FLA I TVS. 19 



Genus PLAUTUS BrI'nnich. (Pago 10, pi. Y., fig. 1.) 



Species. 



Upper pai-ts uniform black, the secondaries sharply tipped with white; lower 

 parts pure white. Summer plumage : Chin, throat, fure-ueek, and sides of head and 

 nock, velvet}^ dark snuff-browu, or soft blackish brown; a large oval patch of white 

 covering the greater part of the space between bill and eyes ; bill black, its grooves 

 whitish. Length about 28.00-30.00, wing 5.75, culmen 3.15-3.50, greatest depth of 

 bill about 1.50. Egg (average size) 4.67 X 2.91, pyriforna-ovate, pale olive-buify, 

 variously marked with brown and black. Hab. Believed to be now extinct; for- 

 merly (previous to 18-1-1), coasts and islands of the North Atlantic, chiefly on the 

 American side ; south to Massachusetts Bay, north to the Arctic circle. 



33. P. impennis (Li.w.). Great Auk. 



Genus ALLE Link. (Page 10, pi. VI., fig. 4.) 



. Species. 



Head, neck, and upj)er parts black, the secondaries sharply tipped with white, 

 and scapulars streaked with the same ; lower parts white, the flanks striped with 

 dusky. Summer plumage : Sides of head and neck, with chin, throat, and chest, 

 uniform dark sooty brown. Winter adult : Chin, throat, etc., white, this color ex- 

 tending upward toward occiput; feathers of chest dusky at base only. Young : 

 Similar to winter adult, but bill smaller and weaker, and colors duller. Downy 

 young : Uniform sooty slate-color, paler or more grayish below. Length 7.25-9.15, 

 wing 4.50-4.75, culmen .50. Egg 1.90 X 1-29, ovate, very pale bluish green or green- 

 ish white. Hah. Arctic Ocean and coasts of the Xorth Atlantic ; on the American 

 side south, in winter, to New Jersey; accidental on Detroit Eiver. 



34. A. alle (Linn.). Dovekie. 



