TETRAONID.E — TllE GKOUSE — TETKAO. 



525 



Gexus TETRAO, Lixxjeus. 



Tiirao, LINX.ECS, Syst. Xat. 1744. (Type, T. urogallas, L., au European species.) 



Gi-;x. Char. Tail loiigtlimed, slightly n.irrowoil to the squai-o or somewhat rounded 

 tip; about two thmls the wing ; the leathers with stiflened shafts. Tarsus feathered to 



and between the bases of the toes. No unusual feathers on the side of throat. Culnien 

 between the nasal fossa; nearly half the total length. Color nxostly black. 

 Inhaljit wooded regions. 



Mr. I). G. Elliott, in Vyw. Acad. Xat. Sc. of Pliil. XVI. 2:'., Fol.. 1864, 

 ]ii'oposes to .separate the T. ohsrvrus and T. Richanlmnii from the genu-s 

 Tdnw (wliicli is tlieu represented only in Europe), on account of their 

 greater number of tail feathers (twenty), and otlier differences. Tlie name 

 pniposed for the new genus is Dcndragapus, from the Greek for tree-lover, 

 BtfBpov, ayaTTO}. 



The other American species with sixteen tail feathers, etc. (Ciniadcnsis 

 and FrnTtklinii) had before been separated nuder the name of Caiiacc, by 

 Keiclienbach. 



