This species, which is sparingly dispersed over the whole of the southern part of Australia, is an equally beautiful representative of the common Kite, _Milvus regalis_ of Europe. Genus ELANUS, _Sav._ Species of this well-defined genus inhabit nearly every part of the world: two are natives of Australia. 23. Elanus axillaris Vol. I. Pl. 23. _Elanus melanopterus_, Vig. & Horsf. in Linn. Trans., vol. xv. p. 185. The _Elanus axillaris_ is a representative of the _Elanus melanopterus_ of Europe. 24. Elanus scriptus, _Gould_ Vol. I. Pl. 24. A fine new species rendered conspicuously different from all the other members of the genus by the black-lettered form of the markings under the wings. Captain Sturt found this bird abundant at the Depôt towards the interior of Australia. Genus LEPIDOGENYS, _J. E. Gray_. Of this genus three species are known; they inhabit India, the Indian Islands and Australia. 25. Lepidogenys subcristatus, _Gould_ Vol. I. Pl. 25. _Baza subcristata_, G. R. Gray, List of Birds in Brit. Mus. Coll., Part I. p. 19. 2nd edit. p. 41. _Pernis (Hyptiopus) subcristatus_, Kaup, Isis, 1847, p. 343. I have no additional information respecting this noble species; all the examples of which, that have come under my notice, have been obtained in the brushes of the east coast of Australia. Genus CIRCUS, _Lacep_. Two if not three kinds of Harriers inhabit Australia, consequently the number of species is nearly equal in Europe, Asia, Africa, America, and Australia; those inhabiting the latter country are precisely of the same form, and perform the same offices as their near allies do in the other parts of the world. 26. Circus assimilis, _Jard. & Selb._ Vol. I. Pl. 26. 27. Circus Jardinii, _Gould_ Vol. I. Pl. 27. _Circus (Spilocircus) Jardinii_, Kaup, Isis, 847, p. 102. Family STRIGIDÆ, _Leach_. Genus STRIX, _Linn_. While as a general rule other countries are only inhabited by a single species of the restricted genus _Strix_, the Fauna of Australia comprises no less than four, all of which appear to be necessary in order to prevent an inordinate increase of the smaller quadrupeds which there abound. 28. Strix castanops, _Gould_ Vol. I. Pl. 28. 29. Strix personata, _Vig._ Vol. I. Pl. 29. 30. Strix tenebricosus, _Gould_ Vol. I. Pl. 30. 31. Strix delicatulus, _Gould_ Vol. I. Pl. 31. _Strix flammea?_ Vig. & Horsf. in Linn. Trans., vol. xv. p. 190. Genus ATHENE, _Boie_.