This taxon is Not Recognised as a species by BirdLife International.
Himantopus himantopus (del Hoyo and Collar 2014) was previously split as H. himantopus, H. leucocephalus and H. mexicanus and following AOU (1998) and SACC (2006). Prior to that, H. melanurus had been split from H. mexicanus following Sibley and Monroe (1990, 1993).
BirdLife International (2016) Species factsheet: Himantopus leucocephalus. Downloaded from http://www.birdlife.org on 05/12/2016. Recommended citation for factsheets for more than one species: BirdLife International (2016) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 05/12/2016.