Chestnut-necklaced Partridge (Arborophila charltonii)

Sometimes placed in genus Tropicoperdix. Has been considered conspecific with A. chloropus, but differs in absence of buffy-tan band around lower throat/upper breast (3); presence of bold black necklace from lower throat to neck-sides (3); upper breast and sides of neck chestnut vs dingy grey-brown (3); lower breast more boldly barred (ns[2]); and remaining underparts a shade darker (ns[1]). Form graydoni here accorded full species status, since it differs in its plain dirty white vs plain tawny-buff ear-coverts (2); absence of a distinct black upper necklace from the lower throat around below the ear-coverts (2); much darker, richer chestnut on upper breast wih black vs greyish-brown lower breast feathers, more narrowly, evenly and distinctly barred with buff (3); belly with darker rufous and rufous-chestnut coloration (ns[1]), and darker upperparts (ns[1]). Validity of race atjenensis has been questioned#R. Two subspecies currently recognized.