Key to Ybytyramoan species

1 Antennifer process indistinct (Fig. 1); pronotum widest posteriad (Fig. 18), elytra almost 4x longer than wide (Fig. 16), abdominal sterna VI and VII with lanterns anteriorly rounded, straight posteriad, with posterolateral rounded projections (billycockshaped) (Fig. 19), phallum with anterior margin not indented in dorsal view, with median teeth laterally-oriented (Figs. 23–25)...................................................... Ybytyramoan praeclarum Silveira and Mermudes sp. nov.

1' Antennifer process conspicuous (Fig. 46); pronotum with lateral margins subparallel or slightly rounded (Figs. 28, 38); elytra more than 4x longer than wide (Figs. 26, 36); abdominal sterna VI and VII with lanterns somewhat rounded (Figs. 29, 39); phallum with anterior margin indented in dorsal view, median teeth dorsally-oriented (Figs. 33–35, 43–45).............. 2

2 Labrum strongly indented medially; pronotum slightly projected anteriad, yellowish-brown (Fig. 28); elytrum enlarging toward apex, widest at apical 1/5 (Fig. 26); lanterns as long as 3/4 sterna length (Fig. 29)....................................................................................... .. Ybytyramoan diasi Silveira and Mermudes sp. nov.

2' Labrum somewhat straight; pronotum somewhat rounded, light-yellow, disc sometimes pink (Fig. 38); elytrum widest medially (Fig. 36); lanterns almost as long as sterna (Fig. 39)........ Ybytyramoan monteirorum Silveira and Mermudes sp. nov.