74 FALCON ID Ji. 



same time it is a Marsh-Harrier, wliile Professor Newton allies his 

 species to the Hen-Harrier. 



17. MICRASTUR. 



Brachypterus, Less. Compl. Buff. vii. p. 113 (1836, Type. 



nee Kiiffel) M. semitorquatus. 



Cariiife.\,'im. Hev. Zool. 1842, p. 378 (nee Sun- 



^^j, \ M. semitorquatus. 



Micrastur, " Gray, List Gen. B. p. 6 (1841) M. semitorquatus. 



Climacocercus, Cuh. in Tschudi, Faun. Peruan. 



Voff. p. 98 (184-3) •^■_- • M. gilvicoUis. 



Eh-^Tiehomegus, Bp. Bev. et Mag. de Zool. 1854, 



p_ 537 M. semitorquatus. 



Cf. Sel. i<f Salv. P. Z. S. 1869, p. 364. 



Bill of Micrastur. 



Range. From Southern Mexico throughout the -n-hole of Columbia, 

 Amazonia, Guiana, and Brazil, extending into Bolivia and Peru on 

 the western side of the continent and to Kio on the eastern coast. 



Key to the Sjjecies. 



a. Larger : imdemeath entirely uniform, not 



barred. 

 a'. With a white or creamy-buff collar round 



hind neck semitorquatus, p. 75. 



h'. With no collar mirandollei, p. 76. 



b. Smaller : underneath barred in a most regu- 



lar manner. 

 c'. Flanks white, barred with gi-eyish black, 

 c". Above uniform slate-colour, brown, or 

 blackish grey. 

 c'". Fore neck more or less tinged with 



orange-rufous rvjicollis c? , p. 76. 



d'". Fore neck barred with white and 

 black, 

 c"". Lower abdomen and vent white . . gilvicoUis S 2 ; V- ^^• 

 d"". Lower abdomen and vent di- 

 stinctly barred like rest cf un- 

 der surface guerilla J , p. 79. 



d". Back rufous or rufous brown ; head ashy 

 grey or greyish black, in evident con- 

 trast. 

 e". Chest orange-rufous rvficollis $ , p. 76. 



