SUBFAMIL Y FULIGCLhW-E. 



287 



the differences, with gradations, that were attributed to the two 

 birds. The question, therefore, as to whether there is both a dis- 

 tinct species and sub-species of the Big Black Head would seem 

 to be clearly settled in the negative. 



KEY TO THE SPECIES. 



A . No ring around neck. 



a. Head and neck black, glossed with metal- 

 lic green. 



i. Head and neck black, glossed with metal- 

 lic purple. 



B. Ring around neck. 



C. White patch on wing. 

 a. Length of wing 8:^^ inches or over. 



d. Length of wing 8^ inches or less. 



D. Bluish gray patch on wing. 



GENUS CAMPTOL/EMUS 



/ BIG BLACK HEAD. 



S F. niarila. 5 



1 LITTLE 



BLACK HEAD. 



' F. affinis. 5 



RINGED-NECK 

 DUCK. 



F. collaris. 5 



BIG BLACK HEAD. 



F. marila. $ 



LITTLE 

 BLACK HEAD. 



F. affinis. $ 



RINGED-NECK 

 DUCK. 



F. collaris. 9 



(Greek Kafi,irr6$, kamptos, flexible; -(- "Kai/xds, laimos, throat). 



Camptoleemus, G. R. Gray. List. Gen. B. ed. 2, 1841, p. 95. 

 Type Alias labradorius, Gmel. 



Bill about as long as head, very broad, height at base not 

 equal to-greatest width. A membranous expansion, on the edge 

 of maxilla toward the tip, increases considerably the normal width 

 of the bill. Nail prominent, forming a hook at tip. Nostrils 

 oblong, basal, and situated rather high on the side of maxilla. 

 Loral and cheek feathers stiff, with horny tips, extending on to 

 base of maxilla in a convex line. Tail of fourteen feathers, 

 short. 



The single, rather peculiar species, comprising this genus, 

 while very common on certain parts of our eastern seaboard fifty 



