248 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



Nutt. Orn. Club, vii, 1882, 145 (Arizona; crit.); Bull., Mus. Comp. Zool., 

 xli, 1902, 172 (Triunfo, Lower California, Dec.j.^BELDixG, Proc. U. S.Nat. 

 Mus., V, 1883, 537 (La Paz, Lower California, winter). — American Ornitholo- 

 gists' Union, Check List, 1886, no. 622a, part. — Ferrari-Perez, Proc. U. S. 

 Nat. Mus., ix, 1886, 138 (Huexotitla and Puebla, Puebla, Oct.).— Lloyd, 

 Auk, iv, 1887, 294 (Concho Co., etc., w. Texas; habits). — Scott, Auk, v, 

 1888, 31 (Tucson, Santa Catalina Mts. , etc., Arizona). — Beckham, Proc. U. S. 

 Nat. Mus., X, 1888, 683 (Corpus Christi, San Antonio, etc., Texas; habits).— 

 Cooke, Bird Migr. Miss. Val., 1888, 233, part (w. Manitoba, w. Texas, 

 etc.— Thompson, Proc. U. S. Nat. Mus., xiii, 1890, 613 (Manitoba^summer; 

 habits). — Goss, Hist. Birds Kansas, 1891, 520 (resident, but chiefly sum- 

 mer).— Fisher, North Am. Fauna, no. 7, 1893, 114 (desert region, s. Cali- 

 fornia and Nevada). — Jouv, Proc. U. S. Nat. Mus., xvi, 1894, 778 (Soledad, 

 San Luis Potosi, Dec; Nogales, Sonora, breeding; descr. nest). — Grinnell 

 (J.), Pub. ii,Pasadena Acad. Sci., 1898, 43, (Los Angeles Co., California, winter 

 straggler); Pacific Coast Avifauna, no. 3, 1902, 61 (resident e. of Sierra 

 Nevada, from Shasta Valley and Plumas Co. to Fort Yuma and Indio). — 

 Bailey (Florence M.), Handb. Birds W. U. S., 1902, 392. 



Ll^aniusl ludovicianus excubitorides Ridgway, Man. N. Am. Birds, 1887, 467, part. 



Lanius ludomcianus excubitoroides J^KEsv , Bull. Nutt. Orn. Club, vi, 1881, 89 (San 

 Juan Co., Colorado; habits). — Allen and Brewster, Bull. Nutt. Orn. Club, 

 viii, 1883, 160 (Colorado Springs, Colorado).— Seton, Auk, iii, 1886, 325 (w. 

 Manitoba). — Allen, Bull. Am. Mus. N. H., v, 1893, 40 (n. e. Sonora and 

 n. w. Chihuahua, Sept., Feb.). 



C\_ollurio\ l[;udovicianus] excubitorides Coves, Key N. Am. Birds, 2ded., 1884, 338. 



Lanius ludovicianus (not of Linnaeus) Henry, Proc. Ac. Nat. Sci. Phila., 1855, 

 312 (New Mexico).— Maximilian, Journ. fiir Orn. 1858, 191 (Upper Mis- 

 souri E,. ). — Dresser and Sharpe, Proc. Zool. Soc. Lond., 1870, 595, part 

 (crit.). — Salvin and Godman, Biol. Centr.-Am. Aves, i, 1883, 213, part. — 

 Gadow, Cat. Birds Brit. Mus., viii, 1883, 245, part (Jalapa, Vera Cruz; 

 Mexico) . 



Collyrio ludovicianus (not of Baird) Henry, Proc. Ac. Nat. Sci. Phila., 1859, 106, 

 (New Mexico). — Dresser, Ibis, 1865, 480 (San Antonio, Texas, sum. resid.). 



LANIUS LUDOVICIANUS MEXICANUS (Brehm.) 

 MEXICAN SHRIKE, 



Similar in coloration to Z. I. ludoincianus^ but the deep slate-graj'' 

 of upper parts giving way abruptly to white or gra3'i.sh white" on 

 upper tail-coverts; outermost rectrices with much less white, the inner 

 web of outermost with more than middle third black; grayish white 

 edging to inner webs of remiges broader, more distinct; bill decidedly 

 smaller. Young decidedly darker than that of L. I. ludovicianus or 

 any other of the conspecific forms, with chest and sides more denselv 

 vermiculated on a more decidedl}' grayish ground color. 



Adult wa^g.— Length (skins), 203-216 (206.2); wing, 96-106 (101.1); 

 tail, 96-107 (100.3); exposed culmen, 1-1-16.5 (14.8); tarsus, 26-28 

 (27.1); middle toe, 16-17 (16.4).^^ 



« In females the color is more gray than in males, but it is always conspicuously 

 and abruptly different from that of the rump. 

 & Eight specimens. 



