16 



Above chocolate brown ; tail blackish, with 

 3 narrow white bands ; below thickly barred 

 with black and white ; throat brown. 

 51a. Micrastur ruficollis zonothorax (Cab.), J.f.O., Colombia, 

 1865, p. 406. Venezuela 



Barred Harrier-Hawk. 



Above (male) ashy brown (female blackish) ; 

 tail blackish with 4 irregular white bands ; 

 below whitish; breast finely barred with wavy 

 blackish lines ; lower abdomen white. 

 Micrastur gilvicollis (VieilL), N. Diet., x., p. 

 323 (1817). 

 White -throated Harrier-Hawk. 



52. 



53. 



Above blackish ; tail with 3 irregular white 



bands ; throat and cheeks pale grey ; below 



dull white, closely barred on breast and less so 



on abdomen with blackish. 



Micrastur guerilla guerilla, Cass.,Pr. Phil. Acad., 



1848, p. 87. 



Grey- throated Harrier-Hawk. 



S. America 

 from 



Colombia & 

 Amazonia to 

 E. Peru and 

 to 20° S. lat. 

 in Brazil. 



Mexico, 



Guatemala, 



Honduras. 



Above greyer ; chest suffused with rufescent 

 buff. 

 53a. Micrastur guerilla jugularis Gurney, List Brazil, 



Diurnal Bds. Prey, pp. 25, 117 (1884). Venezuela, 



Rufous-chested Harrier-Hawk. Colombia. 



Slightly larger than M. g. guerilla ; less pure 

 white below, and dusky bars broader and 

 heavier, especially on belly, thighs and under 

 tail-coverts. 

 53b. Micrastur guerilla interstes Bangs, Auk, 1907, Costa Rica to 

 p_ 289. Colombia and 



Bangs's Harrier-Hawk. Ecuador. 



Gen. XX GERANOSPIZIAS Sundev. (1873). 



Tarsus scaled bemna ; thighs without over- 

 hanging tuft of feathers ; ridge of bill greater 

 than half length of middle toe (without claw) ; 

 commissure slightly festooned. 

 Size moderate (length 16.5-24.5 in.). 



