THE HYBRID GROUSE. 595 
Both those shot in 1883 had the feet only slightly 
feathered. 
I think that we have now before us the following scale of 
the varieties of the wood-frequenting Grouse :—I. Urogallus ; 
II. Almost pure Urogallus; ILI. Reversion to Urogallus ; 
IV. Thorough Hybrid Cock, i.e. medius, of the usual type ; 
V. tetria. 
The following Table will make this evident at a glance :— 
2g | e¢ 
8 = a = S 
| 
Centimetres. 
Length from the atlas to | | 59.9 oe m9 oa ; 
the point of the sacrum : Sa Bare) SP 
Kilogrammes. 
Meee of the whole } 4-270 | 3-230 | 3-220 | 2-520 | 1-260 
No. of vertebree :— 
INfeC artes irate tt 13 } 13 } USA 2 ee } 
Atlan Aerts. i 1 TOT ate een 
ABACK ersriitstRetiern oes 2 2, 2 3 3 
IR elivisaeeent Mier ete xc il 1 iI 1 1 
DP Tri be ee 575 a 6 6 6 6 6 
The interesting fact that the two Hybrid Cocks first killed 
2Q 2 
