250 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



DRYOBATES SCALARIS SINALOENSIS Ridgway. 

 mazatlAn woodpecker. 



Similar to D. s. azelus, but decidedly larger and with sides of chest, 

 etc., streaked instead of spotted with black; similar to D. s. agnus, 

 but decidedly smaller. 



Adult male.— Lmgih (skins), 151-156 (153); wing, 94-95 (94.5); 

 tail, 43.5-53 (48.4); exposed culmen, 19-21.5 (20.3); tarsus, 16.5-17 

 (16.8); outer anterior toe, 12-13 (12.6).'^ 



Adult female.— LQVLgilx (skins), 140-157 (151); wing, 93-96 (94.6); 

 tail, 53.5-55.5 (54.5); exposed culmen, 17.5-19 (18.2); tarsus, 16-17 

 (16.3); outer anterior toe, 11-12.5 (11.8).* 



Western Mexico, in State of Sinaloa (Mazatlan; Presidio de 

 Mazatlan; CuHacan; Plomosas; Altata; Mount Juan Lisiarraga). 



Picus lucasianus (not P. lucasanus Xantus) Finsch, Abh. Nat. Ver. Bremen, 



1870, 354 (Mazatlan, Sinaloa). 

 Picus scalaris (not of Wagler) Lawrence, Mem. Boat. Soc. N. H., ii, 1874, 294, 



part (Mazatlan). 

 Dendrocopus scalaris Hargitt, Cat. Birds Brit. Mus., xviii, 1890, 246, part (in 



synonymy). — Salvin and Godman, Biol. Centr.-Am., Aves, ii, 1895, 435, 



part (Mazatlan; Presidio de Mazatlan). 

 [Picus scalaris] var. graysoni Baird, in Baird, Brewer, and Ridgway's Hist. N. 



Am. Birds, ii, 1874, 517, part (Mazatlan). 

 Picus scalaris var. graysoni Lawrence, Mem. Bost. Soc. N. H., ii, 1874, 294, 



part (Mazatlan). 

 D[ryohates] scalaris sinaloensis Ridgway, Man. N. Am. Birds, Sept. 27, 1887, 285 



(Mazatlan, Sinaloa; coll. U. S. Nat. Mus.). 

 Dryobates scalaris sinaloensis Ridgway, Man. N. Am. Birds, 1887, 592; 2d ed., 



1896, 613.— Lantz, Trans. Kansas Ac. Sci. for 1896-97 (1899), 220 (Altata, 



Sinaloa).— Miller (W. De W.), Bull. Am. Mus. N. H., xxi, 1905, 352 (Juan 



Lisiarraga, s. Sinaloa). — Oberholser, Proc. U. S. Nat. Mus., xli, 1911, 140, 



149 (monogr.). 



DRYOBATES SCALARIS GRAYSONI (Baird). 



TRES MARIAS WOODPECKER. 



Similar to D. s. sinaloensis, but decidedly larger, bars on lateral 

 rectrices averaging broader (except on proximal portion of inner web, 

 where usually narrower), primary coverts usually without trace of 

 whitish spots, and black bars on back, etc., decidedly broader; differ- 

 ing from D. s. agnus in the same characters (except width of bars on 

 lateral rectrices) and in smaller size (except bill and feet, which are 

 slightly larger). 



Adult male.— hength (skins), 157-183 (171); wing, 96.5-99 (97.7); 

 tail, 51-57 (54.5); exposed culmen, 20.5-23 (22.1); tarsus, 16.5-18 

 (17.4); outer anterior toe, 12.5-13 (12.9).*= 



a Four specimens. 6 Five specimens. c Nine specimens. 



