326 COMPARATIVE ZOOLOGY. 
paratus, though all do not sing. The anterior face of the 
tarsus is one continuous plate, or divided transversely into 
Fig. 317.—Kingfisher (Ceryle). 
large scales; and the plates on the sides meet behind in a 
ridge. The toes, always three in front and one behind, are 
——_—SSS_=_==___====== 
Fig. 3l8.—Swallow (Hirundo). 
