314 BIRDS OF BRITISH GL'IANA. 



liead is a sign o£ a^e. The young bird has the head covered 

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

 called it Kotaranoa, the " Warraus " Qiioiv,nnil the "Arekunas" 

 Wata7'i(a. 



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

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

 p. 115) : — " The Bare-headed ("hatterer or Quow-birds (G//mno- 

 cejyJialus calvus) 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 ('ampanero [Chas- 

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

 He also remarks on the bird from the Upper Berbice River {to7)i, 

 cit. p. 334): — "The Quow or Calf-birds {(Jijinnocephalus calmis) 

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

 hoarse caws of the Bultata Hawks (Tbijder americanus)''' 



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

 Wilderness, p. 332): — " Bare-headed C^otinga 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 kee[)S to the tops of the 

 trees." 



Genus GYMNODERUS Geofi'r. 



Gymnochriis Geoffroy, Ann. Mus. Taris, xiii. p. 237, 1S09. Type 

 G.fcetidiis (Linn.). 



Fig. \2~). — Gi/mnn(l/rusf(i>fi(lns. 

 This genus is easily distinoui.vhed bv the soft black velvetv 



