26 EGGS OF NORTH AMERICAN BIRDS. 



171. White-fkonted Goose, Anser albifrons. Eggs, 6 to 

 10, elliptical, yellowish white; 2.05 -f 2.95 to 2.10 -f 3.20. 

 Breeds in the far north, in May. 



171a. American White-fkonted Goose, Anser albifrona 

 gambeli. Eggs, indistinguishable from those of No. 171. 

 Breeds in Arctic North America. 



172. Canada Goose, JBranta canadensis. Eggs, 6 to 10, 

 elliptical, dirty white ; 2.35 + 3,40 to 2.35 -j- 3.50. Nests 

 placed on the ground. Breeds in the Northern United States 

 and British Provinces, in May. 



172a. HuTCHiNs's Goose, Branta canadensis hiitchinsii. 

 Eggs, similar to those of No, 172, but smaller ; 2.00 -f- 2.95 

 to 2.05 -|- 3.00, Breeds in the Arctic regions of North Amer- 

 ica. 



172&. White-cheeked Goose, Branta canadensis occiden- 

 talis. Eggs, similar to those of No. 172. Breeds in the 

 Northern Pacific coast region, 



172c. Cackling Goose, Branta canadensis minima. Eggs, 

 unknown. Breeds on the coast of Alaska. 



173. Bkant, Branta bernicla. Eggs, 6 to 10, elliptical, 

 dirty white; 1.82 -f 2.76 to 1,85 + 2.90. Nests placed on the 

 ground, in marshes. Breeds in the northern portion of the 

 Northern Hemisphere; in North America, mainly on the 

 Atlantic coast, in June. 



174. Black Brant, Branta nigricans. Eggs, 6 to 10, ellip- 

 tical, ivory-white; 1,80 -j- 2.75 to 1.85 + 2.92, Breeds in 

 Arctic America, in June. 



175. Barnacle Goose, Branta leticopsis. Eggs, 6 to 8, 

 elliptical, yellowish cream ; 1.85 + 2.75 to 1.87 -f 2.87. Extrju 

 limital ; northern parts of the Old World ; birds casual in 

 Eastern North America. 



176. Emperor Goose, JPhilate canagica. Eggs, elliptical, 

 white ; 2.90 -f- 3.10 to 3.25 -f 3.40. Breeds on the coasts and 

 islands of Alaska, the third week in June. 



177. Black-bellied Tree Duck, JDendrocygna autumnalis. 



