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Lachlan is cosmopolitan although the distribution in the Neotropical biogeographical region appears to be restricted to Central America and the northern part of the South American continent. In total, about 175 species have been described, of which 38 are known from the Afrotropical biogeographical region (Morse 1999). A key to the African Triaenodes species was given by Kimmins (1962). Until now, ten species had been described or recorded from West Africa. In a preliminary check-list of the caddisflies of Ghana, Kjærandsen & Andersen (1997) listed 17 species of Triaenodes from the country, of which nine were assumed to be undescribed. Later an additional new species was found, resulting in a total of ten new species from Ghana alone. Our intent is to redescribe and figure all previously described Triaenodes species occurring in West Africa, including T. serratus Ulmer and T. elegantulus Ulmer not recorded previously from West Africa. In the present paper, we treat species assigned to the subgenus Triaenodella Mosely. In addition we describe a species, T. kwadwo sp. n., which does not fit readily into any subgenus. When erecting the genus Triaenodella Mosely for two East African species, T. cheliferus and T. clavatus, Mosely (1932a) stated that the genus was separated from Triaenodes mainly by the scent-organ apparatus in the male situated in the scape of each antenna. The scent organ takes the form of a tuft of specialized scent-hairs arising at the extreme base of the scape and is covered by a hinged flap. Triaenodella was subsequently treated as a subgenus of Triaenodes by Ross (1944), based on the presence, in Triaenodella, or absence, in Triaenodes sensu stricto, of a male antennal scape scent organ. The tribe Triaenodini was erected by Morse (1981) for the genera Adicella McLachlan, Allosetodes Banks, Erotesis McLachlan, Triaenodes McLachlan, and Ylodes Milne, based on two synapomorphies: mesopleural katepisternum constricted dorsally and male tenth tergites fused dorsally. Recently, Andersen & Holzenthal (1999) placed Allosetodes as a synonym of Triaenodes. According to Morse (1981), the genera assigned to Triaenodini arose from an ancestor in which the cubital vein in the hind wing lost its apical fork. Yang & Morse (1993) outlined the phylogeny of

West African Triaenodes McLachlan (Trichoptera: Leptoceridae). 1. Introduction and subgenus Triaenodella Mosely