procellariWjE—procellariin.E: petrels. 1043 



Kevillagigedo Group, Mexico, to Guadalupe Island, Lower Califoruia, and to southern Califor- 

 nia ; N. to Cape Flattery. New to the Key. Anthony, Auk, Jan. 1898, p. 37 ; A. O. U. 

 Comm. Suppl. List, Auk, Jan. 1899, p. 101, No. 105.2. 



O. cryptoleucu'ra. (Gr. Kpvnros, liruptos., hidden; XevKos, leukos, white; ovpd, oura, tail; 

 referring to concealed white bases of tail-feathers.) Hawaiian Petrel. Sandwich Island 

 Petrel. Knudsen's Petrel. Similar to Leach's Petrel; hmger upper tail-coverts broadly 

 tipped with black, 0.25-0.50; tail-feathers, except middle pair, extensively white toward their 

 bases for about 1.00, and with white shafts ; tail lightly forked. Bill and feet entirely black, 

 as in all the foregoing species of this genus ; claws short and wide. Length about 7.75 ; ex- 

 tent 19.00; wing averaging 6.00, said to range from 5.80-G.30 ; tail 3-00-3.25, forked 0.15- 

 0.25; tarsus 0.85-0.90; bill 0.80 ; middle toe 0.90 ; outer rather less ; inner 0.70. Originally 

 described from the Sandwich Islands; accredited to the Galapagos and Madeira. New to the 

 Key; accidental at Washington, D. C, Aug. 28, 29, 1893; two specimens .secured, harbin- 

 gers of the annexation of the Hawaiian avifauna to that of the United States ! Also, Kent, 

 England, Dec. 5, 1895. (See Auk, July, 1897, pp. 297-299.) CymocJiorea cnjj)toleiicura 

 Eidgw. Pr. U. S. Nat. Mus. iv. Mar. 1882, p. 337; Oceanodroma crijptoleucura Ridgw. Man. 

 1887, p. 71 ; Pr. U. S. Nat. Mus. xix, for 1896, p. 654 ; A. 0. U. Suppl. List, Auk, Jan. 1899, 

 p. 101, No. [106.2.]. 



O. inacrodac'tyla. (Gr. /xa/cpo's, makros, long; MktvXov, daktidon, a digit, whether finger or 

 toe.) Guadalupe Petrel. Similar to Leach's Petrel; larger and darker; white of upper 

 tail-coverts restricted, these feathers being broadly tipped with black ; crown darker than 

 back, lightening somewhat on the forehead ; bill stouter at base than that of leucorrhoa ; tail 

 longer and more deeply forked. Length about 8.50; wing 6.50; tail nearly 4.00, forked 1.00 

 or more ; tarsus 0.85-1.00; middle toe and claw 1.10-1.20. Guadalupe Island, Lower Cali- 

 fornia. An interesting Petrel, apparently a valid species, described as 0. leucorhoa macro- 

 dactijla by Bryant, Bull. Cala. Acad. Sci. ii. No. 8, July, 1887, p. 450, tliough earlier 

 noticed in the same publication (p. 276) as 0. leucorhoa ; raised to specific rank by the A. 0. U. 

 Committee as 0. macrodacfi/la, Suppl. List, 1889, p. 5; A. 0- U. List, 2d ed. 1895, No. 106.1. 

 Salvin, Cat. B. Brit. Mus. xxv, 1896, p. 351, where in character of the upper tail-coverts the 

 species is compared with cryptoleiicura of the Sandwich Islands and Galapagos. Cymochorea 

 macrodacti/la CouES, Key, 4th ed. 1890, p. 906. 



O. melan'ia. (Gr. fieXavia, vielania, blackness. Fig 710.) Black Fork-tailed Petrel. 

 Form of leucorrhoa very nearly ; bill more robust ; tarsus a little longer than middle toe and claw. 

 No white or whitish anywhere. Adult : Plumage sooty brown- 

 ish-black, darkest above and on head, more smoky-brown on 

 under parts, grayer on wing-coverts, quite black on wing- and 

 tail-feathers; bill and feet black; iris brown. Length 9.00; 

 extent 18.50; wing 6.75; tail 4.00, forked 1.20 ; tibia bare 0.50; 

 tarsus 1.20; middle toe and claw 1.10; bill 0.65; gape 0.95; 

 height or width at base 0.25 ; nasal tubes 0.30. Coast of Mex- 

 ico N. to southern California; Cape St. Lucas, Lower Califor- 

 nia, and some of the islands off the coast. Breeds on San pj,,. 710. — Black Fork-tailed 

 Benito and Los Coronados Islands — on San Benito Island Petrel, nat. size. (Ad. nat. del. 

 more numerously than O. socorroensis, but in company with and 



in a similar manner (see beyond). Egg white, larger than that of the Socorro Petrel ; average 

 1.35 X 100 (Anthony, Nidologist, Oct. 1896, p. 16). The species remained for long rare and 

 little iiiiown. (Cymochorea mehrna of former editions of the Key. 0. totcnsetidi Kidgw.) 

 O. hoinoch'roa. (Gr. 6/xof, omos, like, equal; XP"**' chroa, color.) ASHY Fork-tailed 

 Petrel. Adult: Somewhat like the last; smaller, with short, weak, com})resse(l bill, and 

 tarsus no longer than middle toe and claw. No white anywhere ; but under wing-coverts with 



