ORDER RAP TORES. 25 



chrysaetos. Begin laying about the middle of March. Nest usually on high 

 trees along the banks of streams, but occasionally, where trees are not conven- 

 ient, build on high, rocky cliffs, a huge platform structure made of large 

 sticks and lined with twigs, grasses, and a few feathers. Eggs, two to four; 

 average measurements as given by others, about 2.90x2.50; but two that I col- 

 lected at Neah Bay, Washington Territory, only measure 2.50x1.95, 2.60x2.00; 

 dull white, unmarked; in form rounded oval. 



SUBFAMILY FALCONIN/E. FALCONS. 



GENUS FALCO LINN.EUS. 

 SUBGENUS HIEROFALCO CUVIER. 



B. 12. R. 412o. C. 500. G. 190. U. 354. 



130. Falco rusticolus LINN. Gray Gyrfalcon. Accidental winter visitant; cap- 

 tured near Manhattan December 1st, 1880, by A. L. Runyan, and reported to 

 me by Dr. C. P. Blachly, who has the bird (a fine specimen) in his collection. 



B. 10. R. 413. C. 502. G. 191. U. 355. 



131. Falco mexicanus SCHLEG. Prairie Falcon. Resident; rare. Nest usually 



on the side of steep, rocky cliffs, made rudely of sticks and lined with grasses. 

 Eggs are said to be two to four. In Capt. B. F. Goss's collection are two eggs 

 taken April 28th, 1880, at Marysville, Mo., from a tree thirty-five feet from the 

 ground; notes fail to show whether the nest was in the forks of branches or 

 in a hole of the tree, but doubtless in the latter, as the habits of the birds are 

 similar to Falco peregrinus anatum; dimensions of the eggs, 2.05x1.70, 2.12x1.65; 

 grayish white, spotted and blotched with various shades of reddish brown run- 

 ning together so as to obscure the ground color of one of the eggs, and par- 

 tially of the other; in form rounded oval. 



SUBGENUS RHYNCHODON NITZSCH.. 



B. 5, 6. R. 414. C. 503. G. 192. U. 356. 



132. Falco peregrinus anatum (BONAP.). Duck Hawk. Resident; not uncom- 

 mon. Begin laying early in March. Nest in natural cavities in trees and on 

 the sides of rocky cliffs, without lining. Eggs, three or four; 2.25x1.70; gray- 

 ish ochre, spotted and blotched with reddish and dark chocolate brown, running 

 somewhat together, thickest about large end; in form subspherical to rounded 

 oval. 



SUBGENUS JESALON KAUP. 



B. 7. R, 417. C. 505. G. 193. U. 357. 



133. Falco columbarius LINN. Pigeon Hawk. Migratory; rare. 



B. . R. 418. C. 507. G. 194. U. 358. 



134. Falco richardsonii RIDGW. Richardson's Merlin. A rare visitant in east- 

 ern, not uncommon in western Kansas. 



SUBGENUS TINNUNCULUS VIEILLOT. 



B. 13. R. 420, 420a. C. 508, 509. G. 195. U. 360. 



135. Falco sparverius LINN. American Sparrow Hawk. Resident; abundant. 

 Begin laying the first of April. Nest in large woodpecker holes and natural 



