116 FALCONIDZ, 
albidis ; facie laterali alba, nigro lineata, regione parotica rufescenti-brunnea ; genis rufescentibus nigro 
striolatis, fasciam Jatam mystacalem formantibus; genis anticis et corpore subtus toto albis, gutture 
immaculato; gastreo reliquo maculis longitudinalibus vel cordiformibus notato, hypochondriis tibiisque 
fere omnino brunneis, rufo notatis et albo fasciatis; subcaudalibus albis, fere immaculatis ; subalaribus 
albis, nigricanti-brunneo maculatis, tectricibus majoribus brunneis, albo maculatis ; remigibus inira 
griseo-brunneis, intus late albo fasciatis: rostro cyanescenti-albo, apicem nigram versus magis cyanescente ; 
eera et area orbitali nuda viridescenti-albis; pedibus pallide flavis, vix viridi tinctis; iride saturate 
brunnea. Long. tota circa 21-0, ale 14-0, caude 8:1, culm. 1:2, tarsi 2-4. (Descr. feminee ex Hermosillo, 
Sonora. Mus. nostr.) 
Juv. adultis similis, sed notei plumis rufo distincte marginatis; fascia albida latiore: subtus albus, ochraceo 
tinctus, vbique nigro guttulatim notato; hypochondriis nigricantibus, albido variegatis. Long. tota circa 
18-0, ale 13-5. (Descr. maris ex Bidwell, California. Mus. nostr.) 
Hab. Norrn America, United States, from the eastern border of the plains to the 
Pacific, from the Dakotas southward, casual eastward to Illinois—Mexico 
(Deppe?), Hermosillo in Sonora (Ferrari-Perez), Zacatecas, Aguas Calientes 
(Richardson). 
The Prairie-Falcon, an inhabitant of the plains of the United States, also occurs in 
Mexico. We have received examples from Hermosillo, in Sonora, from Mr. Ferrari- 
Perez, and Mr. Richardson has forwarded others from Aguas Calientes and Zacatecas, 
the latter obtained in August. As our other Mexican specimens were procured from 
September to March, the species must either be resident or a very early migrant in 
that country. 
The nest, according to Bendire*, shows but little attempt at construction, and the 
eyries generally selected are on the inaccessible ledges or in cavities of perpendicular 
cliffs; he records a clutch of five eggs taken by Mr. Bryant at Pine Cafion near Mount 
Diablo, California, which were laid in a cleft about four feet deep with only a layer of 
ejected fur and feathers. In many parts of North America the species is comparatively 
common. 
The bird frequently perches on a dead cotton-wood tree, from which it observes and 
pounces on its prey. The food consists chiefly of Meadow-Larks, Doves, and other birds, 
and various small rodents. . 
The eggs vary from three to five in number and are paler than those of the Peregrines 
or Gyr-Falcons; they are creamy-white, with rufous or brown mottlings usually 
distributed over the whole surface. 
3. Falco rufigularis. | 
Falco rufigularis, Daud. Traité, u. p. 181°; Salv. Cat. Strickl. Coll. p. 501°; Chapman, Bull. 
Amer. Mus. vil. p. 286°. 
Hypotriorchis rufigularis, Gray, Scl. P. Z. 8. 1859, p. 390*; Scl. & Salv. Ibis, 1859, p. 219°; 
P. Z. S. 1870, p. 838°; Lawr. Ann. Lyc. N. Y. vii. p. 4627; Mem. Bost. Soc. N. H. ii. 
p- 801°; Salv. P. Z. 8. 1867, p.158°; 1870, p. 215°; Ibis, 1869, p.319”; 1889, p. 3875"; 
Grayson, Pr. Bost. Soc. N. H. xiv. p. 269; Boucard, P. Z. S. 1883, p. 457. 
Falco albigularis, Daud. Traité, ii. p.181”; Sharpe, Cat. Birds Brit. Mus. i. p. 401°; Sumichrast, 
La Nat. v. p. 237"; Zeledon, An. Mus. Nac. Costa Rica, 1887, p. 125°; Ridgw. Pr. U.S. 
