546 CLASS xvi. 



et A. H. VEBSTEB DE WULVEBHORST, Leiden et Dusseldorf, 18441853, 

 Avec 17 pi. color., par SONDERLAND et WOLF, folio. 



Sub-gen. jEsalon KAUP, Hypotriorchis BOIE. (Tarsi longer. Species small.) 



Sp. Falco subbuteo L., BUFF. PL enl. 432, NAUM. Taf. 26, SUSEM. Tog. 

 Eur. Taf. 10, fig. i ; the hobby, der LerchenfalTce, &c. 



Tinnunculus YIEILL., Cerchneis BOIE. Tarsi somewhat long, 

 covered anteriorly with a double row of scutes. (Toes shorter than 

 in the preceding.) 



Sp. Falco tinnunculuB L., BUFF. PI. enl. 401, 411, NAUM. Taf. 30, the 

 Icestril, la cresserelle; Falco cenchris NAUM. Taf. 29, etc.; species which 

 are of a red-brown colour above; the tail-feathers increasing in length 

 from without inwards, with darker transverse bands. Very similar is 

 Falco punctatus Cuv., TEMM. PI. col. 45, from Madagascar. 



leracidea GOULD (Hieraddea). 

 Sp. Falco berigora VIG. and HOBSF. 



H'ierax VIGORS. Upper mandible bidentate. Wings with second 

 and third quills subequal, longest of all. Tarsi scutellate anteriorly. 

 Toe long, strong. 



Sp. Falco cm*ukscens L., Falco mayalensis STBICKL., EDWARDS 2?i'refo,Tab. 108, 

 VIEILL. Gal., PL 18, TEMM. PL col. 97; Java, and a couple of species 

 from Asia; the smallest diurnal birds of prey. 



Harpagus VIGORS. (Bidens SPIX, Diodon LESS., Diplodon 

 NITZSCH.) Bill short, curved, thick, high; upper mandible biden- 

 tate. Wings somewhat short, with first quill short, second, third 

 and fourth gradually longer, fifth longest of all. Tail rounded, 

 elongate. Tarsi scutellate anteriorly. 



Sp. ffarpagus bidentatus, Falco bidentatus LATH., TEMM. PL col. 28, 288 ; 

 Harpogus diodon, Falco diodon TEMM. PL col. 198; both from Brasil. 



Circus LACEP., BECHST. Bill shorter than head, curved. Upper 

 mandible furnished with a tooth obtuse, obsolete. Cere covered by 

 setaceous, curved plumes. Dense feathers surrounding the lower 

 part of the face with a disc. Wings long, with third and fourth 

 quills longest of all. Tail long. Tarsi elongate, covered anteriorly 

 with transverse scutella. 



Sp. Circus rufus, Falco ceruginosus L., BUFF. PL enl. 460, 424, NAUM. Taf. 

 37, 38, fig. i, SUSEM. Vb'g. Eur. Tab. 36; the marsh-harrier, moor-buzzard, 

 la harpaye, le busard de marais, die Weihe, JRohr-oder Sumpf-weihe; 

 Europe, North Africa, some parts of Asia, &c. These species hunt on the 



