Helicopsyche (Feropsyche) lambda Flint 1983

Helicopsyche lambda

In relation to the accompanying two Argentine species described herein, H. lambda has an expanded dorsal area of the clasper, the apical process of the clasper is displaced mesad, the basal area is intermediate in size, but the mesobasal lobe is produced and distinct in both lateral and posterior aspects.

ADULT.—Length of forewing, 4.5 mm. Color uniformly brown. Scape elongate, not specially modified. Sterna 3 and 4 reticulate, sternum 5 very indistinctly reticulate; sternum 6 with a posteromesal process about as long as sternum.

Male Genitalia: Ninth segment produced anterolaterally. Tenth tergum broad apically, apex trucate; with a basal V-shaped mark. Cercus an elongate lobe. Clasper broadened dorsally, dorsal margin curved, serrate, apex produced into a mesal point; mesobasal lobe barely produced posteriad in lateral aspect, in posteroventral aspect pointed apically, spinose, well defined. Aedeagus tubular, enlarged basally, membranous apically, with a small internal sclerite.

MATERIAL.—Holotype (male): ARGENTINA, PCIA. MISIONES, Arroyo Piray Mini, Rt. 17 W Dos Hermanas, 23 Nov 1973, O.S. Flint, Jr., USNM Type 100569.

Paratype: Arroyo Piray Guazú, N San Pedro, 22 Nov 1973, O.S. Flint, Jr., 1.