TROGON. 487 
confines of the region to the limits of the Brazilian fauna, being absent in Argentina, 
Chili, and the extreme south. Of the twenty-four species admitted in Mr. Grant’s 
Catalogue * no less than fourteen are found within our limits. Of these seven occur 
in Mexico, some of them nearly reaching the northern frontier, and one even passing 
it into Arizona; six occur in Guatemala and five in Honduras. ‘The more southern 
forms then begin to appear, for in Nicaragua we find seven species, and eight in Costa 
Rica and Panama. 
The only species with wide southern range is 7. atricollis, which penetrates as far 
north as the Segovia river, dividing Honduras from Nicaragua. In the south this 
species is subject to local variations which are discussed at length below. Other 
species passing into the southern continent are 7. chionurus and T. caligatus as far as 
Western Ecuador, both of them with close southern allies, and 7. macrurus, a species 
restricted to Panama and Colombia. ‘The other ten species are restricted to our fauna: 
of these, 7. dairdi and T. clathratus belong to Costa Rica and Panama; 7. chrysomelas 
to Eastern Nicaragua ; 7. mexicanus to Southern Mexico and Guatemala; 7. ambiguus 
and 7. citreolus to Mexico; T. melanocephalus to Mexico and Costa Rica and the 
intervening country; 7. massena to Mexico and Panama and all between; 7’. elegans 
to the country between Guatemala and Costa Rica, and 7. puella to that lying between 
Southern Mexico and Panama. 
The genus Trogon, of which 1. viridis has been considered the type, has been much 
subdivided by various authors; but the characters are trivial, with the exception, 
perhaps, of Zroctes of Cabanis and Heine, represented by Trogon massena. This is a 
stouter form without white ends to the lateral rectrices, but these characters are hardly 
of sufficient importance to render any division of Trogon desirable. 
As in KLuptilotis the upper tail-coverts are comparatively short and do not extend 
nearly to the end of the rectrices, nor are the wing-coverts lengthened as in Pharo- 
macrus. ‘The central pair of rectrices are differently coloured in the sexes, those of 
the male being of some shade of glittering green, those of the female brown or slate- 
colour. 
The colouring of the lateral rectrices and of the females furnishes natural characters 
for the subdivision of the genus. 
A. Rectrices utrinque tres laterales plus minusve alto terminate. 
a. Femina supra brunnea aut rufo-brunnea. 
1. Trogon mexicanus. 
Trogon mexicanus, Swains. Phil. Mag. new ser. i. p. 440 (1827)'; Zool. Ill. ser. 2, tt. 82, 107°; 
Wagl. Isis, 1831, p. 523°; Gould, Mon. Trog. tt. 1, 2*; ed. 2. t.7°; Sel. P. Z. S. 1859, 
> 
* Of these we unite 7, awrantiiventris with 7’. puella and add Mr. Richmond's 7. chrysomelas, a species 
unknowa to us, 
