5. TEOGON. 405 



more distinct form, though it is only to be distinguished from tj-pical 

 T. meridionaUs from Guiana by its entirely black wing-coverts. 

 So far as our specimens show these two do not intergrade, but their 

 immature males are very similar and both have the wing-coverts 

 somewhat vcrmiculated with white as in the adult of T. meridi- 

 onaUs ; and it is probable that when specimens of T. ramonianiis 

 are obtained from the Lower Amazons, which more nearly approach 

 the range of the last-named, they will be found to intergrade. 

 It might perhaps be best to consider the three forms as merely 

 local races of one species, T. caligatus. 



14. Trogon caligatus. 



Trogon caligatus, Gould, Mon. Trog. ed. i. pi. 7 (1838) ; Gray, Gen. 



B. i. p. 70 (1845) ; Gray, List B. Brit. Mus. pt. ii. sect. i. Fissi- 



rostres, i. p. 43 (1848); Sclat. P. Z. S. 1856, p. 286; i: Feb. 



Sitz. Ak. Wien, xx. p. 405 (1856) ; Gould, Mon. Trog. ed. ii.pl. 16 



[text] (1858) ; Sclat. P. Z. 8. 1860, p. 284 ; Lawr. Ann. Lye. 



Netc York, vii. p. 290 (1861) ; Tacz. P. Z. S. 1877, p. 328 ; Sah. 



^ Godm. Ibis, 1880, p. 174; Boucard, P. Z. S. 1883, p. 454; 



Tacz. Orn. Perou, in. p. 173 (1886). 

 Trogon (Aganus) caligatu.'t. Gray, Hand-l. B. i. p. 81 (1869). 

 Trogon concinnus, Luiar. Ann. Li/c. Neic York, vii. p. 463 (1862). 

 Aganus lepidus, Cab. ^- Heine, Mus. Hein. Th. iv. p. 187 (1863). 

 Aganus braccatus, Cab. ^- Heine, Mus. Hein. Th. iv. p. 184 (1863). 



Adidt male. Head and throat black ; nuchal collar and chest 

 peacock-blue shaded with purple ; back and upper parts bronze- 

 green, inclining to bluish on the upper back, rump, and upper tail- 

 coverts ; a more or less distinct white pectoral band ; breast and 

 rest of underparts orange-yellow ; sides grey ; thighs black ; pri- 

 maries and secondaries black with white bases, the former with 

 white margins to, and the latter with white vermiculations on, the 

 outer webs ; greater ])rimary-coverts black, rest of the coverts 

 finely vcrmiculated with black and wliite ; middle pair of tail- 

 feathers green glossed with blue and tipped with black, second and 

 third pairs the same with the inner webs black, thi-ee outer pairs 

 each with the basal and central jjart black, a wide white terminal 

 band, and the rest regularly barred with black and white, the latter 

 narrower : bill horn)' yellowish black. Total length 9-7 inches, 

 wing 4-8, tail 4-7, tarsus 0-55. 



In a nearly mr.ture male the nuchal collar is less bright and more 

 diffuse, extending somewhat over the back of the head, some of the 

 greater coverts and inner secondaries are coarsely and irregularly 

 barred with white, the three centre pairs of tail-feathers are black 

 slightly glossed with green, and in the three outer pairs the black 

 and white transverse markings are less regular. 



In a younger bird the back of the head and an irregular band 

 across the upper chest are bluish green, and the throat and remainder 

 of chest are blackish grey. 



In a still younger bird no nuchal collar is developed, and the 

 chest and wings are nearly like tliose of the adult female. 



Adult female. Head, throat, chest, and upper parts blackish grey ; 



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