Tawny-crested Tanager Chrysocorypha delatrii (Lafresnaye) is a poorly known passerine bird that ranges from Honduras to Ecuador. Howell (1957) suggested, but did not demonstrate, that body size decreases with latitude. To test this hypothesis, and to review the status of a poorly known subspecies, C. d. longirostris (Huber, 1929), I collected and analyzed measurements from a range-wide sample of study skins, including type specimens (n = 203). I also performed phylogenetic analysis on a small dataset of publicly archived DNA sequences. These data confirm the existence of a morphometric cline in C. delatrii, strengthen the case for treating the complex as a monotypic species, and highlight opportunities for future research.