Fig. 4

Heads of Alpine Thrush Z. mollissima sensu stricto (top; Bhutan, late April, Yann Muzika), Himalayan Forest Thrush Z. salimalii, sp. nov. (middle; Baihualing, Yunnan, China, early February, Craig Brelsford) and Sichuan Forest Thrush Z. griseiceps (bottom; Chengdu, Sichuan, China, mid April, Xianwei Yang). Note differences in pattern of lores (least patterned in Alpine, most in Himalayan Forest); subocular/moustachial area (darkest in Himalayan Forest); auriculars (usually extensively pale-mottled throughout, with dark patch at rear in Alpine; variously pale-mottled in Himalayan Forest, mainly in lower rear corner, with indistinct or no dark patch at rear; usually rather uniformly, thinly pale-streaked in Sichuan Forest); colour contrast (Sichuan Forest) or lack of colour contrast (two others) between top of head and mantle; and colour of base of lower mandible (usually pale in Alpine, dark in others). Bill proportionately largest in Himalayan Forest and smallest in Alpine Thrush, but this Himalayan Forest has unusually small bill