352 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



ZENAIDURA GRAYSON! Lawrence. 



SOCORRO MOURNING DOVE. 



Adult male. — Forehead and anterior half of crown pecan brown, 

 deepening into vinaceous-russet on sides of crown and occiput (super- 

 ciliary and supra-auricular regions); posterior half of crown and 

 occiput slate-gray, the hindneck similar but slightly browner (nearly 

 neutral gray) ; rest of upper parts light bister brown or drab-brown, 

 the proximal larger wing-coverts and secondaries with a few large 

 roundish spots of black; alula and primary coverts dark grayish 

 brown, the primaries similar but darker, narrowly edged with paler, 

 the edgings more distinct and dull whitish on the two outermost pri- 

 maries; four middle rectrices deep grayish brown, the second pair 

 with a blackish band across inner web and part of outer web; remain- 

 ing rectrices becoming successively grayer, with the black post- 

 median band more distinct (and extending quite across outer web, 

 except on outermost rectrix), the gray of terminal portion decidedly 

 lighter than that of basal portion, the outermost rectrix with distal 

 portion of outer web dull white, the proximal portion light gray; 

 suborbital, auricular, and malar regions and under parts plain bright 

 mikado brown or deep orange-cinnamon, paler on chin and upper 

 throat; sides of hindneck glossed with metallic purple; a small sub- 

 auricular spot of glossy blue-black; outer portion of sides and flanks, 

 axillars, and under wing-coverts plain slate-gray; bill black; legs and 

 feet pale brownish (lake red in life?); length (skin), 306; wing, 156; 

 tail, 135; exposed culmen, 16; tarsus, 27.5; middle toe, 26." 



Adult female. — Similar to the adult male but slightly duller in color, 

 especially the posterior portion of head and neck, where the gray is 

 less pure and less strongly contrasted, and metallic gloss on sides of 

 neck less brilliant; length (skins), 283-306 (294.5); wing, 147-149 

 (148); tail, 120-131.5 (125.7); exposed culmen, 16-16.5 (16.2); tarsus, 

 27; middle toe, 24-24.5 (24.2). & 



Young. — Much duller in coloration than the adult female, the 

 occiput, etc., dull grayish brown instead of gray, the under parts 

 duller, wing-coverts and scapulars narrowly (and rather indistinctly) 

 margined terminally with lighter, more buffy, brown or cinnamon, 

 and without black subauricular spot or metallic gloss on sides of neck. 



Socorro Island, Revillagigedo group, western Mexico. 



Zenaidura graysoni Baird, ms., Lawrence, Ann. Lye. Nat. Hist. N. Y., x, 1871, 

 17 (Socorro Island, Revillagigedo group, w. Mexico; coll. U. S. Nat. Mus.; 

 =young); Mem. Boat. Soc. N. H., ii, 1874, 304 (habits).— Grayson, Proc. 

 Boat. Soc. N. H., xiv, 1871, 299.— Salvin, Ibis, 1874, 312 (crit.).— Baird, 

 Brewer, and Eidgwat, Hist. N. Am. Birds, iii, 1874, 382.— Townsend 

 (C. H.), Proc. U. S. Nat. Mus., xiii, 1890, 135 (descr. adult female).— Salva- 



a One specimen . b Two specimens. 



