618 BULLETIN 5 0, UNITED STATES NATIONAL MUSEUM 



ee. Upperparts with slate or bluish slate margins to the feathers; under 

 tail coverts with no black marks. 

 /. Upperparts plumbeous slate (Sonora and Sinaloa). 



F. albigularis petrophilus, ad. (p. 681) 

 //• Upperparts plumbeous black (all but northwest Mexico south to 



Argentina) F. albigularis albigularis, ad. (p. 674) 



dd. Tarsus shorter than middle toe without claw. 



e. Breast with no black streaks (southern Me.xico to Argentina). 



F. deiroleucus, ad. (p. 671) 

 ee. Breast with blackish streaks (southern Mexico to Argentina). 



F. deiroleucus, juv. (p. 672) 

 cc. Tip of tail distinctly rounded; tarsus with more than one-third of anterior 

 portion feathered. 

 d. Underparts of body streaked. 



e. Ventral streaks very dark, dark mummy brown to dark fuscous. 

 /. The dark marks restricted to very broad shaft streaks, the ventral 

 feathers very broadly margined with pale oehraceous-buff (North 



America generally) F. peregrinus anatum, juv. (p. 651) 



//. The dark marks occupying almost the entire vane of each ventral 

 feather, the feathers narrowly edged with buffy white (Aleutian 

 and Queen Charlotte Islands) .F. peregrinus pealei, juv. (p. 667) 

 ee. Ventral streaks paler dark wood brown to sepia. 



/. The dark malar stripe usually narrow and pointed terminally 

 (eastern Siberia; accidental in Alaska). 



F. peregrinus harterti, juv. (p. 665) 

 //. The dark malar stripe usually broad and roundly truncate termi- 

 nally F. peregrinus peregrinus, juv. (extrahmital) " 



dd. Underparts of body not streaked. 



e. Top of head darker, more blackish, than the back. 

 /. Size larger; wing, male over 330 mm, female over 370 mm, (North 



America generally) F. peregrinus anatum, ad. (p. 650) 



//. Size smaller; wing, male under 325 mm; female under 370 mm. 

 g. Malar stripe very narrow; underparts tinged with buflfy (e. 

 Siberia; accidental in Alaska). 



F. peregrinus harterti, ad. (p. 665) 

 gg. Malar stripe fairly broad; underparts whitish. 



F. peregrinus peregrinus, ad. (extralimital) 

 ee. Top of head like the back (Aleutian and Queen Charlotte Islands) . 



F. peregrinus pealei, ad. (p. 667) 



aa. Unfeathered portion of tarsus covered with larger scales, the larger ones 



arranged in one or more definite rows or longitudinal series. 



b. Inner toe v.'ithout claw falling short of penultimate articulation of middle toe. 



c. Length of cere on top equal to more than one-third of the length (curve) 



of culmen; a broad dark grayish or blackish area on sides of breast, 



flanks, and abdomen, meeting narrowly across upper abdomen. 



"Falco Peregrinus Tunstall, Orn. Brit., 1771, 1. — Falco peregrinus peregrinus 

 Peters, Check-list Birds of World, i, 1931, 288. — Falco barbarus subsp. germanicus 

 Erlanger, Journ. fiir Orn., li, 1903, 294. — Falco peregrinus briUanicus Erlanger, 

 Journ. fiir Orn., li, 1903, 296. — Falco peregrinus rhenanus Kleinschmidt, Berajah, 

 1912, pi. 9. — Falco peregrinus scandinaviae Kleinschmidt, Berajah, 1918, pi. 33, 

 p. 46. 



