Aegithalos caudatus -- Long-tailed Bushtit. Alternate name on piece: Mecistura caudata [Long-tailed tit] Layout drawing, birds well advanced; 10 small individual sketches in margins; "Napoleon" (?); numerical calculations; "1/2 past 8." An earlier stage than Gould item 850. Artist's name(s): Gould, John; Richter, Henry Constantine.