NO. 1116. 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



659 



Adult male.— lSo.d>3^2^, U.S.KM.; Chile, Maison YeiTeaux,iTo. 4096. 

 General color dark sooty brown, darker on rump and remiges, tlie 

 tail brownish black; greater wing-coverts light grayish brown, still 

 paler on margins, forming a conspicuous oblique bar across closed 

 wing; upper tail-coverts, sides of rump, and entire abdomen white; 

 under tail- coverts dusky, with white, triangular, basal spots, mostly 

 concealed; three outermost rectrices with basal portion of inner webs 



ASCERTAINED RANGE OF THE GENUS OCEANITES, KEYSEKLING AND 15LASIUS, IN THE 



GALAPAGOS AKCUIPELAGO. 



1. Oceanites gracilis (Elliot). 



white, this forming an acute angle posteriorly, abruptly defined against 

 the blackish color succeeding it. Bill, legs, and feet uniform black, 

 the webs wholly dusky. Total length (skin), 5.50; wing, 5.20 (second 

 quill longest, first shorter than third); tail, 2.35, forked for about 0.30; 

 culmen, 0.43, from nasal tubes, 0.25; tarsus, 1.15; middle toe and claw, 

 0.00. 

 The six Galapagos specimens in the collection of Messrs. Baur and 



