BIRDS OF NORTH AND MIDDLE AMERICA. 311 



Bill sickle-shaped, compressed except at base, where broad and 

 depressed, the curve of the culmen formmg nearly one-third of a 

 circle; tomia smooth; maxilla witli a narrow lateral groove parallel 

 to culmen and a narrow ridge near tomium ; culmen rounded, some- 

 what ridged basally. Nostril narrow, slit-like, overhung by a broad, 

 convex, tumid naked operculum. Tarsus very stout, feathered for 

 upper anterior portion, longer than anterior toes; toes all very stout, 

 the middle and mner ones of equal length, the outer slightly but 

 decidedly shorter; middle toe equally united to outer and inner toes, 

 the extent of cohesion involving slightly less than basal phalanx; 

 hallux very strong, slightly longer than outer toe (without claw). 

 "Wing decidedly more than twice as long as exposed culmen (chord), 

 the outermost primary longest. Tail nearly to quite three-fourths as 

 long as wing, graduated, the rectrices broad but tapermg to an obtuse 

 point terminally. 



Coloration. — Above rather dull metallic green, the pileum dull 

 dusky (sometimes a band of metallic greenish blue across hindneck) ; 

 tail dull bronze or bronze-dusky, the rectrices tipped with whitish, or 

 the three lateral pairs cinnamon, fadmg mto whitish at tip; under 

 parts conspicuously streaked with dusky and whitish or pale tawny. 

 Sexes alike. 



Range. — Costa Rica to northern Peru. (Four species.) 



KEY TO THE SPECIES AND SUBSPECIES OF EUTOXERES. 



a. Pileum wholly feathered; lateral rectrices bronzy olive or grayish, with or without 

 white tip. 

 b. Tail bronzy olivo (more gi-ecnish on middle rectrices), the lateral rectrices exten- 

 sively white terminally. {Eutoxcres aquila.) 

 c. White tips to rectrices longer, wedge-shaped basally, the shaft white for more 

 than the white portion of the webs. (Central Colombia to eastern Ecuador.) 



Eutoxeres aquila aquila (extralimital).o 



cc. WTiite tips to rectrices shorter, more truncated basally, the shaft white only as 



far as white portion of webs. 



d. Tail-spots nearly pure white; larger (male averaging: wing 73.7, tail 53.3, 



culmen 25.9). (Costa Rica to Colombia.). Eutoxeres aquila salvini (p. 312). 



dd. Tail-spots dull brownish white or pale buffy; smaller, with larger bill (male 



averaging: wing 71.5, tail 49.5, culmen 26.8). (Western Ecuador.) 



Eutoxeres aquila heterura (extralimital).^ 



a Troch[ilus] aquila Bom-cicr, Proc. Zool. Soc. Lond., xv, 1847, 42 (Bogotd, Colombia; 

 coll. I.ioddiges). — Eutoxeres aquila Reichenbach, Aufz. der Colibr., 1854, 15; Mulsant 

 and Verreaux, Hist. Nat. Ois.-Mouch., 1, 1873, 27, pi. 1; Elliot, Synop. and Classif. 

 Hum. Birds, 1879, 3, part; Salvin, Cat. Birds Brit. Mus., xvi, 1892, 261.— E[utoxeres] 

 aquila (typicus) Hartert, Das Tierreich, Troch., 1900, 29. 



b E[utoxeres] heterura Gould, Ann. and Mag. N. H., ser. 4, i, no. vi, June, 1868, 456, 

 in text (Quito, Ecuador; coll. J. Gould). — Eutoxeres heter-ura Gould, Introd. Troch., 

 oct. ed., 1861, 36; Elliot, Classif. and Synop. Troch., 1879, 3. — Eutoxeres aquila var. 

 heterura Mulsant and Verreaux, Hist. Nat. Ois.-Mouch., i, 1873, 27. — Eutoxeres aquila 

 heterura Taczanowski and Berlepsch, Proc. Zool. Soc. Lond., 1885, 102. — E[utoxeres] 

 aquila heterura Hartert, Das Tierreich, Troch., 1900, 29. 



