862 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



KEY TO THE SPECIES OF ERATOR. 



a. Auricular region pure white or lilack. (Adult males.) 

 b. Auricular region black. 

 c. Tail black (including til)) with only extreme base of inner web white. 

 d. Larger (wing 111-115 mm.). (Southeastern Brazil.) 



Erator inquisitor inquisitor, adult male (extra! imital)« 

 dd. Smaller (wing 98-105.5 mm.) (Northeastern Brazil to Guiana and Co- 

 lumbia.) Erator inquisitor erythrogenys, adult male (extralimital) ^ 



cc. Tail with basal half or more gray on outer webs, white on inner webs, and tip 

 white. (Lower Amazon Valley to southern Brazil. ) 



Erator pelzelni, adult male (extralimital) c 

 bb. Auricular region white, 

 c. Upper parts deeper gray; inner webs of rectrices with more than basal half pale 

 gray. (Southern Mexico to Peru.) 



Erator albitorques, achilt male (p. 863) 



cc. Upper parts much paler gray, nearly white on secondaries and rump; inner 



webs of rectrices black for nmch the greater part. (Eastern Ecuador.) 



Erator buckleyi, adult male (extralimital )d 

 aa. Auricular region rusty brown or chestnut. (Adult females and young.) 

 b. Tail black, 

 c. Larger (wing 103-106 mm.); back browner gray. 



Erator inquisitor inquisitor, adult female (extralimital) 

 cc. Smaller (wing 96-100 mm.); liack clearer gray. 



Erator inquisitor erythrogenys, adult female (extralimital) 

 bb. Tail with basal half gray, lii> (narrowly) white or pale gray. 



Erator albitorques, adult female and young male (pp. 863, 864) 



aL[anius] inquisitor Lichtenstein, Verz. Doubl., 1823, 50 (Sao Paulo, s. Brazil; coll. 

 Berlin Mus.). — P saris inquisitor D'Orbigny, Voy. Am. Merid., Ois., 1839, 302. — Tityra 

 inquisitor Cabanis, in Wiegmann's Archiv. fiir Naturg., 1847, pt. i, 239; Sclater, Cat. 

 Birds Brit. Mus., xiv, 1888, 331. — E[xetastes] inquisitor Cabanis and Heine, Mus. Hein., 

 ii, Oct., 1859, 84. — Psaris jardinii Swainson, Zool. Illustr., ser. 2, i, 1829, pi. 35 (int. of 

 Brazil). — Psaris nattereri Swainson, Anim. in Menag., Jan. 1, 1838, 286 (= young 

 male). — Psaris selbii Swainson, Anim. in Menag., Jan. 1,1838, 286. — Tityra (Eratbr) 

 inquisitrix Pelzeln, Oru. Bras., ii. Abth., 1869, 120. — Tityra atricapilla (not of Vieillot, 

 1816) Bertoni, Av. Nuev. Parag., 1901, 109 (Paraguay). 



b Psaris erythrogenys Selby, Zool. Journ., ii, 1826, 483 (Pernambuco, n. e. Brazil). — 

 Tityra erythrogenys Berlepsch and Hartert, Novit. Zool., ix, Apr., 1902, 55 (Rio Cata- 

 iiapa, Perico, Maipures, and Suapure, Venezuela). — Tityra inquisitor erythrogenys 

 Hellmayr, Novit. Zool., xiii, July, 1906, 327, 328 (crit.). — Tityra inquisitrix Sclater, 

 Proc. Zool. Soc. Lond., 1857, 18 (Bogota, Colombia). 



c Tityra {Erator) albitorques (not Tityra albitorques Du Bus) Pelzeln, Orn. Bras., ii. 

 Abth., 1869, 12^.— [Tityra] albitorques Pelzeln, Orn. Bras., iv. Abth., 1870, 427.— Tityra 

 albitorques Sclater, Cat. Birds Brit. Mus., xiv, 1888, 332, part (Mattogrosso) ; Riker and 

 Chapman, Auk, viii, 1891, 25 (Santarera, Lower Amazon) ; Allen, Bull. Am. Mus. N. H. , 

 V, 1893, 110(Corumba and Chapada, Mattogrosso, s.w. Brazil). — Tityra pelzelni Salvin 

 and Godman, Biol. Ccntr.-Am., Aves, ii, Dec, 1890, 120, footnote f Mattogrosso, s. w. 

 Brazil; coll.?). 



d T[ityra] albitorques (not of Du Bus) Allen, Auk. v, 1888, 287, in text (Rio Napo, e. 

 Ecuador; crit.). — Tityra albitorques Allen, Bull. Am. Mus. N. H., ii, 1889, 73 (Rio 

 Napo; crit.). — Tityra buckleyi Salvin and Godman, Biol. Centr.-Am., Aves, ii, Dec, 

 1890, 120, footnote (Yanayacu, e. Ecuador; coll.?). 



