86 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 74 



BasUeuterus rufifrons mesochrysus Ridgway, Bull. U. S. Nat. Mus., No. 50, 

 vol. 2, 1902, p. 750 (descr. ; range; refs.). — Thayeb and Bangs, Bull. Mus. 

 Comp. Zool.. vol. 46, 1906, p. 221 (Savanna of Panama). — Bangs, Proc. 

 Biol. Soc. Washington, vol. 22, 1909, p. 36 (Buenos Aires, El General, 

 and Boruea, Costa Rica; range; crit). — Carrikeb, Ann. Carnegie Mus., 

 vol. 6, 1910, p. 797 (Costa Riean localities and refs.; range; habits). — 

 Chapman, Bull. Amer. Mus. Nat. Hist., vol. 36, 1917, p. 553 (near Honda, 

 Chicoral, and belovp Andalucia, Colombia ; Colombian refs. ) . — Stone, 

 Proc. Acad. Nat. Sci. Philadelphia, 1918, p. 274 (Gatun and Pedro 

 Miguel, Panama). — Goldman, Smithsonian Misc. CoU., vol. 69, No. 5, 

 1920, p. 30 (Panama; faunal range). — Haixinan, Auk, vol. 41, 1924, p. 

 324 (Valley Rio Algarrobo, Sosa Hill, and Farfan, Panama; food). 



Basilevterus rufifrons delattrii Bangs, Auk, vol. 24, 1907, p. 306 (Boruea 

 and Paso Real, Costa Rica). 



Suhspecific characters. — Similar to Basileutei^us delattrii delattrii^ 

 but back lighter (more yellowish) olive green; gray nuchal band 

 more conspicuous ; under parts purer yellow, with less greenish shad- 

 ing on the sides and flanks ; white maxillary and mental sDots larger, 

 usually continuous with the suborbital spot ; and tail shorter. 



Measurements. — Male : Wing, 54-61 (average, 57.5) ; tail, 50-54 

 (^2); bill, 10-11 (10.5); tarsus, 19-21 (20). Female: "Wing, 53-59 

 (55.5) ; tail, 45-53 (50.5) ; bill, 9.5-11 (10.5) ; tarsus, 19-21 (19.8). 



Range. — Southwestern Costa Rica through Panama to the Magda- 

 lena Valley and Santa Marta region of Colombia, in the Tropical 

 Zone. 



Reviarks. — Sclater at first confused this form with delattrii of 

 Bonaparte, but soon recognized its characters and described it in an 

 informal way in 1860. As first suggested by Mr. Cherrie, it is 

 clearly conspecific with delattrii.^ and like that form is a Tropical 

 Zone bird, not going above 4,000 feet elevation. Oddly enough, there 

 are no records for western Colombia, or even for the lower Atrato 

 Vallej', but it is apparenth' a common species in the Santa Marta 

 region as well as in the Magdalena Valley, which latter must have 

 been the actual source of the type specimen, and not " Bogota." 



Specitne'Tis examined. — Costa Rica: Boruea, 15; Buenos Aires, 6; 

 El General, 18; Paso Real, Boruea, 1. Panama: Boqueron. Chiri- 

 qui, 1; Panama. 5; Balboa, 2; Farfan, 1; Gatun, 1; Colon, 1; Chitra, 

 Veragua, 1 ; " Porto Bello Trail, Continental Divide," 1 ; unspecified, 

 5. Colombia: Cacagualito, 5; Bonda, 3; Minca, 16; Agua Dulce, 1; 

 Mamatoco, 3; Cincinnati, 1; La Tigrera, 10; Pueblo Viejo, 2; San 

 Antonio, 1 ; La Concepcion, 12; Palomina, 7; San Franacisco, 1 ; Santa 

 Marta Mountains. 5: Aguachica, 1; El Cauca, 7; El Tambor, 1; 

 Mariquita, 1: Andalucia (3,000 feet), 9; Chicoral, Coello River (1,800 

 feet), Tolima, 3: within 20 miles of Honda, Tolima, 1; Cunday, 1; 

 " Bogota," 13. Total, 159. 



