Appendix, 



spots on inner webs, the latter white or bufF 

 tipped and barred. A rather rare species, 

 breeding in both the Coast Range and Sierra 

 Nevada Mountains, and south in winter through 

 the valleys. 



27. Duck- Hawk ; Falco peregrinus ana turn 

 (Bonap. ). 



Size about as in preceding. Adult, above dark 

 bluish gray in color, the feathers more or less 

 spotted or barred with a darker shade. Under 

 parts white or bufFy, the breast with few or no 

 markings, the sides and belly with blackish 

 brown bars. Tail bluish gray, closely barred 

 with black. Inner webs of wing-quills spotted 

 with white. Immature birds are dark brown 

 above, the feathers edged with light buff, and 

 white or bufFy below, streaked or spotted with 

 dark brown. The broad blackish streak below 

 eye, forming a border to the white throat, is a 

 characteristic mark in both plumages. Irregu- 

 larly distributed in California, occurring upon 

 the islands of the southern coast and at various 

 points in the interior; breeding in the mountains. 



28. Pigeon-Hawk; Falco columbarius \Ann. 



Size small (length eleven inches). Upper parts of 

 male bluish gray or slaty, varied with fine black 

 lines. Tail slate, with three broad bands of 

 black, and a white tip. Wing-quills dark and 

 with numerous large white spots on inner webs. 

 Under parts white, becoming bufFy on breast 

 and streaked with dark brown lines. The fe- 

 male has the bluish gray color o^ the back re 



280 



