618 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



and under parts white, the latter tinged with gray (especiallj- on sides 

 of neck and breast), becoming pale brownish on iianks. 



Widificatimi. — Unknown . 



Range. — Southern Mexico (including Yucatan) and adjacent parts 

 of Guatemala. (Monotypic.) 



KEY TO THE SUBSPECIES OF NANNOECHILUS LEUCOGASTER. 



a. Tail indistinctly barred; under tail-coverts pale brown, spotted, not barred with 

 darker brown, or else the bars grayish brown, not blackish. 

 h. Paler and more rufescent, the upper parts isabella color to brownish cinnamon. 



(Southwestern Mexico.) Nannorchilus leucogaster paciflcus (p. 619) 



66. Darker, the upper parts deep russet-brown. (Chiapas and Tabasco to eastern 



Guatemala. ) Nannorcliiltis lencogaster musicTis (p. 620) 



Intermediate in color between 6 and 66. (Southern Tamaulipas to Oaxaca. ) 



Nannorchilus lencogaster lencogaster (p. 618) 



aa. Tail distinctly barred with dusky; under tail-coverts whitish barred with dusky. 



(Yucatan and Campeche. ) Nannorchilus lencogaster bracliynrns (p. 620) 



NANNORCHILUS LEUCOGASTER LEUCOGASTER (Gould). 

 GOTJID'S WREN. 



Adults in spring and summer. — Above plain buffy grayish brown 

 (between broccoli brown and dark isabella color), the rectrices and 

 secondaries narrowly and very indistinctly barred with darBer; outer- 

 most primaries edged with pale buffy gray or grayish buffy, a broad 

 and conspicuous superciliaiy stripe of white; a rather broad postocu- 

 lar streak of brown, involving more or less of upper portion of auric- 

 ular region; suborbital and auricular regions (except upper margin of 

 latter) grayish white, the feathers very narrowly and rather indistinctly 

 margined or edged with grayish brown; malar region, chin, throat, 

 chest, breast, and abdomen grayish white, the throat and abdomen 

 nearly pure white, the chest (especially laterally) faintly shaded with 

 pale gray; sides and flanks pale buffy brown or isabella color; under 

 tail-coverts similar but paler, tipped with whitish or very pale grayish 

 buffy, and marked with a subterminal spot or bar of deeper isabella 

 color; axillars and under wing-coverts dull white, tinged with grayish 

 buffy; inner webs of remiges edged (not sharply) with pale dull buffy; 

 maxilla horn color, with paler tomia; mandible pale brownish or dull 

 pale yellowish (in dried skina); legs and feet pale horn color (in dried 

 skins). 



Adults in autumn and winter. — Similar to the spring and summer 

 plumage, but color of upper parts decidedly browner (cinnamon-brown 

 or between russet and raw-umber). 



Young. — Similar in coloration to adults, but flanks much paler (dull 

 buffy whitish or very pale brownish buffy), and under tail-coverts 

 immaculate pale buffy brown or isabella color. 



