Oecetis excisa Ulmer

Fig. 6

Oecetis excisa Ulmer 1907: 15 (male, female, original description); Flint 1982b: 50 (male, distribution); Paprocki et al. 2004 (distribution).

Oecetis mutila Navás 1918: 22 (male); Schmid 1949: 382 (to synonymy)

Oecetis castilleja Navás 1920a: 134 (female); Schmid 1949: 382 (possible synonym of O. excisa); Flint 1972: 244 (to synonymy).

Oecetis muhnia Navás 1920b: 28 (male); Flint 1972: 244 (to synonymy).

Oecetis apicata Navás 1931: 323 (female); Flint 1982b: 50 (to synonymy).

Oecetis excisa is common and widespread in the Neotropical Region. This species was synonymized with O. apicata Navás (1931) by Flint (1982b). In this same work, he stated, “it may be shown that O. excisa is a synonym of O. inconspicua (Walker 1852) .” We collected specimens of O. excisa and O. inconspicua and were able to distinguish the 2 species based on differences in the inferior appendages, tergum X, and wing venation. The genitalia of the 2 species are easily distinguished by the shape of the dorsal process of each inferior appendage (in lateral view), which is longer and thinner in O. excisa compared to O. inconspicua (Figs 6 B, 7B). In dorsal view, tergum X of O. excisa is broad basally and abruptly narrowed distally (Fig. 6 C), whereas tergum X of O. inconspicua is slightly narrowed and rounded distally (Fig. 7 C). Finally, R2+3 is forked just before the terminus of R 1 in the hind wings of O. excisa, but it is unforked in O. inconspicua .

Material examined. ARGENTINA: Salta: Parque Nacional Calilegua, AºYuto, 23º38´40"S, 64º35´53"W, 7.xi.2006, C. Molineri et al. cols., (IML) ― 1 male; Córdoba: Dique Los Molinos, Feb. 1955, A Willink, (NMNH) ― 1 male. BRAZIL: Corias St., Lago Feia, near Formosa, 25.iv.1972, (NMNH) ― 1 male. MEXICO: Linares, Río Camacho, 21–22.vi.1965, (NMNH) ― 1 male. PARAGUAY: Río Aquiblaban, Cerro Cora, 2.ii.1973, O. S. Flint col., (NMNH) ― 1 male. VENEZUELA: Base Camp, 0°51´N, 66°10´W, (NMNH) ― 1 male.

Distribution. Argentina, Bolivia, Brazil, Mexico, Paraguay, Venezuela.