466 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



Oaxaca (Tehutotepec; Santa Efig^nia; CuicatUn; Chihuitdn; Barrio; 

 Tapana; Los Cu6s; Putla; Rio Grande; Sola; Lucapa; Golto; Tapanfi,- 

 tepec) and Chiapas (Tonali; San Vicente; San Bartolom^). 



Momotus mexkanus (not of Swainson) Solatbe, Proc. Zool. Soc. Lond., 1859, 387 

 (Rio Grande, Oaxaca); Cat. Am. Birds, 1862, 262, part.— Lawrence, Bull. 

 U. S. Nat. Mus., no. 4, 1876, 29 (Chihuitan, Barrio, Santa Efigenia, and Loa 

 Cues, Oaxaca). — Salvin, Proc. Zool. Soc. Lond., 1883, 426 (Acapulco, 

 Guerrero). — Sharpb, Cat. Birds Brit. Mus., xvii, 1892, 328, part (Rio Grande, 

 Tehuantepec, and Sola, Oaxaca; Rincon, Amula, Chilpancingo, and Aca- 

 pulco, Guerrero; Tonala, Chiapas). — Salvin and Godman, Biol. Centr.-Am., 

 Aves, ii, 1895, 460, part (Amula, etc., Guerrero; Lucapa, Golan, Cuicatlan, 

 Chihuitan, Tapanatepec, etc., Oaxaca; Tonala, Chiapas). 



[Momotus] mexicanw Gray, Hand-list, i, 1869, 80, no. 938, part. — Sclateu and 

 Salvin, Nom. Av. Neotr., 1873, 102, part. 



Mlomotus] mexicanus Ridgwat, Man. N. Am. Birds, 1887, 278, part. 



Momotus mexkanus saturatus Nelson, Auk, xiv, no. 1, Jan., 1897, 49 (Tehuan- 

 tepec City, Oaxaca; coll. U. S. Nat. Mus.). 



[Momotus'] saturatus Sharpe, Hand-list, ii, 1900, 77. 



MOMOTUS CASTANEICEPS Gould. 



CHESTNUT-HEADED MOTMOT. 



Similar to M. mexicanus saturatus but color of pileum much 

 darker (bright chestnut), lores wholly uniform black, black suborbital 

 area margined beneath by greenish white instead of blue, and size 

 averaging larger. 



Adult male. — Whole pileum deep chestnut, passing, somewhat 

 abruptly, into chestnut-tawny on hindneck; back, scapulars, rump, 

 and wing-coverts plain gra3dsh green (bice green to dull oil-green); 

 alula, primary coverts, remiges, upper tail-coverts, and tail more 

 bluish green (nearly beryl green), the primaries and distal portion of 

 rectrices somewhat bluer; shafts of rectrices black, the expanded tip 

 of middle pair of rectrices very broadly tipped with black; loral, 

 suborbital, and auricular regions black, the last partly light blue on 

 upper-distal portion; chin greenish white or dull yellowish white, 

 this extending across anterior portion of malar region to lower mar- 

 gin of the black suborbital area; rest of under parts pale grayish 

 green, deeper (approaching chromium green) and somewhat suffused 

 (especially beneath surface) with pale tawny or tawny buff on chestj 

 passing into whitish on hinder flanks, anal region, and under tail- 

 coverts; middle upper chest with a conspicuous tuft of elongated 

 narrow black feathers, some of which are edged with light bluish 

 green anteriorly; under wing-coverts pale dull pinkish buff, passing 

 into pale greenish along margin of wing; biU and feet black; iris red;' 

 length (skins), 351-375 (364); wing, 129-134 (131.2); exposed cul- 

 men, 39.5-41.5 (40.7); tarsus, 26-28 (27); middle toe, 19.5-20 (19.8).' 



o According to N. Dearborn. b Three specimens. 



