74 JProceedin gs of the 



on one occasion from the carcass of a prairie-dog- which 

 I had left in the field after skinning it. This hawk was 

 noticed by\ M. H. Swenk on October 28, 1910. 



39. Accipiter velox (Wilson) — Sharp-shinned Hawk. 



September 1, 1911, I secured a female hawk of this 

 species which I had noted the day before for the first 

 time in the region. September 1, 1912, exactly a year 

 later, I saw a pair in almost the identical place. Prob- 

 ably the Sharp-shinned Hawk is a regular migrant at 

 Halsey. 



40. Bnteo swainsoni Bonaparte — Swainson Hawk. 



Very frequently during the summer of 1912 I noted a 

 pair of Swainson Hawks near the Reserve, usually high 

 in the air, circling about over the hills. On June H) I 

 discovered the nest in a hackberry tree which formed one 

 of a group of such trees in a hollow about two miles back 

 from the Loup river. The nest was a bulky structure 

 about a yard in diameter and fully as much in height, two 

 feet across the interior and about a foot in depth, and 

 was constructed of sticks and lined with grass and root- 

 lets. Its height from the ground was not over twelve 

 feet. It contained three heavilj^ incubated eggs, almost 

 pure Avhite in color but lightly tinged with pale green 

 and faintly blotched with brown. 



41. Archihutco fcrrngineiis ( Lichtenstein ) — Ferruginous 



Rough-leg. 

 This hawk was noted in 1911 on several occasions from 

 August 26 to September 21, but in 1912 I saw it only on 

 May 19. Apparently there were no breeding birds near the 

 Reserve during my observations, but R. H. Wolcott records 

 a nest of the species from the region. 



42. Falco mexicanus Schlegel — Prairie Falcon 



On August 8, 1911, I saAV a single Prairie Falcon in the 

 valley near the Reserve station, the only time that I have 

 seen the species in the sandhills. Without doubt it was 

 a migrating bird. 



43. Falco coliimharius Linnaeus — Pigeon Hawk. 



A single Pigeon Hawk was seen between Halsey and 

 the Reserve station on September 3, 1911. It was in com- 

 pany with several Sparrow Hawks but did not seem to be 



