348 CALIFORNIA ACADEMY OF SCIENCES. 



PLATE XIV. 



The shoulders of the different species of Agelaius, showing the transi- 

 tion from the unmodified brown of the female in winter to the adult male 

 plumage in summer. Natural size. 



PLATE XV. 



Heads of the different species of Sphyrapious, showing the transition 

 from the brown plumage of the young, through successive stages of in- 

 creasing red, to the adult male of S. ruber. 



PLATE XVI. 

 Heads of the female and young of the genus Icterus. 



PLATE XVII. 



Heads of the adult males of the genus Icterus. 



PLATE XVIII. 



Color chart of the undifferentiated plumage, female or young, of the 

 genus Dendroica. For description of a single species, read the lines from 

 right to left; for comparison of the same part of the body, read the 

 columns. 



PLATE XIX. 



Color chart of the specialized plnmage, adult male in spring, of the 

 genns Dendroica. 



[Note. — In one or two instances the colors in the above charts were 

 supplied from descriptions; otherwise, from specimens.] 



