497 



THALASSIDKOMA LEUCOKKHOA. 



(LEACH'S PETREL.) 



Procellaria leucorhoa, Vieill. Nouv. Diet. xxv. p. 422 (1817). 



Procellaria leachii, Temm. Man. d'Orn. ii. p. 812 (1820). 



Hydrobates leachii (Temm.), Boie, Isis, 1822, p. 562. 



Procellaria bullockii, Flem. Brit. Anim. p. 136. no. 219 (1828). 



? Procellaria pelagica, Pall. Zoogr. E. A. ii. p. 316 (1831, nee Linn.). 



Thalassidroma bullockii (Flem.), Selby, Brit. Orn. ii. p. 537 (1833). 



Thalassidroma leachii, Bp. Comp. List, p. 64 (1838). 



Cymochorea leucorrhoa (Vieill.), Coues, Proc. Nat. Hist. Soc. Philad. 1864, p. 76. 



Thalassidroma leucorrhoa (Vieill.), Degl. & Gerbe, Orn. Eur. ii. p. 387 (1867). 



Thalassidrome cul-blanc, French; Per gabelschwdnzige Schwalbensturmvogel, German ; Petrel 

 de Leach, Portuguese ; Leachs Stormsvale, Norwegian ; Klykstjertad Stormsvale, Swedish. 



Figurce notabiles. 



Werner's Atlas, Palmipedes, pi. 27 ; Kjserb. Orn. Dan. taf. liv. fig. 9 ; Fritsch, Vog. Eur. 

 pi. 61. fig. 5 ; Gould, B. of Eur. pi. 447. fig. 1 ; id. B. of G. Brit. v. pi. 85 ; Naumann, 

 Vog. Deutschl. taf. 275. fig. 2 ; Schlegel, Vog. Nederl. pi. 331 ; Audubon, B. of Am. 

 pi. 459. 



ad. fuliginoso-nigricanti-brunneus : capite, pectore et dorso cinereo tinctis : remigibus nigricantibus, secun- 

 dariis intimis tectribusque alarum majoribus et medianis brunnescenti-griseis, versus apicem grisescenti- 

 albidis : supra^audalibus albis, nonnullis in pogonio externo fuliginoso marginatis et eodem colore 

 apicatis : cauda, bifurcata, fuliginoso-nigra, subcaudalibus centralibus grisescenti-fuliginosis, lateralibus 

 albis : rostro et pedibus nigris : iride saturate fusca. 



Pall, ubique lanugine indutus, grisescenti-fuliginosus. 



Adult Male (Bay of Fundy, May) . Head, neck, back, scapulars, and underparts generally, sooty blackish 

 brown, on the head, breast, and back with a greyish tinge, which shows very clearly in some lights ; 

 quills and tail brownish black ; tail deeply forked ; inner secondaries and wing-coverts, excepting the 

 smaller ones, brownish grey, becoming lighter in colour towards the tips of the feathers; upper tail- 

 coverts white, one or two of the central feathers being marked along the outer web and tipped with 

 dull light sooty brown ; central under tail-coverts sooty brown, the outer feathers on each side white ; 

 bill and feet black; iris dark brown. Total length about 75 inches, culmen 0"75, wing 6-0, tail 3*5, 

 tarsus l'O, bare portion of tibia - 3. 



Nestling (Bay of Fundy, May) . Covered with long, loose, sooty, blackish grey down, which is so long as 

 to cover every portion of the body, and even the beak, causing it to resemble a long-haired mouse 

 rather than a bird. 



o2 



