From the Reise der österreichischen Fregatte Novara [...] Zoologischer Theil, A. Pelzeln, "Vögel":
"One specimen agrees with the description of the male given by Philippi and Landbeck, except that all tail feathers are without white, as is also the case with the individual in the British museum (Ibis 1864, 122). A female bird brought back from Novara may also belong to B. dispar" (p. 137).