BUTEO. 65 
6. Buteo fumosus. 
Buteo borealis, var. montanus (nec Nutt.), Grayson, Proc. Bost. Soc. N. H. xiv. p. 268". 
Buieo borealis, var. costaricensis (part., nec Ridgw.), Ridgw. in Baird, Brewer, & Ridgw. N. Amer. 
Birds, ii. 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, 1. p. 256 (1899) °. 
Supra brunneo-fuscus: subtus albus, undique griseo-fusco et ferrugineo variegatus; tibiis albis, distincte et 
regulariter griseo-fusco transfasciatis, rhachidibus fuscis; cauda fusca, pallide fusco frequenter trans- 
fasciata. Long. tota circa 19-0, alee 14:2, caudee 8°5. (Descr. maris vix ad. ex Tres Marias Is., W. Mexico. 
Mus. nostr.) 
Hab. Mexico, Tres Marias Is. (Grayson !*, 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 4 
describes the adult as follows :— 
“Entire head and neck nearly uniform smoky brown, with scarcely a trace of lighter 
markings on throat or chin. Back and wings blackish brown; 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 B. 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. 889*; Dresser, Ibis, 1865, p. 324°; Coues, Birds N.-West, p. 852°; Ridgw. in Baird, 
Brewer, & Ridgw. N. Amer. Birds, iii. p. 2927; 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. 8, p. 52"; A. O. U. Check-l, N. Am. Birds, 2nd ed. p. 131”. 
Fuliginoso-niger, capitis et cervicis plumis ad basin albis : subtus albo indistincte variegatus, tibiis vix fasciatis ; 
BIOL. CENTR.-AMER., Aves, Vol. III., November 1900. 9 
