Also known as White-lored Euphonia, this is a male. Note the sides of the breast finely flecked with dusky, and the white chin looking like a milk mustache. Females are similar but have their underparts mostly grayish. Their overall drab appearance and preference for the canopy make them easy to overlook. This is the only one we saw. In fact we didn't recognize it at the time but only identified it later based on photos. Euphonias were formerly classified in the Tanager family, but have since been moved to the Finches (Fringillidae) based on recommendations by Zuccon et al. (2012). Canon PowerShot SX60 HS.
References:
Hilty, S. (2019). White-lored Euphonia (Euphonia chrysopasta). In: del Hoyo, J., Elliott, A., Sargatal, J., Christie, D.A. & de Juana, E. (eds.). Handbook of the Birds of the World Alive. Lynx Edicions, Barcelona. (retrieved from https://www.hbw.com/node/61798 on 4 August 2019).
Golden-bellied Euphonia (Euphonia chrysopasta), In Neotropical Birds Online (T. S. Schulenberg, Editor). Cornell Lab of Ornithology, Ithaca, NY, USA. retrieved from Neotropical Birds Online: https://neotropical.birds.cornell.edu/Species-Account/nb/species/gobeup1
Zuccon, Dario; Prys-Jones, Robert; Rasmussen, Pamela C.; Ericson, Per G.P. (2012). "The phylogenetic relationships and generic limits of finches (Fringillidae)" (PDF). Molecular Phylogenetics and Evolution. 62 (2): 581–596. doi:10.1016/j.ympev.2011.10.002. PMID 22023825.