The White-rumped Snowfinch Montifringilla taczanowskii was formerly placed in the monotypic genus Onychostruthus Richmond, 1917 (e.g., Mayr 1927) as Onychostruthus taczanowskii, and this treatment, which receives support from phylogenetic analyses (Qu et al. 2006, Gebauer et al. 2006), and is adopted here, and now aligns with Gill and Wright (2006, IOC v.1.0).