Anacroneuria genualis (Navás) comb. nov. (Fig. 1)

Neoperla genualis Navás 1932 . Rev. R. Acad. Cien. 29: 58.

Material Examined. Holotype: m# [according to Navás], but now lacking the abdomen. Labels: Matto Grosso S. Martinho XI. 29 W. Melzer/Melzer ded/ Holotypus / Neoperla genualis Nav. P. Navás S.J. det./ Typus / Dtsch. Ent. Inst. Berlin/Dtsch. Ent. Inst. Eberswalde/ N. genualis Nav.

Redescription. General colour pale yellowish, with no darker pattern, as described by Navás (1932). Head and pronotum pale (Fig. 1), ocelli relatively large with black rings. Forewing length, 11.7 mm; wing membrane unpigmented, veins pale ochraceous to almost colourless. Legs pale yellowish with black knees. Body and legs relatively hairy.

Remarks. Uniformly pale species of Anacroneuria are not common, unless freshly moulted. Anacroneuria lepida Klapálek 1923, from Chapada dos Guimarães, Mato Grosso, is also a pale species and, as A. genualis, lacks the abdomen; the type is kept in the Museum of Natural History, London. Both should be considered species inquirenda.