Rhopyscelis singuil (Nieto 2004) comb. n.

Varipes singuil Nieto 2004: 169; Domínguez et al. 2006: 188; Castillo & Pérez 2011: 348; Gutiérrez et al. 2013: 295.

Material examined. One nymph on slide (paratype), ARGENTINA, Escaba, State of Tucuman, Rio Singuil, 5.viii.1999, Molineri C. col. One nymph on slide (paratype), ARGENTINA , Salta, Dpto. Guachipas, Rio Grande de El Sauce, 15.ix.1998, Domínguez E., Molineri C. and Ubero cols, deposited at Museo Miguel Lillo – Argentina . Additional material not examined: Holotype (male nymph), Tucuman, ARGENTINA, river Medina, S26°32’27”. W65°01’45”, 860 m. 14.vi. 2001, Moiineri, Manzo, Orce & Nieto cols, deposited at Museo Miguel Lillo - Argentina .

Diagnosis. Male imago. The characters used in the generic section can also be used for specific identification.

Mature nymph. 1) antennae long, 1.5 × length of head capsule; 2) presence of medial decline on distal margin of labrum; 3) maxillae with palp 1.5 × length of galealacinia; 4) lingua with a small rounded apical projection (Fig. 35 in Nieto 2004); 5) glossa subcircular (Fig. 37 in Nieto 2004); 6) tarsal claws 0.36 × length of tarsi; 7) abdominal terga I and VIII dark brown.

Distribution. Argentina.