Monticola solitarius -- Blue Rock Thrush; Blue Rock-Thrush. Alternate name on piece: Petrocossyphus cyanus. 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). Artist's name(s): Gould, John; Richter, Henry Constantine. Layout sketch, probably by Gould with tightening by Richter