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 ; 
I. Almost pure Urogallus; III. Reversion to Urogallus ; 
IV. Thorough Hybrid Cock, i.e. medius, of the usual type ; 
V. tetrix, 
The following Table will make this evident at a glance :— 
Be | 23 
Ss aS 
P| Sai ee] 
~s vA . 
s | 8f| BF) & ce 
$ Z| 5 as) s 
s = = BS 
<q I 
Centimetres. 
Length from the atlas to || 50.9 495 | 472 | 43:8 | 39-4 
the point of the sacrum 
Kilogrammes. 
ey of the whole } 4-270 | 3-230 | 3-220 | 2-590 | 1-260 
No. of vertebrae :— 
IN GOK 4. dednaticsiaciitere a a] =| a 
Atlas chic. eripaares 1 1 1 1 1 
Bale iain ca. at ccewienes 2 2 2 3 3 
Pelvis .........+4. 1 1 1 1 1 
Waal ass oasrcsciea eases 6 6 6 6 6 
23 23 23 23 23 
The interesting fact that the two Hybrid Cocks first killed 
2Q2 
