Drawing depicting: Monticola solitarius -- Blue Rock Thrush; Blue Rock-Thrush. Alternate name on piece: Petrocossyphus cyanus. [Blue rock-thrush], Layout sketch, probably by Gould with tightening by Richter, Sketchy use of watercolor to provide overall expression; buildings of North African appearance in background (consonant with native home of the bird, but not used in published plate).