FAMILY TROCHILIDAE 277 



Bill sickle-shaped; green above, white heavily streaked with black 

 underneath. 



Description. — Length 120-130 mm. Adult (sexes alike), above, 

 including wing coverts, metallic green ; feathers of crown margined 

 with dusky; rump and upper tail coverts more or less bluish green, 

 edged with dull buff ; tail feathers dull bronzy green, brighter on the 

 central pair, tipped with white ; wings blackish slate, with a faint wash 

 of violet ; innermost secondary (in some specimens, others also) tipped 

 lightly with white; under surface sooty black, streaked heavily with 

 white ; side of head and f oreneck washed lightly with buff. 



Immature, feathers of upper surface tipped more or less with buff; 

 remiges tipped lightly with white. 



A male taken on the Rio Pequeni, Panama, March 5, 1961, had the 



Figure 40. — Head of sicklebill, pico de hoz, Eutoxeres aquila salzrini. 



iris dark brown ; maxilla and tip of mandible black; rest of mandible, 

 including the inside (except for the tip which is dark), and gape 

 yellow; scutes on front of tarsus, toes, and claws fuscous; back of 

 tarsus purplish white. 



An adult female, collected at Almirante, Bocas del Toro, February 

 15, 1958, had the iris dark brown; bare eyelids dull neutral gray; 

 maxilla, tip of mandible, and line of gonys black ; sides of mandible 

 nearly to the tip, gape, inside of floor of mouth and the tongue, ex- 

 cept for the tip, honey yellow; tip of tongue duller, browner; front 

 of tarsus and top of toes fuscous ; crus dull white ; back of tarsus 

 (which is without scales) dull purplish gray ; claws dusky neutral gray. 



Measurements. — Males (10 from Panama), wing 69.7-77.4 (73.0), 

 tail 49.0-53.1 (51.1), chord of culmen from base 25.5-27.9 (26.7) 

 mm. 



Females (12 from Panama), wing 68.0-71.7 (69.4), tail 49.1-54.0 

 (51.0), chord of culmen from base 26.4-28.5 (27.5) mm. 



Weight, J 1 , 11 grams (recorded by George V. N. Powell). 



Resident. Locally fairly common in the Tropical and lower Sub- 

 tropical Zones; on the Caribbean slope found in Bocas del Toro 



