ASTUR ALPHONSI NEWT. & GAD. _Astur sp._ Milne-Edwards, Ann. Sci. Nat. (5) XIX, Art. II, pp. 25, 26, pl. 15 fig. 2. (1874). _Astur alphonsi_ Newton and Gadow, Trans. Zool. Soc. XIII p. 285, pl. XXXIII, figs. 9, 10. (1893). Messrs. Newton and Gadow bestowed the name _Astur alphonsi_ on a pair of tibiae, a pair of metatarsals, and the metacarpals of the left side of a goshawk apparently of the same size and relative proportions as _A. melanoleucus_ of South Africa. They justified their description of this goshawk as a distinct species, first of all by the fact that most of the Mascarene extinct species were distinct; and then because the bony ridge for the _M. flexor digitorum communis_ was more strongly developed, the fibula reached further down the tibia, the peroneal crest was straighter and longer, and the cnemial crest slanted more gradually into the anterior inner edge of the shaft of the tibia. Milne-Edwards gives the measurements of the solitary tarso-metatarsus of this bird which he had for examination as follows:-- Total length 80 mm. Width at proximal extremity 11 " Width at distal extremity 13 " Width at smallest part of shaft 6 " Messrs. Gadow and Newton give the length of their tarso-metatarsi as 81 mm., of their tibiae as 117 mm., and of the metacarpals as 55 mm. Habitat: Mauritius. Seven tarsi in the Tring Museum. {85} HARPAGORNIS HAAST. Allied to _Aquila_, from which it is distinguished by the ulna being relatively shorter and the tarso-metatarsus stouter. HARPAGORNIS MOOREI HAAST. _Harpagornis moorei_ Haast, Trans. N.Z. Inst. IV, p. 192 (1872). Description of femur (from Haast): The cylindrical shaft bent forward, and above the distal extremity it is slightly curved back. The hollow on the top of the head is very large and measures .42 inch across. The trochanteric ridge is well developed and the outer side is very rough, showing that muscles of great strength and thickness must have been attached to it. The inter-muscular linear ridges are well raised above the shaft, of which the one extending from the fore and outer angle of the epitrochanteric articular surface to the outer condyle is the most prominent. The pits for the attachment of the ligaments in the inter-condyloid fossa are strongly marked. The femur is pneumatic, the proximal orifice is large and ear-shaped, resembling in form most closely that of the Australian Sea Eagle. Total length 6.66 inches. Circumference at proximal end 4.66 " Circumference at distal end 5.58 " Circumference at thinnest part of shaft 2.50 " Ungual phalanx (probably of left hallux): Length 2.92 inches. Circumference at articular end 3.17 "