BASILEUTERTJS. 



249 



bright yellow, abruptly defined against the whitish of under parts. Inside 

 and edge of wings yellow ; flanks and crissum pale brownish-fulvous ; tibise 

 more ashy. No spots or bands on wings or tail. The feathers along the 

 middle of forehead and vertex with concealed yellow at the base. 



Length, 4.80 ; wing, 2.00 ; difference between Ist and 4th (longest) quills, 

 .24; tail, 2.40; its graduation, .55 ; bill from gape, .55 ; tarsus, .80. 



This species is sometimes described as quite cinereous above ; 

 this, however, depends on the state of plumage — perfect specimens 

 being nearly as olivaceous as in delattrii. Occasionally specimens 

 are found in which the line of demarcation behind of the yellow 

 breast is obscured by the color passing backwards over the belly in 

 a light wash pervading the whole under parts, the edges of the 

 feathers brighter yellow, leaving the anal region, however, nearly 

 white. The flanks, crissum, and tibiae, are then tinged with greenish 

 olive. 



(30,876.) Iris reddish-brown. 



Basileuterus delattrii. 



Basileuterus delattrii, Bon. Comptes Rendus, XXXVIII, 1854, 383. — Ib. 

 Notes Orn. 1854, 63 (Nicaragua).— Sol atek, P. Z. S. 1860, 250 

 (Orizaba). — Ib. Catal. Am. Birds, 1861, 35, no. 211.— Sclatek & 

 Salvin, Ibis, II, 1860, 274, Dueflas ((Juatemala) , May 8. 



Hab. Mexico and Guatemala ? 



(No. 30,700.) Similar to rufifrons in color of head, the olive green of the 

 back brighter, this color invading and replacing the ashy of the nape and 

 sides of neck ; the infra-ocular white band, less distinct behind, but appa- 

 rently extending behind the eyes. Whole under parts greenish-yellow, a, 

 little paler on middle of belly ; flanks olive green ; the sides behind and 

 crissum tinged with fulvous. Wings much rounded, about equal to the 

 lateral tail feather ; 1st quill shorter, or not longer than the secondaries, as is 

 the case in rufifrons. 



Total length, 5.10 ; wing, 2.10 ; tail, 2.70 ; graduation, .52 ; difference be- 

 tween 1st and 4th quills (longest), .28 ; length of bill from nostril, .31 ; along 

 gape, .60 ; tarsus, .82. 



Since receiving an authentic specimen from Mr. Salvin I have 

 found that several specimens from Mexico, formerly considered to 



