116 



BULLETIN 5 0, UNITED STATES NATIONAL MUSEUM 



cc. Breast and abdomen white, streaked with fuscous-brown or fuscous-black. 



d. Thighs ruf escent H. diodon young (extraliniital) 



dd. Thighs whitish. 



e. Streaks narrow and confined to breast and upper abdomen; upper- 

 parts blackish H. bidenta,tus bidentatus young (extraliniital) 



«e. Streaks broad and extending over whole underparts down to flanks; 

 uppcrparts brownish (southern Mexico to Panama). 



H. bidentatus fasciatus young (p. 116) 



HARPAGUS BIDENTATUS FASCIATUS Lawrence 



Banded DotrBLE-TOOTHED Hawk 



Adult male. — Top and sides of head blackish plumbeous; back, 

 scapulars, interscapulars, and lesser and median upper wing coverts, 

 rump, and upper tail coverts blackish plumbeous to blackish slate 

 becoming washed with olive brown on the lower back and rump and 



Figure 10. — Harpagus bidentatus. 



with fuscous on the outer greater upper wing coverts; the remiges 

 obscurely banded (above) fuscous-black and clove brown, fuscous- 

 black and white (on under surface) ; rectrices fuscous-black tipped 

 with grayish white, often with a hair brown wash on the terminal 

 band, and crosscd.':by three narrow bars of the same color, the bars 

 equally spaced, dividing the rectrices into approximately equal 

 fourths; on the underside the rectrices are broadly barred fuscous- 

 black and whitish, the light bars about the same width as the dark 

 ones; chin and middle of throat creamy white with a blackish plumbe- 

 ous line down the midline of the throat ; sides of throat blackish plumbe- 

 ous; middle of breast, all of abdomen, sides, flanks, and thighs uni- 

 formly barred deep mouse gray and whitish, the bars all of about the 



