This taxon is Not Recognised as a species by BirdLife International.
Aerodramus leucophaeus (del Hoyo and Collar 2014) was previously placed in the genus Collocalia and split as C. leucophaea and C. ocista following Sibley and Monroe (1990, 1993).
BirdLife International (2016) Species factsheet: Collocalia ocista. Downloaded from http://www.birdlife.org on 04/12/2016. Recommended citation for factsheets for more than one species: BirdLife International (2016) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 04/12/2016.