Four new species of Atrichopogon Kieffer, 1906 (Diptera, Ceratopogonidae) from Peruvian Amazonia and a key of Neotropical species of this genus with pigmented wings

Four new Neotropical species of the biting midge genus Atrichopogon Kieffer, 1906 (Ceratopogonidae, Forcipomyiinae) with distinctive pigmented wings are described, photographed and illustrated from males and females collected at light in the Department of Cuzco in southern Peru. Atrichopogon (Atrichopogon) tricuspis Rossi, Marino & Spinelli, n. sp. can be distinguished by the pair of bunches of setae in the posterior margin of the scutum, with a heavily sclerotized spermatheca in female and lacking of secondary sexual dimorphism in male; Atrichopogon (Atrichopogon) trochantispina Rossi, Marino & Spinelli, n. sp. presents the hind leg with a trochanter bearing black spines; Atrichopogon (Atrichopogon) soriai Rossi, Marino & Spinelli, n. sp. can be differed by the fore and midlegs brown and hind leg pale brown; Atrichopogon (Atrichopogon) delecollei Rossi, Marino & Spinelli, n. sp. presents the posterodorsal prong of aedeagal-parameral complex slender and notched apically. The new species are compared with their most similar Neotropical congeners and a key to the adult Atrichopogon with pigmented wings of the Neotropical region is provided.