248 BULLETIN 50, UNITED STATES NATION AL MUSEUM. 



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

 xli, 1902, 172 (Trinnfo, Lower California, Dec.)-— Belding, Proc. "U. S.Nat. 

 Mus., V, 1883, 537 (La Paz, Lower California, winter). — Amemcan Orkitholo- 

 GisTs' Union, Check List, 1886, no. 622o, part. — Ferkaki-Peeez, 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 CatalinaMts., etc., Arizona). — Beckham, Proc. IT. 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).— JouY, Proc. U. S. Nat. Mus., xvi, 1894, 778 (Soledad, 

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

 ( 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. 



Llanius} ludovieianus excubitorides Eidgway, Man. N. Am. Birds, 1887, 467, part. 



Lanius ludomcianus excubitoroides Drew, 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. Mua. N. H., v, 1893, 40 (n. e. Sonora and 

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



C[ollurio] lludomdanus] excubiiorides Coves, Key N. Am. Birds, 2ded., 1884, 338. 



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

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

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

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

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

 Mexico) . 



Collyrio ludomcianus (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 SEKIKE, 



Similar in coloration to L. I. ludovieianus, but the deep slate-gray 

 of upper parts giving way abruptly to white or grayish 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. ludovicianm or 

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

 vermiculated on a more decidedly grayish ground color. 



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

 tail, 96-107 (100.3); exposed culmen, 11-16.5 (li.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. 

 6 Eight specimens. 



