of the wing and in some details of the genitalia (KlMMINS 1956).