Nectopsyche adusta Flint 1983

Nectopsyche adusta

In appearance this species is easily confused with the smaller, darker examples of N. muhni (Navás), but the male genitalia indicate that it is clearly a member of the N. quatuorguttata group.

The coloration is rather uniformly tawny, with the wings crossed by darker bands. In many specimens of N. muhni, the spots become larger and coalesce, forming bands across the wings; however, these bands are much more numerous, especially in the apical area in N. muhni. The male genitalia of N. muhni have the ninth segment higher and more erect, the apicomesal lobe of the clasper is borne distinctly below the apex of the clasper, and the basoventral margin of the clasper is much produced. The coloration alone separates this species readily from the other known species of the N. quatuorguttata group.

ADULT.—Length of forewing, 6–7 mm. Color tawny; antennae indistinctly banded basally, tawny apically; forewing uniformly tawny with fuscous, chevron-shaped, cross-bands. Eyes of male small; eye in ventral aspect about width of interocular distance.

Male Genitalia: Ninth segment in lateral aspect slightly shortened, distinctly prolonged posterodorsally, with virtually no dorsomesal lobe; dorsolateral arms short, slightly enlarged apicad. Tenth tergite with tip rounded. Clasper with basodorsal lobe long and slender, tip slightly enlarged; with ventral margin slightly produced basally and with several irregular processes, apicomesal lobe well developed, not surpassing tip of clasper; basoventral lobes broad, scooplike. Aedeagus with a large ventral plate and a small internal sclerite.

MATERIAL.—Holotype (male): ARGENTINA, PCIA. ENTRE RÍOS, Salto Grande, Río Uruguay, 16 Nov 1973, O.S. Flint, Jr., USNM Type 100546.

Paratypes: PCIA. CORRIENTES, Yapeyú, 17 Nov 1973, O.S. Flint, Jr., 1. PCIA. MISIONES, Arroyo Saura, 8 km N L.N. Alem, 20 Nov 1973, O.S. Flint, Jr., 7; Arroyo Coatí, 15 km E San José, 18–19 Nov 1973, O.S. Flint, Jr., 18; Río Iguazú, Camp Nañdu, 25 Nov 1973, O.S. Flint, Jr., 9.