JESTRELATA LESSONI. 



27 



but never captured any birds; nor did I ever find any tracks upon the 

 earth. It certainly seemed as if the old birds had finally abandoned 

 them. It must be remembered, also, that one of these young birds was 

 found as early as September 15, and that I found Majaqueus with egg 

 on December 1*5. The "Mutton-birds" had certainly not begun to fly 

 before December. The two specimens preserved were captured on 

 I^lovember 10 ; the wings of No. C2 being then in full feather, but the 

 body still partially covered with down. 



No. 62, 16 by 38.75 by 12 ; bill, tarsus, and foot black ; iris dark-blue. 

 No. 66, 13.50 by 32 by 8 ; bill, tarsus, and foot black ; iris dark-blue ; 

 younger than 62. [Not seen by me — probably some Tuffinus. — E. C] 



^ STEEL AT A LESSONI, {Gam.) Cass. 

 White-headed Petrel. 



? Procellaria alba, Gmelin, Syst. Nat. i, 1788, p. 565. 



ViEiLLOT, Nouv. Diet. d'Hist. Nat. xxvii, 1817, p. 420. 

 ? Daptlon album, Shaw, Gen. Zool. xiii, 1825, p. 246, 

 ? Procellaria variegata, " Bonnaterre". {Bp. 4' Gray.) 

 Procellaria lessoni, Garnot, Ann. Sc. Nat. vii, 1826, p. 54, f. 4. 



Lesson, Traits d'Omith. 1831, p. 611. 



Gould, B. Aust. vii, pi. 49. 



Eeichenbach, Syst. Av. pi. 24, f. 2605; pi. 20, f. 339. 

 JUsirelata lessoni, Cassin, Proc. Acad. Nat. Sci. Phila. 1862, p. 327. 

 COUES, Proc. Acad. Nat. Sci. Phila. 1866, p. 142. 

 Ehantistes lessoni, Bonaparte, Compt. Rend, xlii, 1856, p. 768. 

 Procellaria leucocephala, Forst., Descr. An., ed. Licbt. 1844, p. 206. 

 Gould, Ann. Mag. N. H. xiii, 1844, p. 363. 

 JEstrelata leucocephala, Bonaparte, Consp. Av. ii, 1856, p. 189. 

 Procellaria vagabunda, " Solander", (Gray <.^- Bp.) 



This is a large, stout species, with a strong bill, and, in adult plumage, very baud- 

 some. What is more important, in some respects, it is likewise one of the better- 

 marked species of this difficult and thorougbly-iuvolved group. I have reason to 

 believe that its characters, relationships, and synonymy are worked out iu my mono- 

 graph above cited with fidelity and consequent reliability. Passing over some early 

 names, of probable but unproved application to this species, it seems that lessoni of 

 Garnot is the prior tenable name, though some authors give preference to leucocephala 

 ofForster. When this name was first proposed I have no means of knowing, but I 

 trace no published record of it back of 1844. This species has been figured by several 

 authors, and is, or should be, now well known. In lieu of further remarks, I beg to 

 refer to the paper already mentioned. — C. 



Measurements of a specimen. 



