I2 IHE AMERICAN NATURALIST. [VoL. XXXV. 
brings to mind the skulls of some of the smaller grouse or 
ptarmigans. The cervico-dorsal region of the skeleton also is 
by no means truly columbine, though without difficulty we can 
Were Qut . 
eieton of Sand Grouse (Pter 
— P ate i e I 2 Q ~ T M T 
octes arenartus Pallas). No. 18,849, Coll. U. S. Nat. Museum. 
Reduced about one-third. 
see the pigeon in the pectoral limb, the sternum, the pelvis, 
the ribs perhaps; but to a less extent in the shoulder girdle 
and the bones of the pelvic extremities, 
