1. Forewings infuscate over area surrounding venation (a). Marginal cell 1.55X as long as wide (a), venation thick with a very thin marginal vein (a); radial vein meeting wing margin at almost 90 degrees (a). Scutellar spine long, 0.8X length of the scutellum (excluding spine) (b). Notauli narrow (maximum width 0.35X the minimum distance separating notauli towards posterior mesoscutal margin) (b). Head subquadrate, 1.1X wider than long. First tergite (petiole) long (0.6X as long as high in lateral view; twice as long as nucha in dorsal view) (b) …Xyalophora tedjoansi

— Forewings hyaline (A). Marginal cell 2-2.5X as long as wide (A), venation thinner with less contrast in thickness with marginal vein (A); radial vein meets wing margin at acute angle (A). Scutellar spine shorter, 0.5X the length of the scutellum (excluding spine) (B). Notauli widened posteriorly (maximum width 0.7-0.8X the minimum distance separating notauli towards posterior mesoscutal margin) (B). Head distinctly (1.25X) wider than long. First tergite short (0.2 - 0.25X as long as high in lateral view; either a third of nucha length (B) or equivalent in length to nucha in dorsal view) ...2

2. Marginal cell 2.5X as long as wide (a). Nucha short, equivalent in length to first tergite (b). First tergite 0.25X as long as high in lateral view (B). Second flagellar segment longer than first. Median mesoscutal impression small (c) …Xyalophora provancheri

— Marginal cell twice as long as wide (A). Nucha long, 3X first tergite length (B). First tergite 0.2X as long as high in lateral view. Second flagellar segment as long as first. Median mesoscutal impression large, distinct (C) ...Xyalophora tintini