658 



BIRDS OF THE GALAPAGOS ARCHIPELAGO— RIDGWAY. vol.xix. 



Adult female. — Xo. i;^2760, TT.S.X.M. ; ou equator, COO uiiles east of 

 the Galapagos, March 24, 1891; C 11. Towusend. In coloration exactly 

 like the male as described above. Total length (skin), 5.80; wing, 4.90; 

 tail, 2.22, forked for 0.15; culmen, 0.48; nasal tubes, 0.23; tarsus, 0.92; 

 middle toe (with claw), 0.72. 



The seven specimens collected by Mr. Towusend are essentially alike 

 in coloration. One, however (Xo. i;i270S, adult male), has the feathers 

 of the abdomen very much worn, thus sliowiug a decidedly lighter hue 

 than specimens with these feathers in perfect condition. 



Another adult male (Xo. 117475, U.S.N.M.) is molting, and the newly 

 acquired greater wing-cov^erts are of a soft grayish brown, contrasting 

 strongly with the much browner color of the unshed greater coverts. 

 Some of the under tail-coverts also have distinctlj^ paler tips. 



Measurements of Procellaria tethys 



Genus OCEANITES, Keyserling and Blasius. 



Oceanlies, Keyserling and Blasius, Wirb. Eiir., I, 1840, p.xciii. Typi, Pro- 

 cellaria oceanica, Kiihl. 

 Range. — Cosmopolitan (pelagic). Galapagos Archipelago (one species, 

 found also along the Pacific coast of South America). 



OCEANITES GRACILIS (Elliot). 



Thalassidroma gracilis, Elliot, Ibis, October, 185!), p. 391 (west coast of America).' 

 Oceanitts (jracilin, CouES, Proc. Acad. Xat. Sci. Phila,, 1864, p. 85.— Kidgwav, 

 Man. N. Amer. Birds, 1887, p. 71. 



Specific character. — Belly white; webs of feet wholly dusky; tail more 

 or less emarginated, and with basal portion of inner webs of three out- 

 ermost rectrices white. Wing, 5.25-5.50; tail, 2.25-2.35; culmen, 0.40- 

 0.48, from nasal tubes, 0.22-0.25; tarsus, 1.14-1.24; middle toe, 0.78-0.80. 



Raiuje. — Coast of Chile; Galapagos Archipelago: Xorth Albemarle 

 and James islands (Baur and Adams). 



' Under "Remarks," Mr. Elliot .saj's: "This species is very abnndant ou the coast 

 of Chile:" there is thus reason to suppose that his tyx>« came from there. 



