242 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



oration from that of J/. ///. }iia)<n\ but decidedl3- .smaller than the last 

 named in all measurements except depth of bill. 



Adult male— \jQ\\gW\ (skins), 3;32.T-o6,5.8 (342.()); wing, 163.8-168.1 

 (165.9); tail, 157.5-167.6 (163.6); culmen. from ])a,se, 36.1-40.6 (38.6); 

 depth of bill at base, 13-15.2 (13.7); tarsus, 11.5-17.5 (15.7); middle 

 toe, 30.5-33 (32).^ 



Adult female. ~\,^\\gi\^ (skins), 270.5-285.8 (275.8); wing, 131.6- 

 139.7 (131.9); tail, 118.1-127.5 (121.5); culmen, from base, 30.5-33.3 

 (32.8); depth of bill at base, 11.1-12.2 (11.7); tarsus, 36.8-39.4 (38.1); 

 middle toe, 24.9-28.2 (26.2).' 



Coast plain of Sinaloa, northwestern Mexico (Mazatlan, Culiacan, 

 Escuinapa, etc.). 



Quiscalus major (not of Vieillot) Sclater, Cat. Am. Birds, 1862, 141, part 



(Mexico). 

 Quiscalus palustris (not Scaphidurus palustrls Swainson ?) Cassin, Proc. Ac. Nat. 



Sci. Phila., 1866, 411 (monogr.; Mazatlan). 

 [Quiscalus major'] var. palustris Baird, Brewer, and Ridgway, Hist. N. Am. 



Birds, ii, 1874, 214. 

 Quiscalus major var. palustris Lawrence, Mem. Bost. Soc. N. H., ii, 1874, 282 



(Mazatlan; habits). 

 (?) Quiscalus macrourus (not of Swainson) Nelson, North Am. Fauna, no. 14, 



1898, 52 (Tres Marias; straggler). 

 Quiscalus gruysoni Sclater, Ibis, 5th ser., ii, Apr., 1884, 157 (Mazatlan, n. w. 



Mexico; coll. Salvin and Godmau); Cat. Birds Brit. Mas., xi, 1886, 397. — 



Salvin and Godman, Biol. Centr.-Am., Aves, i, 1887, 484. 

 Qluiscalus} graysoni Eidgway, Man. N. Am. Birds, 1887, 881. 

 Scaphidurus major graysoni Ridgway, Proc. Wash. Ac. Sci., iii, Apr. 15, 1901, 152. 



MEGAQUISCALUS MAJOR NELSONI Ridgway. 

 SONORAN BOAT-TAIIED GRACKLE. 



Similar to M. m. graysoni^ but averaging slightly smaller, with 

 slightly longer bill; adult female much paler, the under parts (in 

 winter plumage) light wood brown, passing into brownish cream ))uff 

 on throat and chin and into grayish brown on flanks, thighs, and anal 

 region, the under tail-coverts dark gra3^ish brown; pileum and hind- 

 neck light sepia brown, the scapulars and interscapulars margined 

 with the same. 



Adult male. — Length (skins), 345.1-353.1 (348); wing, 159.5-167.1 

 (164.6); tail, 154.9-166.4 (161); culmen, from base, 39.4-40.4 (39.6); 

 depth of bill at base, 13; tarsus, 41.9-45.5 (43.7); middle toe, 30.7-31.8 

 (31).^ 



Adidt female.— l^Qwgih (skins), 279.4; wing, 129.5-131.6 (132.3); 

 tail, 120.1-124.5 (122.9); culmen, from base, 33.5-35.3 (34.3); depth 

 of bill at base, 11.4-12.2 (11.7); tarsus, 37.6-40.1 (39.1); middle toe, 

 25.9-27.9 (26. 9).=^ 



' Five specimens. * Six specimens. * Three specimens. 



