This taxon is Not Recognised as a species by BirdLife International.
Serinus atrogularis and S. reichenowi (Sibley and Monroe 1990, 1993) are recognised as separate species, contra Dowsett and Forbes-Watson (1993). East African reichenowi is specifically distinct from Central African atrogularis (which it approaches or contacts in western Kenya) on account of: white vs grey forehead and supercilium (3); white chin, throat and breast vs marbled blackish-and-white throat and blackish breast (3); no broad white tips to inner vanes of rectrices (but also not present on some other forms of atrogularis); broader streaking on crown with whiter background, producing stronger pattern (2).
BirdLife International (2016) Species factsheet: Serinus atrogularis. 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.