PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 477 



The result Avould of course be somewhat changed with a different 

 proportion of specimens representing tlie several regions; but in any 

 case it would probably be shown, that the general dimensions increase 

 in proportion to the distance of the locality from the ecpiator, and that 

 the tail is most deeplj' einarginated in the most southern exami)les, 

 becoming gradually less forked toward the northward. 



7.— TYEANNUS ALBIGULAEIS. 



Ti/rannus alhogularis, BuRJi., Tli. Bras. II, 1856, 465 (uortlicm forest-district of Brazil). — 

 Pklz., Oru. Bras. 1871, 117 (Goiaz, Ciiyaba, Matogrosso, and S. Viceute). 

 Tyrannus albigidaris, Fixsch, P. Z. S. 1870, 572, iu text sub T. mclancliolicus 

 (critical).— SCL. & Salv., Norn. Neotr. 1873, 53. 



" Musdca^Hi alhiijulcf, Natterer, Catal. Msc." {Fdzdn). 



Sp. Ch. — "Head gray; middle of the crown fire-red; back green; 

 throat white; breast and belly yellow ; wings and tail more brownish, 

 the feathers with lighter edges. 



"A little smaller than the preceding species [T. mclancliolicus], more 

 slender and of more graceful form, the beak especially. Crown, as far 

 as the eye, and nape light whitish gray, rictal region ("Ziigelgegeud") 

 and upper half. of the ear-coverts blackish, the cheeks and the lower half 

 of the ear-coverts as well as the throat, pure white. Back and lesser 

 wing-coverts ("Achselfedern") olive-green, the upi)er tail-coverts brown- 

 ish. Wings and tail-feathers grayish brown, the first narrowly edged 

 with whitish green, the latter with rust-yellow, particularly towards the 

 base ; the inner edge of the wing of the same color, but broader, wanting 

 on the tail-feathers. Only the three first primaries attenuated and einar- 

 ginated, but the tip ("Absatz") much shorter and blunter [than in T. mc- 

 lancliolicus]. Breast, belly, thighs and anal region lemon-yellow; there 

 is no gray shade on the breast, but the yellow color with greenish tint 

 extends here as fsir as the neck. Beak and legs blackish brown, iris 

 brown; the beak on the whole smaller, considerably shorter, with a dis- 

 tinct though blunt ridge and moderately convex ; . . . . the toes longer. 



"Total length 8", culmen 7'", wings 4", tail iu the middle 3", along 

 the outer feather 3" 4'", commissure 8'", middle toe without claw 0'". 



"The species inhabits the northern forest-region of Brazil, near Bahia, 

 and Pernarabucco ; it entirely resembles the preceding in its habits and 



