Bonasia bonasia grassmanni Zedlitz, Journ. für Ornith., vol. 68, No. 2, April 1920, p. 230.= Tetrastes bonasia bonasia Linnaeus, 1758
Holotype ? : Male ad., Slonim, Western Russia. 15. XII. 1916. Coll. O. von Zedlitz. No. 7146. - Measurements of type : wing : 165 mm.; tail : 133 mm.; culmen : 15 mm.; bill from nasal opening : 10,5 mm.; tarsus : 32 mm.Click on the picture for enlargement.