August 2005 – vol. 98, issue 8, pp 396–410 ABSTRACT The systematics and morphology of Common Chiffchaff Phylloscopus collybita of the Siberian subspecies tristis are much debated. Many putative tristis in Britain are distinctly pale and frequently attributed to `fulvescens', a form initially described by Severtzov in 1873 from a series collected in Central Asia. Treatment of the taxonomy and appearance of `fulvescens' is inconsistent. It is ... This article is only available to registered users.To read more, please log in or purchase a subscription.