Key to Barra species modified from Trýzna et al. 2022

1 Dorsal transverse carina of pronotum sub-basal to basal, close to posterior margin of pronotum, lateral carinae of pronotum well developed, protruding, reaching half of length of pronotum (figs 39–43, 45–47 [from Trýzna et al. 2022]), Nicaragua ............................................................. B. baruskae Trýzna, Caballero-Serrano & Carrasco 2022

- Dorsal transverse carina of pronotum almost antebasal (Figs 1, 3), distinctly distant from posterior margin of pronotum, lateral carinae of pronotum short, indistinct, barely reaching quarter of length of pronotum................................ 2

2 Dorsal transverse antebasal carina distinctly sinuous (figs 51, 54 [from Trýzna et al. 2022]), eyes smaller, dorsal ocular index 3.17 in male. Head, pronotum and elytra with dense dark ochre to bricky pubescence. Robust species, ratio of maximum length to maximum width of elytra 1.1 (Figs 51–55 [from Trýzna et al. 2022]) Brazil, Santa Catarina. B. salamandrina Frieser, 1983

- Dorsal transverse antebasal carina substraight (Fig. 1), eyes larger with a dorsal ocular index ca. 3 in males. Head, pronotum, and elytron with a different pattern....................................................................... 3

3 Distance between scrobe and eye short, at least ¼ of the eye length. Pronotum with a short lateral carina, not prominent and without vestigial extension, slightly convex, with presence of blunttubercle in the center (Fig. 3). Tibiae with an elongated dark spot before the apex, with dense whitish scales forming a ring pattern in the middle and at apical margin, erect at the apical margin, and with golden tone at tip (Figs 2–3). Head, pronotum, and elytra lacking sparse light-colored yellowish scales. Brazil, Tocantins ........................................................................ B. tocantinensis sp. nov.

- Distance between scrobe and eye moderately elongated, ⅓ shorter than the maximum diameter of the eye. Pronotum with widely curved and prominent lateral carina, extending past half of the pronotum in a vestigial manner, tubercle absent. Tibiae with elongated light annular spot before proximal half, not reaching middle of tibia. Head, pronotum, and elytra with sparse light-colored yellowish scales (figs 56–61 [from Trýzna et al. 2022]) Brazil (Bahia and Rio de Janeiro).................................................................................................. B. gounellei Jordan, 1904