. The water birds of North America . ds, veryclearly proves the identity of the three supposed species respectively called by authors P. dilo-phus, P. fiuridanus, and P. cincinnatus, the latter representing a very marked geographical modi-fication of color ; theso-called fiuridanus, onthe other hand, repre-senting merely a slightmodification of examination inquestion shows thegeographical variationin this species to beof two kinds, viz. : (1)A more or less markedincrease of size to thenorthward, and (2) agradual change fromuniform glossy blacknuptial crests, in east-ern birds, to cres
. The water birds of North America . ds, veryclearly proves the identity of the three supposed species respectively called by authors P. dilo-phus, P. fiuridanus, and P. cincinnatus, the latter representing a very marked geographical modi-fication of color ; theso-called fiuridanus, onthe other hand, repre-senting merely a slightmodification of examination inquestion shows thegeographical variationin this species to beof two kinds, viz. : (1)A more or less markedincrease of size to thenorthward, and (2) agradual change fromuniform glossy blacknuptial crests, in east-ern birds, to crestsentirely pure white, orwith merely a slightadmixture of black, bare space on the head, and gular sac, rich orange. Feet and claws black. P. floridanus : — Adultmale, in spring: Upper mandible black, along the basal margins blight blue ; lower blight blue, curiouslyspotted with white. Iris light green, margins of eyelids light blue, spotted with white. Bare space onthe head and gular sac rich orange. Feet and claws grayish P. dilophus cincinnatus, nuptial dress. 152 TOTIPALMATE SWIMMERS — STEGAXOPODES. in Pacific coast examples ; specimens from the interior of the continent having the tufts mixedblack and white. The question of whether a subspecies floridanus should he recognized involvesthe expediency of recognizing a fourth race in the resident bird of the Califomian (including theLower Califomian) coast, which differs from the true P. cinrinnatus of the northern Pacific coastin exactly the same characters that distinguish the so-called floridanus from dilophus proper ;i. c, in smaller size, with relatively weaker bill, the difference in the two cases being apparentlygreater in the case of the western forms. Regarding the small Califomian bird with white crestsas being much more entitled to recognition as a race than floridanus, Mr. Ridgway has alreadyseparated it as such under the name of albociliatus. The following measurements of specimens from various localit
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectbirds, bookyear1884
