Elattoneura pluotae spec. nov. (Protoneuridae) et Mesocnemis dupuyi spec. nov. (Platycnemididae), zygoptères nouveaux du Sénégal

E. pluotae sp. n. is described and illustrated from specimens collected on a small stream near the Guinean border (holotype $: Dindefello, Kedougou, 31-V-I981; MNHN, Paris); it is referable to the pruinosa-group. — M. dupuyi sp. n. is also described from the Gambia Riv. (holotype allotype $: Gambia, radier de Samekouta, Kedougou, 2-VI-1981; MNHN, Paris), and it is briefly compared with M. robusta (Sel.) and M. singularis Karsch.