FAMILY TROGONIDAE 393 



Measurements of the southern group, which have been separated 

 as the race hoffmanni are given above. Northern birds (T. m. 

 massena) have the following dimensions : 



Males (10 from Veracruz, Chiapas, Guatemala, and Honduras), 

 wing 176-181 (177.3), tail 170-193 (176.0), culmen from base 25.3- 

 28.1 (26.6), tarsus 17.0-18.5 (17.8) mm. 



Females (10 from Veracruz, Campeche, Oaxaca, Guatemala, and 

 Honduras), wing 172-181 (176.6), tail 170-180 (175.0), culmen 

 from base 25.0-27.8 (26.3), tarsus 17.2-18.4 (17.9) mm. 



Though the size difference in wing and tail is evident, some have 

 questioned the separation in two races. From present information it 

 seems desirable to recognize them. 



TROGON MELANURUS MACROURA Gould: Long-tailed Trogon, 

 Aurora Colilarga 



Trogon macroura Gould, Mon. Trogonidae, pt. 3, 1838, pi. [5] and text [= pi. 17 

 in complete volume]. (Rio Atrato, Colombia.) 



Like the Massena trogon (Trogon massena hoffmanni) except 

 that the tail is slightly longer than the wing; the male with a white 

 line across the chest between the metallic green and the red of this 

 area and the central rectrices blue to bluish green; female slightly- 

 paler gray on upper surface, foreneck and upper breast ; bill slightly 

 smaller, narrower, less than 22.0 mm. broad at base. 



Description. — Length 290-330 mm. Adult male, above metallic 

 green varying to slightly golden or bluish green ; central rectrices 

 bluish to bluish green, outer pairs dull black lightly freckled with 

 grayish white, principally on the outer web ; wing coverts and outer 

 webs of secondaries barred narrowly and irregularly with black and 

 grayish white ; primaries and primary coverts dull black, the pri- 

 maries edged lightly on the outer webs with white ; forehead, side of 

 head, and throat black; lower foreneck and upper breast metallic 

 green, bordered below by a narrow band of white ; lower breast, sides, 

 abdomen, and under tail coverts deep red ; under wing coverts slate, 

 banded narrowly with white ; tibia slaty black. 



Adult female, upper surface and throat light slate; side of head 

 and wing coverts blackish slate, the latter mottled indistinctly with 

 dull grayish white ; primaries, primary coverts, and tail slaty black ; 

 upper breast and sides pale slate; rest of under surface rather light 

 bright red. 



An adult male, taken February 5, 1961, at 460 meters elevation on 



