502 BULLETIN 50, UNITED STATES NATIONAL MUSEUM, 



ff. Breast not spotted. 



g. Posterior under parts dull fulvous, unbarred; chest more or less 



mottled or clouded with dusky.. Heleodytes zonatus, young (p. 510) 



(j(j. Posterior under parts pale dull buffy, 1)roadly l)arred with dusky; 



<'hest immaculate Heleodytes megalopterus, young (p. 514) 



dd. Pileum brown or gray, the feathers with more or less distinct dueky 

 centers. 

 e. Back banded or broadly barred with black and dull white or pale fulvous. 

 /. Posterior under parts tawny-buff or tawny-ochraceous. {Heleodytes 

 zonatus, adults. ) 

 (J. Posterior under parts little, if at all, spotted or barred with black, 

 usually immacnlate (except under tail-coverts). 

 h. Larger; adultmaleaveraging, wing 83.1, tail 86.2, tarsus 26.3; adult 

 female, wing 80.7, tail 82.9, tarsus 25.9. (Southeastern Mexico to 



Honduras.) Heleodytes zonatus zonatus, adults (p. 510) 



hh. Smaller; adult male averaging, wing 76, tail 72.2, tarsus 23.7; adult 

 female, wing 69.5, tail 64.8, tarsus 21.8. (Costa Rica.) 



Heleodytes zonatus costaricensis, adults (p. 512) 

 gg. Posterior under jiarts conspicuously banded or spotted with black. 

 (State of Tabasco, and adjoining parts of Oaxaca, southeastern 

 Mexico; northeastern Gautemala. 



Heleodytes zonatus restrictus, adults (p. 512) 

 ff. Posterior under parts dull whitish, like anterior portions. 



g. Larger, darker, and less tinged with brown; bands on back, etc., 

 nearly pure white; spots on under parts nearly black; adult male 

 averaging, wing 91.4, tail 84.5, exposed culmen 22.2, tarsus 27.5; 

 adult female, wing 85.9, tail 78.9, exposed culmen 18.7, tarsus 26.7. 

 (Southwestern portion of Mexican plateau.) 



Heleodytes megalopterus, adults (p. 513) 

 gg. Smaller, paler, and more brownish; bands on back, etc., dull brown- 

 ish white or pale brownish buff; spots on under parts grayish 

 brown; adult male averaging, wing 88.6, tail 73.6, tarsus 27.3; 

 adult female, wing 86.5, tail 75.5. (Southeastern portion of 



Mexican plateau. ) Heleodytes nelsoni, adults (p. 514) 



ee. Back streaked or spotted with whitish, the marking always more or less 

 longitudinal, never regularly transverse. 

 /. Throat streaked or spotted with blackish; back streaked or striped with 

 white, the white streaks margined on each side by black. 

 g. Pileum grayish brown or brownish gray (centers of feathers dis- 

 tinctly dusky); imder tail-coverts and flanks barred with black. 



(Yucatan.) Heleodytes guttatus, adults (p. 516) 



gg. Pileum sepia to chestnut-brown, the centers of feathers indistinctly 

 dusky; flanks and under tail-coverts with roundish or cordate 

 spots of blackish. {Heleodytes bninneicapUlus.) 

 h. Tail more extensively banded, the lateral rectrices usually with 

 white bands on whole of inner web; brown of iiileum more 

 rufescent; back usually broadly and conspicuously streaked with 

 white. 

 i. Posterior under parts deep cinnamon-buff; bill and feet smaller 

 (adult male averaging, wing 84.3, tail 78.9, exposed culmen 

 , 21.4, tarsus 27.5; adult female, wing 80.3, tail 75.4, exposed 

 culmen 20.1, tarsus 26.3). (Southern Sonora. ) 



Heleodytes brunneicapillus brunneicapillus (p. 517) 

 it. Posterior under parts faintly tinged with buff; bill and feet 

 larger. 



