88 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 74 



the pale spot on the chin indicated, but the superciliaries faintly 

 marked or obsolete. 



Measv/rements. — Male: Wing, 53-59 (average, 56); tail, 51-58 

 54.5); bill, 9.5-10.5 (10.3); tarsus, 18.5-20.5 (20). Female: Wing, 

 51-56 (54) ; tail, 49-56 (52.5) ; bill, 9.5-10.5 (10.2) ; tarsus, 1^20.5 

 (20). 



Range. — Southern Guatemala to Costa Rica (except southwestern 

 part) . 



Reinarl:s. — Bonaparte's type probably came from western Nica- 

 ragua, although the authors of the " Biologia Centrali-Americana " 

 express some doubts on this point. In Costa Rica it is found in the 

 eastern and northern parts of the country, everywhere in fact (within 

 its zonal limits) except in the extreme southwestern part, in the Ter- 

 raba Valley. Salvin and Godman extended its known range to 

 Guatemala, but at first confused it with " By rufifi^ojis and " B^ 

 salvini, so that Mr. Ridgway was lead to place all their records from 

 that country under the latter form. That this was a mistake is evi- 

 dent from an examination of the specimens in the collection of the 

 British Museum on which these records were based. The localities 

 represented are Calderas, La Trinidad (both on the Volcan de 

 Fuego), and Volcan de Agua, the specimens being perfectly typical 

 of delattrii. More recently Doctor Dearborn has recorded this species 

 from Patulul and Lake Amatitlan, in the same general region. 

 Since "5." ruffrons ruflfrons is known from Lake Atitlan and 

 Dueiias it is clear that delattrii and 7^flfrons can not possibly be 

 geographical races of one species, since their respective ranges meet 

 while their characters continue constant, the two remaining perfectly 

 distinct. B. delattrii may always be known from " 5." ruflfrons by 

 its relatively shorter tail (shorter than the wing instead of longer), 

 its completely and more uniformly yellow under parts, and by its 

 wholly rufous auriculars, without any white band or streak below. 

 The chestnut of the pileum is rather darker, too, and shows no tend- 

 ency to division in the middle by a paler streak, as is so often the 

 case in " j&." ruflfrons. For all the close external resemblance between 

 these two forms, I am inclined to separate them generically. 



Specimens examined. — Guatemala : Lake Amatitlan, 2 ; Patulul, 

 Solola, 7 ; Volcan de Agua, above San Diego, 1 ; Calderas, Volcan de 

 Fuego, 1 ; La Trinidad, Volcan de Fuego, 1. Nicaragua : Rio Coco 

 (Wanks River), 1; Muy Muy, 1; Volcan Viejo, Chinandega, 2; 

 Volcan de Chinandega, 3; Las Canas (6 miles E. of Matagalpa), 

 2,500 feet, 1; Matagalpa, 3; Leon, 1. Costa Rica: San Jose, 39; 

 Cartago, 3; Guayabo, 10; Santa Maria de Dota, 1; Cerro Santa 

 Maria, 1 ; Tenorio, 8 ; Miravalleg, 3 ; Bebedero, 1 ; San Juan, 1 ; Monte 



