REMARK
The genus is new to French Guiana.
Tomasovic (2002a) mentioned Efferia demifasciata (Macquart, 1850) and Efferia fuscanipennis (Macquart, 1850) as occurring in French Guiana. However, currently these species are allocated in Triorla Parks, 1968 and Nerax Hull, 1962, respectively (Papavero 2009). Thus, the two Efferia morphospecies collected at Mitaraka represent the first record of the genus from French Guiana (material examined: Efferia sp. 1 [Fig. 4K]: 1 ♂, 1♀, Mitaraka/008, MNHN; 1 ♂, Mitaraka/100, INPA; 1 ♂, Mitaraka/115, INPA; Efferia sp. 2 [Fig. 4L]: 1 ♂, Mitaraka/007, MNHN).