Oecetis amazonica (Banks)

Fig. 1

Oecetina amazonica Banks 1924: 447 (male, original description); Fisher 1966: 109 (catalog); Flint 1967a: 22 (male lectotype); Flint 1972: 244 –5 (distribution); Flint 1982b: 49 (male, distribution); Paprocki et al. 2004 (distribution).

This species belongs to a group of closely related species, which includes O. inconspicua (Walker 1852), O. pseudoinconspicua Bueno-Soria (1981), O. excisa Ulmer (1907), and O. pseudoamazonica n. sp. (Figs 12 A–F). The phallic apparatus for this group is spherical with an acute, apical process. The genital structures of O. amazonica and O. pseudoamazonica n. sp. are very similar, and the differences are listed in the description of the new species. Oecetis amazonica can be distinguished from the other species by the presence of a well developed antecosta of segment IX not interrupted by the dorsal acrotergite of segment IX (which is positioned in this species distinctly behind the antecosta), the posteroventral margin of segment IX is rounded in ventral view, and the phallobase has its ventral process longer than in O. pseudoamazonica n. sp. The forewings of this species each have the crossveins r-m and m-cu almost in line, the coloration pattern is sharp and clear, and the length of each forewing is about 10 mm.

This species is recorded for the first time in Bolivia.

Material examined. BOLIVIA: Béni: Río Mocovi, 14°44'27''S, 64°54'24''W, (near Trinidad), 12.xi.2002, (CBF-UMSA) ― 5 females; Lake Belen, near Trinidad, 14°27'29''S, 64°51'41''W, 26.v.2003, (CBF-UMSA) ― 1 male; 03.iv.2003, (IML) ― 2 males, 2 females; Río Ibare, Puerto Ballivian, near Trinidad, 14°47'41''S, 64°58'21''W, 17.xi.2002, (CBF-UMSA) ― 2 males, 6 females; Lake Colorada, near Trinidad, 14°48'21''S, 64°58'41''W, 16.xi.2002, (CBF-UMSA) ― 4 males, 3 females; Arroyo near Reyes, 14°15'44''S, 67°26'52''W, 11.iii.2003, (CBF-UMSA) ― 2 males, 2 females; Lake Granja, Bella Vista, 13°15'50''S, 63°42'33''W, 06.v.2006, (IML) ― 1 male. Lake California, near Bella Vista, 10.v.2006, (CBF-UMSA) ― 1 male; Pando: Lake Bay, Río Manuripi basin, 03.viii.2007, (CBF-UMSA) ― 4 males, 5 females.

Distribution. Argentina, Brazil, Peru, Venezuela, Bolivia (new record).