BIRDS OF NORTH AND MIDDLE AMERICA. 147 



Sylvia sialis (not Motacilla sialis Linnseus) Liciitenstein, Preis-Verz. Mex. Vog., 

 1830, 2; Journ. fiir Orn., 1863, 57 (reprint). 



Siaiia sialis Coues, Birds Northwest, 1874, 13, part; Birds Col. Val., 1878, 77, 

 part. — Salvin and Godman, Biol. Centr.-Am., Aves, i, 1879, 45, part (Real 

 del Monte; Cordova, Cerro del Gallego, Jalapa, and Mirador, Vera Cruz; Val- 

 ley of Mexico; La Parada and Juquila, Oaxaca). — Allen, Bull. Am. Mus. 

 N. H., V, 1893, 42 (Bavispe R., n. e. Sonora, Dec, Feb.). 



Siaiia wilsoni (not of Swainson) Sclater, Proc. Zool. Soc. Lond., 1856, 293 (Cerro 

 del Gallego, near Cordova, Vera Cruz); 1858, 297 (highlands of La Parada, 

 Oaxaca); 1859, 3G2 (Jalapa, Vera Cruz), 371 (Juquila, Oaxaca); Cat. Am. 

 Birds, 18G2, 10, part (Orizaba, Vera Cruz). 



[Siaiia] wilsoni Gray, Hand-list, i, 18G9, 229, no. 3312, part. — Sclater and Sal- 

 vin, Nom. Av. Neotr., 1873, 4, part (Mexico). 



Siaiia azurca (not Muscicapa azurca Stephens") Baird, Review Am. Birds, July, 

 1864, 62, part (Mirador, Vera Cruz, Mexico; coll. U. S. Nat. Mus.; ex Swain- 

 son, Philos. Mag., n. s., i, 1827, 369; nomen nudum!). — SuMicHRAST,.Meni. 

 Bost. Soc. N. H., i, 1869, 544 (temp. reg. Vera Cruz). — Seebohm, Cat. Birds 

 Brit. Mus., V, 1881, 331, part (in synonymy only). — Ferrari-Perez, Proc. 

 U. S. Nat. Mus., ix, 1886, 133 (San Martin Texmelucan, Puebla, Dec, Jan.; 

 Jalapa, Vera Cruz, Aug.). — Ridgway, Proc. U. S. Nat. Mus., ix, 1886, 133 

 (crit.). 



[Siaiia] azurca Sharpe, Hand-list, iv, 1903, 183. 



[Siaiia sialis] var. azurca Baird, Brewer, and Ridgway, Hist. N. Am. Birds, i, 

 1874, 62, part (e. Mexico). 



Siaiia sialis azurca Brewster, Auk, ii, Jan., 1885, 85 (Santa Rita Mts., Arizona, 

 June). — American Ornithologists' Union, Check List, 1886, no. 766a. — 

 Ridgway, Man. X. Am. Birds, 1887, 594.— Chapman, Bull. Am. Mus. N. H.. 

 X, 1898, 22 (Jalapa). 



iS'[i«/ioj sialis azurca Ridgw.\y, ^lan. N. Am. Birds, 1887, 581. 



S[ialia] s[ialis] azurca Coues, Key N. Am. Birds, 5th ed., i, 1903, 257. 



[Siaiia sialis]fulva Brewster, Auk, ii, Jan., 1885, 85 (Santa Rita Mts., Arizona; 

 coll. W. Brewster; name proposed for Arizona bird if distinct from true 

 azurea). 



SIALIA SIALIS GUATEMAL.<E Ridgway. 



GXTATEMALA BLUEBIRD. 



Similar to S. s. fiUva in coloration of inider parts and in longer 

 wing and tail, but like S. s. sialis in coloration of upper parts; slightly 

 larger than S. s. fulvci. 



Adult mfffe.— Length (skins), 14S-16S (loS); wing, 101.5-110.5 

 (105.5); tail, 65-72.5 (68.1); exposed culnien, 12-13 (12.6); tarsus, 

 20-21.5 (20.9); middle toe, 15-16.5 (16. 1)^ 



Adult female.— LewgiXi (skins), 150-157.5 (155); wing, 99.5-103.5 

 (101.4); tail, 62-66.5 (64.3); exposed culmen, 11-13 (12.4); tarsus, 

 20-21.5 (21.2); middle toe, 16-16.5 (16.3).'^ 



Highlands of Chiapas (San Cristobal), Guatemala (Coban; Duehas; 

 Tactic; Godines; San Geronimo; Quezaltenango; ridge above Toto- 

 nicapam; Coban to Cliisec; Hacienda Chancol; Capotillo; Zacata- 

 pequez; Volcan de Santa Maria), and Honduras (pine region, at 

 5,000 feet altitude; Siquetepeque; Segovia River). 



o Said to be <S. sialis sialis. b Fourteen specimens. c Seven specimens, 



