Anacroneuria melzeri (Navás) comb. nov. (Figs. 2–3)

Neoperla melzeri Navás 1932 . Rev. R. Acad. Cien. 29: 59.

Material Examined. Holotype, f#, with the labels: Matto Grosso S. Martinho XI. 29 W. Melzer/Melzer ded/ Holotypus / Neoperla melzeri Nav. P. Navás S.J. det./ Typus / Jun 68 Froehlich/ Dtsch. Ent. Inst. Berlin/Dtsch. Ent. Inst. Eberswalde/ N. melzeri Nav.

Redescription. Frons mostly brown, a lighter area in the middle and at sides of ocelli; parietalia also lighter (Fig. 2). Scape of antennae (remaining segments missing) and palpi brown. Pronotum uniformly brown. Legs brown, femora more yellowish basally. Wing membrane lightly infuscated, veins brown, C and Sc distally lighter. Forewing length, 11.4 mm. Subgenital plate 4-lobed, mesal lobes low, broader than the lateral lobes; median notch deeper than lateral ones (Fig. 3). Sternum 9 with a T-shaped field of hairs.

Remarks. Navás (1932) describes the pronotum as having a slightly lighter middorsal stripe, no longer visible in the holotype. The species can apparently be recognized by the mostly brown frons with a central light spot and the brown pronotum, in combination with the shape of the female subgenital plate (Fig. 3).