BrTEO. 65 



6. Buteo fumosus. 



Buteo borealis, var. muntanus (nee Nult.), Grayson, Proc. Bost. Soc. N. H. xiv. p. 268 \ 



Buteo borealis, var. costaricensis (part., nee Ridgw.), Ridgw. in Baird, Brewer, & Ridgw. N. Amer. 



Birds, iii. p. 285 \ 

 Buteo borealis, var. calurus, part., Lawr. Mem. Bost. Soc. N. H. ii. p. 301 (1874) '. 

 Buteo borealis fumosus, Nelson, Proc. Biol. Soc. Wash. xii. p. 7*; N. Amer. Fauna, no. 14, p. 37 '. 

 Buteo fumosus, Sharpe, Hand-1. Birds, i. p. 256 (1899) °. 



Supra brunneo-fuscus : subtus albus, tindiqiie griseo-fuseo et ferrugineo variegatus ; tibiis albis, distincte efc 

 regiilariter griseo-fusco trausfasciatis, rbachidibus fuscis ; cauda fusca, pallide fusco frequenter trans- 

 fasciata. Long, tota circa 190, alse 14-2, caudae 8-5. (Descr. maris vix ad. ex Tres Marias Is., W. Mexico. 

 Mus. nostr.) 



Hob. Mexico, Tres Marias Is. {Orayson^^^, Forrer, Nelson, & Goldman^). 



This seems to be a distinct species, to judge from the single immature bird before 

 us. No specimens of any of the continental forms are so strongly marked beneath, 

 and the pattern of the thigh-feathers is very pronounced and peculiar. Mr. Nelson* 

 describes the adult as foUovv^s : — 



" Entire bead and neck nearly uniform smoky brown, vpitb scarcely a trace of lighter 

 markings on throat or chin. Back and vpings blackish brovm ; breast and remainder 

 of lower surface, except neck, heavily marked with dull rusty, smoky brown, and dull 

 whitish or buffy ; no sign of lighter area on breast ; the markings on ventral surface 

 are in the form of indistinct barrings, which are most clearly defined on the tibia. 

 Dimensions of type: wing 375 millim. ; tail 206 ; culmen 26 ; tarsus 81. 



" The Tres Marias form is darker and more uniformly marked below, and lacks the 

 lighter area on the throat and breast that are found in B. borealis socorroensis ; on the 

 dorsal surface JB. fumosus is readily distinguishable from £. socorroensis by the 

 uniformly smoky brown head and neck, the rusty edgings to the neck and wing-feathers 

 being entirely absent." 



Mr. Nelson states that this Buzzard is very sparsely distributed. Two or three were 

 seen on Maria Magdalena and none on Maria Cleofa ^. 



Grayson ^ states that the species subsists almost entirely on the Iguana lizard and 

 rabbits, which are very numerous. 



7. Buteo harlani. 



Falco harlani, Audub. Orn. Biogr. i. p. 441, t. 86 \ 



Buteo harlani, Bp. Comp. List Birds Eur. & N. Amer. p. 3'; Scl. P. Z. S. 1857, p. 211'; 1859, 



p. 389 * ; Dresser, Ibis, 1865, p. 334 ' ; Coues, Birds N.-West, p. 352 ' ; Ridgw. in Baird, 



Brewer, & Ridgw. N. Amer. Birds, iii. p. 292 '; Sharpe, Cat. Birds Brit. Mus. i. p. 191 (pt.) ° ; 



Gurney, Ibis, 1876, p. 240 \ 

 Buteo borealis harlani, Bendire, Life Hist. N. Amer. Birds, i. p. 217 "; Fisher, Bull. U. S. Dept. 



Agric. no. 3, p. 53 " ; A. O. U. Check-1. N. Am. Birds, 2nd ed. p. 131 ". 

 Fuliginoso-niger, capitis et cervieis plumis ad basin albis : subtus albo indistincte variegatus, tibiis vix fasciatis ; 



BIOL. CBNTK.-AMBK., Aves, Vol. III., November 1900. 9 



