Notes on a Third Collection of Birds Made in Kauai , Hawaiian Islands , by Valdemar Knudsen

1888.—Puffinus cuneatus Salvin, Ibis, 1888 (July 1), p. 353. 1888.— Puffinus knudseni Stejnkger, Proc. U. S. Nat. Mus.. XI, 1888 (Nov. 8.), p. 93. The additional four specimens received from Mr. Knudsen do away with those differences which I imagined to exist between the Hawaiian Islands bird and the description of Salvin's P. cuneatus published only a few months before my own, and as the name given by him consequently has the priority, P. knudseni becomes a synonym of the former. Three of these specimens (Nos. 116764-1167G0) agree closely with the type, except that the sides of throat and neck are distinctly mottled with grayish. The fourth specimen (No. 116767), although agreeing with the others in dimensions and coloration above, differs considerably in having the whole under surface, including under wing-coverts, of a uniform brownish slate gray (very much like Eidgway's " mouse gray," Nom. Col., pi. ii, fig. 11), only slightly paler on middle of chin and throat, and somewhat darker on flanks and under tail-coverts. Coming, as it does, from the same locality, and agreeing with the others minutely in every other respect, I feel but little hesitation in pronouncing this uniformly colored specimen the dark " phase" of the typical bird with the white under side. In fact the two birds seem to bear the same relations to each other as the dark and the light specimens of P. sphenurus figured by Gould. He takes the latter to be the young