ART. 7 REVISION- OF THE GENUS BASILEUTERUS TODD 91 



Coban and Lake Yzabal. Hence -flavlgaster is a synonym of the 

 earlier sahini, which ranges northward from Vera Cruz in Guate- 

 mala to the Mexican State of Vera Cruz, where it probably inter- 

 f^rades with /. 'i^cfifrons jouyi. Of four birds from San Andres 

 Tuxtla, Vera Cruz, only one is typical, the other three being more 

 or less intermediate towards jouyi. A few miles west of Coban, at a 

 place called Finca la Primavera, true rufifrons occurs, and again at 

 Lake Atitlan, in the southwestern part of the country, so that the 

 ranges of the two forms approximate each other here, without any 

 signs of intergradation taking place. 



The coloration of /. ni-jlfrons sdlmni., resembling as it does that of 

 Basileuterus delating seems to have induced Mr. Ridgway to unite 

 the two groups represented, respectively, by ni^fifrons and delattni 

 under one specific heading, making them conspecific. According to 

 my views they are not even congeneric. The relatively long tail of 

 salvini, with narrowed rectrices, its short, more rounded bill, and 

 the white line under the auriculars, separate it definitely from B. 

 delattrii and align it with /. rufjfrons. There is absolutely no indi- 

 cation of intergradation between rufjfrons and delattru where their 

 respective ranges approximate. 



Specimens examined. — Guatemala: Coban, Vera Paz, 3 (including 

 type) ; Cahabon, 1 (not typical) ; Finca Sepecuite, 5; Secanquim, 4; 

 unspecified, 5. Mexico: Teapa, Tabasco, 1; Yajalon, Chiapas, 1 

 (type of " BP -ftavigaster Nelson) ; San Andres Tuxtla. Vera Cruz, 

 4; unspecified, 2. Total, 26. 



IDIOTES RUFIFRONS RUFIFRONS (Swainson) 



Setophaga rufifrons Swainson, Anim. iu Menag., 1S38, p. 294 ('"Mexico"; 

 orig. clescr. ; type in coll. Berlin Mus. [?]). 



Basileuterus 7-ufifron.s- Bonapartk, Consp. Avium, vol. 1, 1850, p. 314 

 (Mexico; diag.). — Sclateh;, Proc. Zool. Soc. London, 1856, p. 291 

 ([Cordova?], Vera Cruz) ; 1858, p. 299 (La Parada, Oaxaca) .— Baird, Rev. 

 Amer. Birds, 1865, p. 248, part (Jalapa and Mirador, Vera Cruz; descr. ; 

 refs. ; crit.).— Sclatejb, Proc. Zool. Soc. London, 1865, p. 284 (refs. ; 

 diag.; range). — Salvin, Proc. Zool. Soc. London, 1867, p. 136, in text 

 (range). — Sumichkast, Mem. Boston Soc. Nat. Hist., vol. 1, 1869, p. 

 546 (Temperate Region, Vera Cruz). — Lawrence, Bull. U. S. Nat. Mus., 

 No. 4, 1876, p. 16 (Guicbicovi, Cliiapas). — Salvin and Godman, Biol. 

 Centr.-Amer., Aves, vol. 1, 1881, p. 175. part (S. Mexico and Guatemala 

 [part] localities and refs.; descr.; crit.). — Shabpe, Cat. Birds Brit. Mus., 

 vol. 10. 1885, p. 397, excl. syn. part (Jalapa, Vera Cruz, and Cinco 

 Senores, Oaxaca ; Dueiias, Guatemala ; descr. ; refs. ) . — Ridgway, Proc. 

 U. S. Nat. Mus., vol. 15, 1892, p. 119, in text (Mirador and Jalapa, Vera 

 Cruz; Guicbicovi, Oaxaca; crit). — Chapman, Bull. Amer. Mus. Nat. Hist., 

 vol. 10, 1898, p. 25 (Jalapa, Vera Cruz). — Todd and C.\rbiker, Ann. 

 Carnegie Mus., vol. 14, 1922, p. 440, in text (crit.). — Berlioz, Rev. Franc. 

 d'Orn., vol. 8, 1923, p. 159 (Orizaba, Vera Cruz). 



