FAMILY RAMPHASTIDAE 511 



A slender-bodied toucan, with narrow graduated tail ; maxilla mainly 

 white or yellowish white ; band on lower breast narrow. 



Description. — Length 390-440 mm. Serrations on cutting edge of 

 maxilla coarse with the large notches marked with black. Adult male, 

 head and neck on both upper and lower surfaces glossy, somewhat 

 greenish black; narrow collar across base of hindneck cinnamon- 

 rufous ; back, scapulars, and wing coverts slightly glossy olivaceous- 

 black ; lower back, rump, and upper tail coverts bright red ; tail with 

 shaft lines black, rest of feathers olivaceous-black ; wings black, edged 

 with olivaceous-black; under surface yellow, washed more or less 

 with red on breast ; upper breast with a central spot of black, variable 

 in size ; upper abdomen with a band of red mixed with black, variable 

 in width, and in extent of black; under tail coverts sulfur-yellow 

 mixed with light red ; tibia cinnamon-rufous or rufous ; under wing 

 coverts white to grayish white, or pale yellow ; bases of flight feathers 

 dull yellowish white. 



Adult female like male, except for a small spot of rufous hidden 

 on the bases of auricular feathers. 



Juvenile, cutting edge of maxilla smooth in early stages, with 

 notches developing as the bird matures ; otherwise like adult. 



A male, taken at Armila, San Bias, March 10, 1963, had the iris 

 bright yellow ; bare skin on side of head surrounding the eye and ex- 

 tending forward to the base of the maxilla reddish orange ; an indis- 

 tinct ring on edge of eyelids fuscous-black; culmen, tip of maxilla, 

 bases of notches on cutting edge, and entire mandible black; side of 

 maxilla dull buffy white, shading through dull green to dull reddish 

 brown at base; a narrow but prominent line completely around the 

 base of the entire bill clear yellowish white; tips of notches on edge of 

 maxilla clear yellowish white ; tarsus and toes dull green ; claws black. 



Measurements. — Males (10 from Panama) wing 139.9-151.2 

 (145.7), tail 144.2-161.0 (155.5), culmen from base 90.6-114.8 

 (102.2), tarsus 36.1-39.3 (37.6) mm. 



Females (10 from Panama and eastern Costa Rica) wing 137.0- 

 148.9 (144.4), tail 142.2-156.0 (152.8), culmen from base 86.4-106.2 

 (96.2), tarsus 35.2-36.2 (35.8) mm. 



Resident. Found on the Pacific slope from the western Canal Zone 

 eastward through eastern Province of Panama and Darien to the 

 boundary with Colombia ; on the Caribbean side from western Bocas 

 del Toro to far eastern San Bias (Puerto Obaldia) ; to 600 meters on 

 the Boquete trail, Bocas del Toro ; 550 meters on Cerro Pirre, Darien. 



In the Canal Zone the collared aragari is common on the Atlantic 



