502 DR. R. W.SHUFELDT ON THE ANATOMY OF THE [Nov. 16, 
Fig. 2. Fig. A. rs Fig. 6 x 
Fig. 1. Anconal aspect of left humerus of Tuchycineta thalassina. X 3. 
Fig. 2. Palmar aspect of the bone shown in fig. 1. x 3. 
Fig. 3. Anconal aspect of the left humerus of Micropus melanoleucus. X 4. 
(This was the Panyptila saxatilis of my first paper, but I have now 
adopted the nomenclature of the A. O. U. for this White-throated 
Rock-Swift.) 
Fig, 4. Palmar aspect of the bone shown in fig. 3. x 4. 
Fig. 5. Anconal aspect of the left humerus of Trochilus alexandri. x 8. 
Fig. 6. Palmar aspect of the bone shown in fig. 5. x 8. 
By “anconal” I mean that side of the bone which is next to the body of the 
bird, and the reverse of this is the ‘‘palmar” aspect. All these figures are 
drawn from:the specimens by the author, and p.f. calls attention to the 
pneumatic fo sa. 
