BIRDS OF THE BRITISH ISLES. 113 



and feet, pale brown. Length, about nine inches. The 

 adult female is brownish on the upper plumage ; buffish on 

 breast, shading into white on belly; flanks, tinged with 

 brown. 



THE Rock-Thrush (Monticola saxatilis, Linnaeus), which is 

 an exceedingly rare spring migrant to the British Islands, 

 is a summer visitant to certain portions of Central Europe 

 and Siberia. The adult male has the scapulars blackish, 

 tinged with blue ; middle of back, white ; head and neck, 

 slate-blue ; wing-feathers, brown ; upper tail-coverts and 

 tail, orange-chestnut; the two central tail-feathers darker; 

 throat, greyish-blue ; remainder of under parts, orange- 

 chestnut ; irides, hazel ; bill, black ; legs and feet, warm 

 brown. Length, about eight inches. The adult female 

 has mottlings of brown above and below ; throat, white, 

 mottled with brown ; tail, lighter than in the male. 



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