Type Material. Holotype, m#: BRAZIL: Mato Grosso do Sul, Rio Salobra ( 20 ° 41 ’ 35 ”S, 56 ° 44 ’ 26 ”W), 16– 21 /III/ 2004, O. Froehlich. Paratypes: 2 f#, same data as holotype, 10 f#, same data but 16–24 /VII/ 2004. 1 f#, Córrego Salobrinha ( 20 ° 40 ’ 58 ”S, 56 ° 46 ’ 40 ”W), 16-24 /VII/ 2004, O Froehlich. 1 f#, Córrego Salobrinha, IX/ 2003, K.O. Righi, M.R. Cavallaro and O. Froehlich.
Description. General colour light brown. Anterior frons pale to light brown, lappets brown; frons behind M-line ochraceous; genae brownish, darker anteriorly (Fig. 15). Parietalia brownish laterally, paler mesially. Antennae brown, palpi light brown to brown. Pronotum (Fig. 15) light brown with a broad pale median band. Femora yellowish basally and ventrally, brown dorso-distally. Tibiae and tarsi brownish, apex of tarsi darker. Wing membrane hyaline, veins brown, contrasting; C and distal Sc paler. Cerci yellowish to light brown basally, bicoloured distally.
Male. Forewing length, 8mm. Hammer (Fig. 16) a truncate cone, a little compressed, 0.1mm long. Penial armature (Figs. 18–19) relatively broad up to shoulders, narrowing abruptly to apical portion which, in dorsal view, has a crenate border subapically; ventrally there is a large vesicle. Dorsal keel V-shaped, diverging anteriorly, surface granular. Hooks bent at approximately right angles, surface of distal half irregular, basal part of distal half thick.
Female. Forewing length, 12.1–14.7mm, mean= 13.3mm (N= 14). Subgenital plate 4 -lobed, median lobes closer to each other than to lateral ones and separated by a deep rounded notch; lateral notches shallow. Behind median lobes, a slightly darker area (Fig. 17). Margin of sternum 9 broadly concave, slightly sclerotized; field of hairs forming a stubby and thick T.
Egg. Elongate, ca. 0.18 x 0.36mm (Fig. 18).
Remarks. This species is apparently not similar to any regional species, having unique penial armature and shape of the female subgenital plate, viz., its outline combined with the lightly sclerotized area of the median lobes.
Etymology. The epithet honours the Payaguá Indians that lived mainly on the river banks in the area and were also known as canoeiros for their use of boats. Noun in apposition.