TACHYTIIIOECHIS. 231 



Genus TACHYTRIOECHIS Kaup. 



Tacliyti'ioi'cliis Kaup, Class. Saiig. u. Togel, p. 123, 1S44. Type 

 T. alhicaudatus (Yieill.). 



This genus differs from the jireceding only in its oval nostrils 

 and the absence of a tuberenlar process. 



147. Tacliytriorcliis albicaudatus. 

 "White-tailed Buzzaed. 



Bufeo albicaudatus Yieill. X. Diet. d'Hist. Xat. iv. p. 477, 1S16 (British 



G-uiana). 

 Siifeo pferocles Cab. in Schomb. Eeis. Guian. iii. p. 739, ISIS. 

 TacJii/frio/'cJiis albicaudatus Shai-jDe, Cat. B. Brit. Mus. i. p. 162, 1S74 



(Demerara) ; Braboiu-ne &. Chubb, B. S. Amer. i. p. 66, no. 610, 1912. 

 Biiteo alhicaudatus Salvin, Ibis, 1SS6, p. 74 (Eoraima) ; Quelch, Timehi'i 



(2) vi. p. 160, 1S92. 



" Snake-HaMk/' "Big-chicken Hawk'' [QuelcJi). 



Adult male. Head, sides of face, throat, hind-neck, and upper 

 back greyish brown, the base of the feathers on the nape and hind- 

 neck white ; small coverts on the edo;e of the wino" white followed 

 br rufous, outer scapulars also rufous ; wings blackish with 

 obsolete grey bars on the quills and white bars and mottlings on 

 the inner webs towards the base ; rump, upper tail-coverts, and 

 tail white with a few dark Lars, a subterminal black band and 

 grej tips to the feathers of the last ; under surface narrowly 

 banded with grey on the sides of the bodr, axillaries. and under 

 wing-coverts. 



Total length 4G0 mm., culmen 31. wing 400, tail 164. tarsus 91, 

 middle toe and chiw 46. 



We do not know from what part of the Colony the male described 

 was collected. 



^iihdt femcde. Similar to the adult male but larger. ^\ ing 

 440 mm. 



Immature birds of this species are almost black varied by white 

 or rufous and the tail mottled with grey. 



Breeding-srason. Unknown in British Guiana. 



Xest. Unroc rded in British Guiana. 



Eags. Uudescribed from British Guiana. 



Range in British Guiana. Roraima ( Whitehf). 



Extralimital Range. South America generally to Chile and 

 Artrentina. 



