APPENDIX 



625 



Family OCEANITIDAE: Storm Petrels, Painos 



OCEANITES OCEANICUS OCEANICUS (Kuhl): Wilson's Storm 

 Petrel, Pardela de Wilson 



Procellaria oceanica Kuhl, 1820, Beitr. Zool., Abth. 1, p. 136, pi. 10, f. 1. (South 

 Georgia.) 



Small; entirely dark brownish gray except for white on upper and 

 undertail coverts. 



Description. — Length 150-180 mm. Adult (sexes alike), upper sur- 

 face, except for tail coverts, deep mouse gray; inner, middle and greater 

 wing coverts sometimes tipped white; upper tail coverts white; remiges 

 blackish; rectrices blackish on distal half, white on basal half; under- 

 surface mouse gray, with white on feathers of lower flanks and outer 

 undertail coverts; underwing coverts mouse gray, tipped white. 



Measurements. — Males (averages of 8 "chilensis," taken on or near 

 breeding grounds at Wallaston and Morton Islands, Nassau Bay, and 

 at Magallanes in the Strait of Magellan), wing 133.9, tail 57.7, culmen 

 11.6, tarsus 34.6 mm. 



Females (averages of 3 "chilensis" from the same localities), wing 

 138.3, tail 61.3, culmen 11, tarsus 35.7 mm. (Murphy, Oceanic Birds 

 of South America, 1936, p. 754). 



Accidental. Known in Panama from 1 specimen, a bird collected 

 near San Jose, Pearl Islands, off the Pacific coast, on August 29, 1969, 

 by Horace Loftin of the Smithsonian Pacific Seabird Project. Eisen- 

 mann identified the specimen as the subspecies chilensis Murphy 

 (Ridgely, 1976, p. 33). Bourne (in Palmer, Handbook of North 

 American Birds, vol. 1, 1962, pp. 244-245) considers birds of this form 

 too close to the other small-dimensioned populations of lower latitudes 

 to deserve subspecific rank, and includes them in nominate oceanicus. 

 Although the Wilson's Storm Petrel migrates regularly from its Ant- 

 arctic and sub-Antarctic breeding grounds to the North Atlantic, in 

 the Pacific it is very rare or casual north of the Equator. 



Family ARDEIDAE: Herons, Garzas 



[EGRETTA RUFESCENS (Gmelin): Reddish Egret, 

 Garzon Rojizo 



Ardca rufescens Gmelin, 1789, Syst. Nat., 1, pt. 2, p. 628. (Louisiana.) 



A dark-phase adult was seen and photographed on Isla Coiba, off 

 the Pacific Coast of Veraguas on April 12, 1976, by Ridgely {in Iitt.). 

 The normal range on the Pacific Coast is lower California and Mexico.] 



