49. Acanthylis caudacuta[Vol. II. ] Pl. 10.

A migratory bird in most parts of Australia, but whence it comes or whither it goes has not yet been ascertained; of its nidification also nothing is known.

I have alluded to the great wing-powers of the birds of the genus Acanthylis, and in confirmation of which I may mention that an individual of this species was killed in England during the past year: it would be interesting to know the route pursued by the bird in travelling so great a distance as it must have done.

Genus Cypselus, Ill.

Of this genus, as of Acanthylis, there is but one species peculiar to Australia: other members of the group inhabit the continents of Europe, Asia and Africa, but not America.

50. Cypselus Australis, Gould[Vol. II. ] Pl. 11.

Genus Atticora, Boie.

The members of this genus are principally American.

I am not fully satisfied of the propriety of placing the bird I described in the ‘Proceedings of the Zoological Society’ as Hirundo leucosternon in the present genus: if on a further knowledge of the Australian birds it should prove that I have been correct in so doing, the species will be found to inhabit Australia, Africa and America.