Amaurospizopsis

(syn. Amaurospiza Ϯ Slate-blue Seedeater A. relicta) Genus Amaurospiza Cabanis, 1861, seedeater; Gr. οψις opsis  appearance; "AMAUROSPIZOPSIS genus novum.   Diagnosis. Very close to Amaurospiza Cabanis of the rain forests of southern Central America and obviously representing it, but a larger bird with a proportionately shorter and deeper stubbier bill; rictal bristles twice as long, greatly exceeding the plumules, and much stiffer; nostril large, with a marked operculum; culmen distinctly ridged, a groove just over the nasal fossae, extending forward two thirds of the way to the tip of the maxilla; maxilla with five other fainter ridges and grooves extending diagonally from the nostril to the commissure.   Type. Amaurospizopsis relictus.    AMAUROSPIZOPSIS RELICTUS spec. nov.  ...  The very rare and little known genus Amaurospiza belongs in a group of fringilline forms, which include the genera Oryzoborus, Cyanocompsa, Sporophila, Euethia, Volatinia, Passerina, and probably Melopyrrha, Loxipasser, and still other more slender billed forms. They differ from each other chiefly in size, proportions, and color pattern, and above all in the relative size and proportions of the bill.  ...  While, therefore, at first sight, Ridgway's key in the Birds of North and Middle America, Pt. I, does not disclose any striking and trenchant differences in structural characters, the very different distribution of these genera, the highly discontinuous or relict distribution of some of them, and the number of genera with representative species all occurring in one locality, are all factors which point to the relative antiquity and constancy of these generic characters." (Griscom 1934).

Search for more names on the Key to Scientific Names in Ornithology by James A. Jobling.
Recommended citation
Jobling, J. A. (2018). Key to Scientific Names in Ornithology. In: del Hoyo, J., Elliott, A., Sargatal, J., Christie, D.A. & de Juana, E. (eds.) (2018). Handbook of the Birds of the World Alive. Lynx Edicions, Barcelona. (retrieved from www.hbw.com on 11 December 2018).