A new Syllimnophora with a key to the species from Ecuador (Diptera: Muscidae)

Syllimnophora Speiser belongs to the Limnophorini tribe of the Coenosiinae subfamily. The genus can be distinguished from the others by the presence of cilia on the apical half of the dorsal surface of vein R-1, combined with a strongly projected gena. In he Neotropical Region 28 species are known, three of them recorded from Ecuador - S. atrovittata (Stein), S. browni (Snyder) and S. suavis (Stein). The study of material from South America deposited at Museum national d'Histoire naturelle (Paris) enabled the description of one species new to science - S. argentifrontata sp. nov. from San Miguel de Ibarra (Ecuador). A key to the identification of the four species is given.