Black-headed Bulbul (Pycnonotus atriceps) - HBW 10, p. 173

Taxonomy: Turdus atriceps Temminck, 1822, “Sandwich Islands”; error = Sumatra.
Genus as currently constituted probably polyphyletic; in-depth analysis of morphology, voice, behaviour and genetics required to redefine its limits. Present species previously placed in a separate genus Brachypodius; on basis of vocal, behavioural and morphological features, may merit return to this resurrected genus, alongside P. priocephalus and P. fuscoflavescens. Usually considered conspecific with last-mentioned, but considerable differences in plumage pattern and voice sufficient to warrant treatment as separate species. Forms described as P. chalcocephalus (Bantam district, in Java) and P. cinereoventris (Tippera district, in Bangladesh) shown to be variations of grey morph of present species, and “Brachypodius immaculatus” found to be a variant of the yellow type. Island races hyperemnus, baweanus and hodiernus poorly differentiated and in need of review. Proposed race major (NE India) was described on basis of inaccurate measurements and is invalid. Four subspecies provisionally recognized.