314 BIEDS OF BRITISH GUIANA. 



head is a sign o£ age. The young bird has the head covered 

 with soft fine down. Its nidification is unknown. The "Macusis " 

 called it Kotaranoa, the " Warraus " Quow, and the " Arekunas " 

 Watarua. 



Mr. J. J. Queloh, who met with this species at the Great Falls 

 on the Demerara River, gives the following note (Timehri (2) iv. 

 p. 115) :-r-" The Bare-headed Chatterer or Quow-birds {Gymno- 

 cephalus cahus) bellowed, with a sound as though from a herd of 

 oxen grazing in the forest. The notes of this last bird are astonish- 

 ingly loud, but when heard from a distance, through the forest, they 

 are remarkably like the more musical sounding Oampanero (Chas- 

 morhynchus niveus), and might often be mistaken for it." .... 

 He also remarks on the bird from the Upper Berbice River {torn, 

 cit, p. 334): — "The Quow or Calf-birds (Gymnocephalus calvus) 

 were heard far oif in the forest, their bellowings mingled with the 

 hoarse caws of the Bultata Hawks {Ibycter americantis)." 



The following note is copied from Beebe (Our Search for a 

 Wilderness, p. 332) : — " Bare-headed Cotinga or Calf-bird. The 

 note has been compared to the lowing of a cow, but to me it 

 seemed much more musical resembling the humming of a goblet 

 when one's moistened finger is rubbed around the rim. The bird is 

 yellowish brown with a bare head, and keeps to the tops of the 

 trees." 



Genus GYMNODERUS Geoffr. 



Qymiioderus Geoffrey, Ann. Mus. Paris, xiii. p. 237, 1809. Type 

 O.foetidus (Linn.). 



Fig. 125. — Gymnoderus fwtidtis. 

 This genus is easily distinguished by the soft black velvety 



