1. Elytra completely pubescent, pubescence on disc distinctly visible........ T. cinerascens (Klug)
— Elytra with apical and lateral pubescence, disc not pubescent, or if so pubescence not distinctly visible........................................................................................................................................ 2
2(1). Ventral surface yellow, if dark then legs pale yellow; elytra pale brownish yellow, with contrasting transverse dark mark on apical declivity of each elytron...................... T. schaumi (Harold)
— Ventral surface brown or dark brown, legs brown or yellowish brown; elytra brown, with or without obscure transverse mark on apical declivity of each elytron...................................... 3
3(2). Dorsal color predominantly reddish brown; elytral intervals alutaceous, shiny; body comparatively short, wide..................................................................................... T. calcaratus (Boheman)
— Dorsal color predominantly dark brown; elytral intervals alutaceous, dull; body comparatively elongate, narrow................................................................................. T. pulchellus (Müller)