764 U. S. p. E, E. EXP. AND SURVEYS ZOOLOGY — GENEEAL REPORT. 



Comparative measurements of species. 



BERNICLA CANADENSIS, Boie. 

 Canada Goose. 



Anas canadcMis, Linn. Syst. Nat. I, 176G, 198.-5'orster, PbU. Trans. LXII, 1772, -383.— Wils. Am. Orn. VIII, 



1814,52; pi. Ivii. 

 Anser canadensis, Vieill. Nouv. Diet. — Sw. & Rich. F. Bor. Am. II, 1831, 4G8. — Nutt. Man. II, 349. — Aud. Orn. 



Biog. Ill, 1835, 1: A', 607; pi. 201.— Ib. Syn. 271).— Ib. Birds Amer. VI, 1843, 178; pi. 376. 

 Qugnus canadensis, Steph. thaw's Zoo). Xll, 11, 1824, 19. 

 Bmiicla canadnisis, Boie, Isis, 1826, 921. 

 ? Amer 2iarfipcs, CissiN, Pr. A. N. Sc. VI,' Oct. 1852, 188. (Vera Cruz.) 



Sp, Cu. — Tail of eighteen featliers. Head, neck, bill, and feet, deep black. A large triangular patch of white on the cheeks 

 behind the eye; the two of opposite sides broadly confluent beneath, but not extending to the rami of lower jaw; a few whitish 

 feathers on lower eyelid. Upper parts brown, edged with paler. Under parts light, with a tinge of purple gray, sometimes a 

 bhade of smoky brown ; the edges of the feathers paler; the color of the body of the feathers, though similar, becoming deeper 

 on the sides, tibia, axiUars, aud inside of wings. The gray of the belly passes gradually into white on the anal region and 

 under coverts; the upper tail coverts are pure white. The primary (luills and rump are very dark blackish brown ; the tail 

 feathers are black. Length, 35 ; wing, 16 ; tarsus, 3.10 ; commissure, 2.10. 



I/ah. — Whole of North America. Accidental in Europe. 



In comparing quite a large series of Canada geese togetlier, I liave found very great 

 discrejiancies in dimensions, as will Le sufficiently evident from the table of measurements. I 

 find almost every size between wide extremes, with great variations in size and proportions of 

 the bill, as well as much.difference in the shade and continuity of color. In several instances 



