INTKODUCTION. 
From an examination lately made of this bird in the British Mnsenm, I am obliged to state tliat in my opinion it is 
only a light-colored variety of Lagopus Scoticus, and therefore should be considered as merely a synonym of that species, and 
not in any way distinct. 
20. LAGOPUS MUTUS, Plates XXI and XXII. 
21. “ KUPESTRIS, Plate XXIII. 
22. » HYPERBOREUS, Plate XXIV. 
23. LEUCURUS, Plate XXV. 
In this recapitulation I have given, I believe, eveiy known species among the Tetraoninae, which may at the present day be 
entitled to a specific distinctness. As I intend always to keep the subject before me, I shall be happy at any time to receive 
any additional information regarding these birds, or to learn of the discovery of new species. 
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