ORDER ANSERES. 83 
GENUS NOMONYX Rinpeway. 
Nomonyx Ripeway, Proc. U. S. Nat. Mus., III, 1880, 15. Type, by 
orig. desig., Anas dominica LINN®US. 
Noményx dominicus (LINN«us). Masked Duck. [168.] 
Anas dominica Linnmus, Syst. Nat., ed. 12, I, 1766, 201. (Santo 
Domingo.) 
Rance.— Tropical America. Breeds in the West Indies and in 
eastern South America to central Argentina; occurs rarely and locally 
from the lower Rio Grande in Texas south to Mexico, Guatemala, 
and western South America; recorded also from Wisconsin, Massa- 
chusetts, Vermont, and Maryland. 
SuBFAMILY ANSERINZs. GEESE. 
GENUS CHEN Bolr. 
Chen Bote, Isis, X, 1822, 563. Type, by monotypy, Anser hyperboreus 
PALLAS. 
SuBGENus CHEN, 
Chen hyperboreus (PAs). 
Rance.— Arctic North America, south in winter to southern United 
States and Mexico. 
a. Chen hyperboreus hyperboreus (PaLuas). Snow Goose. [169.] 
Anser hyperboreus Pauuas, Spice. Zool., I, Fase. vi, 1769, 25. (North- 
eastern Siberia.) 
Rance.— North America. Breeds from mouth of the Mackenzie east 
probably to Coronation Gulf and Melville Island; oecurs on the Arctic coast 
of northeastern Asia, but not known to breed there; winters from southern 
British Columbia, southern Colorado, and southern Illinois south to northern 
Lower California, central Mexico (Jalisco), Texas, and Louisiana, and on the 
Asiatic coast south to Japan; generally rare in eastern United States. 
b. Chen hyperboreus nivalis (J. R. Forster). Greater Snow Goose. [169a.] 
Anas nivalis Forster, Philos. Trans., LXII, 1772, 433. (Severn River, 
Hudson Bay, Canada.) 
