Smicridea (Rhyacophylax) chicoana Flint 1983

Smicridea (Rhyacophylax) chicoana

This appears to be another species of the S. peruana group, but one that is quite distinct from the other known species. The elongate, narrow apices of the tenth tergites, the small, basolateral flap of the tenth tergum, and simple form of the aedeagus are all distinctive.

ADULT.—Length of forewing, 8 mm, 10 mm. Width of eye of male in dorsal aspect that of interocular distance. Color stramineous, thorax and head dorsally nearly black; forewing with a dark mark along chord, apical fourth grayish, with a dark spot in cell M; female with generally grayer ground color. Male abdomen with anterolateral process of fifth sternum length of sternum; without internal reticulate sacs.

Male Genitalia: Ninth segment with a broadly rounded anterolateral lobe; with anterolateral sclerotized bar strongly curved. Tenth tergum deeply divided apicomesally, with tergites elongate and tapering; lateral margin strongly sclerotized, especially basally, with a small, sclerotized lateral flap. Clasper with basal segment long and irregularly enlarged apicad; apical segment with pointed apex. Aedeagus enlarged basally, curved into axis of stem; internal sclerite long and slender.

MATERIAL.—Holotype (male): ARGENTINA, PCIA. SALTA, Chicoana, S Salta, 8–9 Oct 1968, L.E. Peña G., USNM Type 100530.

Paratypes: Same data as holotype, 31, 6; Peña Baya, Rt. 59, km 22.5, 16–17 Oct 1973, O.S. Flint, Jr., 2, 7; Cañada la Gotera, Rt. 59, km 23.5, 16–17 Oct 1973, 2; 20 km S Salta, 9 Oct 1968, L.E. Peña G., 1. PCIA. JUJUY, Dec 1911, P. Jörgensen, 2, 1 (ZSZM).