BIRDS OF NORTH AND MIDDLE AMERICA. 311 
Bill sickle-shaped, compressed except at base, where broad and 
depressed, the curve of the culmen forming nearly one-third of a 
circle; tomia smooth; maxilla with 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 inner 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 tapering 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, fading into 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 olive (more greenish on middle rectrices), the lateral rectrices exten- 
sively white terminally. (Hutozeres 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 Ecuadér.) 
Eutoxeres aquila aquila (extralimital).¢ 
ec. White 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 Ecuadér.) 
Eutoxeres aquila heterura (extralimital).® 
@ Troch{[ilus] aquila Bourcier, Proc. Zool. Soc. Lond., xv, 1847, 42 (Bogoté, Colombia; 
coll. Loddiges).—Eutoxeres aquila Reichenbach, Aufz. der Colibr., 1854, 15; Mulsant 
and Verreaux, Hist. Nat. Ois.-Mouch., i, 1873, 27, pl. 1; Elliot, Synop. and Classif. 
Hum. Birds, 1879, 3, part; Salvin, Cat. Birds Brit. Mus., xvi, 1892, 261.—E[utozxeres] 
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, Ecuadér; coll. J. Gould).—Eutozeres heterura 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.—Eutozeres aquila 
heterura Taczanowski and Berlepsch, Proc. Zool. Soc. Lond., 1885, 102.—E[utoxeres] 
aquila heterura Hartert, Das Tierreich, Troch., 1900, 29. 
