(syn. Phylloscopus Ϯ Green-crowned Warbler P. burkii) Gr. σειω seiō to shake; κερκος kerkos tail; "Seicercus, from its fan-shaped tail, crested head, and lengthened feet, equally indicates the rasorial form. ... *Cryptolopha, Sw. (fig. 229.a) Bill short, triangular, resembling that of Lepturus. Rictus with lengthened bristles. Wings moderate; the first quill short, spurious, and only half as long as the second; the third shorter than the fourth. Tail moderate, rounded; the tips suddenly narrowed and mucronate. Tarsus lengthened, slender, nearly twice the length of the hind toe. Lateral scales entire. India only? C. auricapilla. Part 5. No. 186. ... *We propose substituting this name for Seicircus [sic], used in the former part of this volume, to avoid any confusion of this group with those of Seisura and Seiurus." (Swainson 1837). Var. Seicircus.