48 FALCONID. 
pallidior, indistincte albo fasciatus; tectricibus subcaudalibus albis; tibiis saturate rufis ; tectricibus 
subalaribus albis, remigibus fuscis albo punctatis; cauda nigricante, griseo trifasciata : rostro nigricante, 
cera et pedibus flavis. Long. tota circa 15:5, ale 8-3, caude 6°7, tarsi 2:5. (Descr. maris ex Savana 
Grande, Guatemala. Mus. nostr.) 
2 mari similis, sed major. 
3 juv. Supra fuscus, plumis omnibus rufo marginatis, capite summo nigro, torque cervicali et corpore toto subtus 
isabellinis ; superciliis albis, nigro striatis ; auricularibus fuscis, nigro striatis ; tibiis pallide rufis; cauda 
nigricante, albido trifasciata et albo terminata. (Descr. maris juv. ex Choctum, Guatemala. Mus. nostr.) 
Hab. Mexico, Vera Cruz ( fide Cabanis 12), Potrero (Sumichrast"), Jalapa (de Oca), Playa 
Vicente (Boucard 13), Tehuantepec (Sumichrast"), Merida in Yucatan, Tizimin 
Yok-Satz §, Peto (@. F. Gawmer) ; GuateMaLa, Savana Grande, Duefias, Vera Paz 14, © 
Cubilguitz (0. 8S. & F. D. G.); Honpuras, Tegucigalpa (W. B. Richardson), San 
Pedro (G. M. Whitely*); Nicaragua, San Emilio, Rio Coco, Ojoche, Matagalpa 
(W. B. Richardson) ; Costa Rica (Hoffmann ”, v. Frantzius™), Miravalles (Under- 
wood), Turrialba (Arcé, Cooper 1°), San José (Carmiol 1°, Zeledon ®, Cherrie 1°), Dota 
(Carmiol 1°); Panama, Volcan de Chiriqui, Chitra, Boquete de Chitra, Calovevora 
(Arcé*°), Line of Railway (1/‘Leannan *).—Sovutn America, northern portion from 
Colombia to Guiana ? °, 
Accipiter bicolor is a northern form of the Brazilian A. pileatus, from which the 
adult bird differs in having the under wing-coverts white instead of chestnut, while 
the immature differs in the under surface being plain instead of freely marked with 
conspicuous spots. From other allied forms, such as A. chilensis and A. guttatus, 
the adult can be recognized by its nearly uniform slate-coloured under surface. All 
these forms, except A. pileatus, are figured in ‘ Exotic Ornithology,’ and their distinctive 
characters shown. 
From the northern A. cooperi, a bird equalling A. bicolor in size, the differences are 
more pronounced. Rufous enters largely into the colour of the under surface of the 
adult of the former bird, and the young is freely marked beneath with tear-shaped spots. 
Accipiter bicolor is found over a large area in Mexico and Central America, extending 
from the middle of the State of Vera Cruz over the rest of the tropical and hotter parts 
of South-eastern Mexico, but, as yet, we have no record of its occurrence in the west. 
It is found in Yucatan and throughout Eastern Guatemala, and also on the Pacific 
slope of the mountains up to an elevation of 5000 feet. It passes thence southwards 
to the Isthmus of Panama, and to the northerm parts of South America, being found in 
Colombia, where Salmon met with it, and Guiana, whence Vieillot’s types came and 
where Whitely secured several specimens. 
~ 8. Accipiter velox. 
Faico velox, Wils. Am. Orn. v. p. 116, t. 45. f.11; Licht. Preis. Verz. Mex. Vog. p. 8 (cf. J. f. Orn. 
1863, p. 58) ?. 
Accipiter velox, Vigors, Check-list N. Am. Birds, ed. 2, p. 128°; Ferrari-Perez, Pr. U. S. Nat. 
Mus. ix. p. 168°; Herrera, La Nat. (2) i. pp. 176, 320°; Cherrie, Auk, 1892, p. 328°; 
