. The water birds of North America . F. glacialis : light phase. F. glacialis Rodgersi. are of an appreciably, and in a majority decidedly, more bluish or pearly gray than those fromthe North Pacific, and have, without exception, a dusky space immediately in front of the one of the three adult specimens shows any white on the wings. In all specimens from theNorth Pacific the gray is much darker, of a more smoky hue ; some have no trace of dusky infront of the eye, while others have a greater or less amount of white on the wing ; the type of 368 THE TUBE-NOSED SWIMMERS — TUBINARES. F. R
. The water birds of North America . F. glacialis : light phase. F. glacialis Rodgersi. are of an appreciably, and in a majority decidedly, more bluish or pearly gray than those fromthe North Pacific, and have, without exception, a dusky space immediately in front of the one of the three adult specimens shows any white on the wings. In all specimens from theNorth Pacific the gray is much darker, of a more smoky hue ; some have no trace of dusky infront of the eye, while others have a greater or less amount of white on the wing ; the type of 368 THE TUBE-NOSED SWIMMERS — TUBINARES. F. Rodgersi, Cass., having the wing almost entirely white, as are also the rump and upper tail-coverts. There is, however, absolutely no constancy in regard to the continuity of the gray, theshade of which varies from a pale smoky cinereous to a deep, almost slate-, gray. In order to testthe question of local versus individual variation in size and proportions, careful measurementshave been made of the twenty-four specimens examined,
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectbirds, bookyear1884
