it took a lot of wading through the paper to get to this bit:
Proposals considered but not accepted by the Committee included recognition of the columbid subfamily Starnoenadinae, change of the English name of Blue-headed Quail-Dove Starnoenas cyanocephala, separation of Garnet-throated Hummingbird Lamprolaima rhami into 2 species, recognition of Guanacaste Hummingbird Amazilia alfaroana as a species rather than a hybrid, separation of Ardea occidentalis from Great Blue Heron A. herodias, separation of Aegolius brooksi from Northern Saw-whet Owl A. acadicus, removal of “scrub” from the English names of the scrub-jays (Aphelocoma spp.), separation of Unicolored Jay Aphelocoma unicolor into 4 species, separation of Horned Lark Eremophila alpestris into 2 or more species, and change of the English name of Olive Warbler Peucedramus taeniatus to Ocotero.
Is the rational for these rejections published anywhere? I read the NACC proposals each year but never get to read the reasons for rejection or acceptance.