SUBFAMILY FULlGULIXsE. 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- } BIG BLACK HEAD. 

 lie green. f F. marila. $ 



b. Head and neck black, glossed with metal- / LITTLE 



lie purple. f BLACKHEAD. 



F. affinis. $ 



\ RINGED-NECK 



B. Ring around neck. > DUCK. 



) F. collaris. <$ 



C. White patch on wing. 



) BIG BLACK HEAD. 



a. Length of wing 8 inches or over. j- R marila $ 



LITTLE 

 BLACK HEAD. 



F. affinis. 9 



RINGED-NECK 

 DUCK. 



F. collaris. 9 



GENUS CAMPTOL&MUS 

 (Greek Ka^n-ris, kamptos, flexible; -(- Xcu/i6s, latinos, throat). 



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

 Type Anas 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 



