Russel Wallace : Alfred Russell Wallace (sic)
This beautiful Hawk, which has been recently described by Dr. Schlegel (Muséum d'Histoire Nat. des Pays-Bas, "Astures," p. 24), presents us with another case of the island of Celebes possessing its own restricted species. The well-known Astur trivirgatus of Temminck ranges over Sumatra, Java, Borneo, the Philippine Islands, and, with but slight modification, over the whole of India and Ceylon; but the moment we pass over into Celebes, we find it represented by the allied yet perfectly distinct species now figured.
The specimens of Astur griseiceps in the Leyden Museum are from the northern part of the island, where I also found it. I likewise obtained one specimen of this species in the south, near Macassar. It seems, however, to be a rare bird, as the Leyden Museum contains only three specimens, obtained from Forsten, who collected for nearly two years in North Celebes; and I myself got the same number during about nine months' assiduous collecting in various parts of the island.