Henninger-Jones — On Falcones of North America. 85 



FALCO COFUMEARIUS (Linn). 

 Pigeon Hawk. 

 Under this chapter are three races which have been given 

 recognition. The extreme northwestern form, which is the 

 darkest one is F. c. sucklcyi (Ridg-a'ay) Black MerHn ; the 

 eastern form is typical columharius, Pigeon Hawk, and is the 

 median form, while the form occupying the middle western 

 parts of the country, but ranging to the Pacific coast is F. c. 

 richardsonii (Ridgway), Richardson's Merlin, it being the 

 lightest, in conformance to its more desert habitat. 



Geographical Distribution. 



Pigeon Hawk, occupies the whole of the eastern part of 

 North America east of the Rocky Mountains, breeding chief- 

 ly north of the United States, wintering south to northern 

 South America : less common west of the mountains. 



Black Merlin, is confined to the Pacific Coast region from 

 northern California to Sitka, Alaska, ranging eastward in 

 Washington and Oregon. 



Richardson's Merlin, occupies the interior of North Amer- 

 ica, from the Mississippi River westward to the Pacific Coast, 

 from the Saskatchewan region to Texas. Arizona, and Mexico. 



Measurements. 



Pigeon Hawk: Male; length 27.24, wing 17.80, tail 13.11, 

 culmen 1.24, tarsus 3.43, middle toe 3.05. 



Female: Length 31.81, wing 21.59, tail 13.72, culmen 145. 

 tarsus 4.01, middle toe 3.42. 



Black Merlin: Male; wing 19.76, tail 13.46, culmen 1.57, 

 tarsus 3.30, (Mrs. Eckstonn). 



Female: Wing 21.25, tail 14.60, culmen 1.47, tarsus 3.94, 

 middle toe 3.50, (Ridgzvay). 



Richardson's Merlin : Male ; length 27.94. wing 20.24, tail 

 12.95, culmen 1.40, tarsus 3.76, middle toe 3.20. 



Female; length 32.51. wing 22.73, tail 15.27, culmen 1.45, 

 tarsus 3.15. middle toe 3.10. 



