HAKPAGUS. 273 



172. Harpagus bidentatus. 



Double-toothed Hawk. 



Falco hidentatus Lath. Incl. Om. i. ji. 38, 1790 (Cayenne). 



Harpagus hidentattis Cab. in Schomb. Reis. Gruian. iii. p. 73-1, 1848 ; 

 Sharpe, Cat. B. Brit. Mus. i. p. 362, 1874 (Demerara) ; Salvin, Ibis, 

 1886, p. 77 (Bartica Grove); Quelcb, Timehri (2) v. pp. 104, 105, 

 1891 (Greorgetown) ; id. op. cit. vi. p. 127, 1892 ; Brabourne & 

 Chubb, B. S. Amer. i. p. 72, no. 664, 1912. 



" Cuckoo-Falcon " [Qaelcli). 



Adult male. Crown o£ head, sides of face, wings, back, and upper 

 tail-coverts slate-grey, the lesser wing-coverts, bastard-wing, and 

 primary-coverts darker and inclining to blackish, the primary and 

 secondary quills have dark bands and notched with white on the 

 inner webs ; the scapulars are barred with white and have twin 

 white spots towards the tips ; the lateral upper tail-coverts have a 

 spot of white on the outer webs ; tail blackish, tipped and banded 

 with grey and white ; throat white with a dark mesial streak ; 

 breast and abdomen deep chestnut barred more or less with white 

 on the latter; under tail-coverts wdiite ; under wing-coverts bufP. 

 " Bill, upper mandible black, lower mandible light slate-colour ; 

 iris pink ; legs and toes light chrome-yellow^ claws black" 

 {H. Whitehj). 



Total length 330 mm., culmen (including the cere) 23, wing 213, 

 tail 151, tarsus 41^ middle toe and claw 35. 



The male described was collected on the Supenaam River. 



The immature birds of this species are brown above with rufous 

 edges to the feathers and buffy-white below with dark shaft-streaks 

 on the breast. 



Adult female. Similar to the adult male but rather larger. Wing 

 225 mm. 



Breeding-season. Unknown in British Guiana. 



Nest. Its nest is built in tall trees (^Schomhurgk). 



Eggs. Undescribed from British Guiana. 



Range in Britisli Guiana. Upper Takutu Mountains,, Ituribisi 

 River, Supenaam lliver, Bartica, Kamakabra River, Bonasika 

 River, Abary River, Anarica River (^McConnell collection^. 



Extralimital Range. A'^enezuela, Colombia, Peru. 



Hahits. Schoniburgk states (Reis. Guian. iii. p. 734) that this 

 species is only found in the dense woods, where, as a rule, it sits 

 in the tall trees, in which it builds its nest. It was often seen to 



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