Sub-fam. 6. _Falconinae._–The true Falcons are remarkable for a notched maxilla, while _Harpagus_ and the crested _Baza_, aberrant members of the group, and sometimes classed with the Kites, exhibit two "teeth." _B. lophotes_, of India, Ceylon, and the Malay countries, is greenish-black above, varied with white and chestnut on the wings; the fore-neck being white, and the breast shewing a band of black above one of chestnut, which is barred with buff towards the black vent. _B. verreauxi_, occurring from the Zambesi to Natal, is dark brownish-grey, with four black bars on the white-tipped tail, and rufous bands across the white breast and under wing-coverts; _B. cuculoïdes_, of West Africa, having the latter plain rufous. The somewhat similar _B. subcristata_ occupies North-East Australia, _B. rufa_ inhabits the Moluccas and Papuasia, _B. timorlaensis_ Timor-laut, _B. erythrothorax_ Celebes and the Sula Islands, _B. magnirostris_ the Philippines, _B. borneensis_ Borneo, _B. leucopais_ Paláwan, _B. sumatrensis_ Sumatra, Tenasserim, and Sikkim, _B. ceylonensis_ Ceylon and South-East India, _B. madagascariensis_ Madagascar, and _B. reinwardti_, with grey-barred breast, the Moluccas, Timor, and Papuasia. Comparatively little is known of the habits of these shy forest forms, which occasionally soar, feed upon the ground on chamaeleons, grasshoppers and other insects, build small nests, and lay about three whitish eggs with brown markings. _Harpagus diodon_, of British Guiana and Brazil, is grey, with brown wings and tail barred with whitish, white throat with a black streak, rufous thighs and under wing-coverts. _H. bidentatus_, extending from Panama to Brazil and Peru, has chestnut under parts, _H. fasciatus_ being hardly separable.