656 



BIRDS OF THE GALAPAGOS ARCHIPELAGO— RIDG WAY. vol.xix. 



The four iidult males of 0. cryptoleucura collected among tbe Gala- 

 pagos by Mr. Townseiul agree very closely with Hawaiian examples 

 collected by Mr. \'. Kiiudsen, though slight dirt'erences are apparent. 

 They are perceptibly darker in general color, though this may be due 

 to their fresher condition; the black tips to the longer uj^per tailcov- 

 erts average rather narrower; the bill is a little thicker, and the tarsi 

 and toes are quite decidedly shorter, averaging 0.83 and 0.82, resjjec- 

 tively, against 0.80 and 0.95 in Hawaiian specimens. It is possible, how- 

 ever, these slight diiferences might disappear if a larger number of 

 specimens were compared. 



Measurements of Oceanodrovia cryptoleucura. 



Genus PROCELLARIA, Linnaeus. 



Procellaria, LinN/EUS, .Syst. Nat., 10th ed.. I, 1758, p. 131. Ty])e, liy cliiuiuatioii, 

 P. pclatjica, LiniiiCHS. 



Range. — Cosmopolitan (pelagic). Galapagos Archipelago (one pecu- 

 liar species). 



PROCELLARIA TETHYS. Bonaparte. 



I'roieUaria iethi/s, Bonaparte, Compt. Komi., XXXVIII, 1854, p. t>62 (Notes 

 Orn., p. 92) (Galapagos); XLII, 1856, fig. 769; Consp Av., II, 1857, p. 197.— 

 CorES, Proc. Acad. Nat. Sci. Phila., 1864, p. 80.— Salvix, Tiiins. Zool. Soo., 

 IX, Pt. i.x, 1876, p. 507, pi. r.xxxviii, fig. 2 (Galapagos?).— Eipgwav, Man. N. 

 Amer. Birds, 1887, p. 70.— TowNSExn, Proc. U. S. Nat. Mus., XTII, 1890, 

 p. 142 (uear ecjuator, 400 and 600 miles east of Galapagos); Bull. Mus. 

 Comp. Zool., XXVII, 189.5, j). 126 (otV Chatham Island, and 400 miles east of 

 Galapagos). 



Specific characters. — Similar to P. pelagica, Linnteus, but longer upper 

 tail-coverts entirely white; no white on under side of wings; tail emar- 

 giuated. Wing, 4.90-5.03; tail, 2.22-2.r)3, forked for 0.15-0.25; culmeu, 



