TROGON CITREOLUS, Gould. 
Mas. Trog. vertice, collo, dorso, guttureque ccerulescenti-viridibus; rectricibus duabus intermediis 
ad apicem, proximarum duarum utrinque pogoniis internis, reliquisque ad basin nigris, his 
apicem versus albis; ventre citrino in aurantiacum vergente; alis brunnescenti-nigris, rectri- 
cum pogoniis externis albo jimbriatis ; rostro ccerulescenti-corneo; pedibus brunneis. 
Foem. Capite, gut lure, dorsoque saturate cinereis ; rectricibus sex intermediis brunnescenti-nigris ; 
in cceteris mart simillima. 
Male. Crown of the head, neck, back and throat bluish green; tips of the two middle tail- 
feathers, the internal web of the two next on each side, and the base of the remainder black, 
the rest of each feather white; abdomen lemon-yellow passing into orange; wings brownish 
black, the outer webs of the primaries fringed with white; bill bluish horn colour; feet 
brown. 
Female. Head, throat and back dark grey; six middle tail-feathers brownish ; in other respects 
the same as in the male. 
Total length, 101 inches ; bill, 1; wing, 5i ; tail, 6 ; tarsi, I. 
Trogon citreolus, Gould in Proc. of Zool. Soc. Part III. 183.5, p. 30. 
This interesting and very rare Trogon is a native of Mexico, and may be distinguished from all other known 
species by the delicate lemon-yellow of the under surface, by the greater extent of the white on the lateral 
tail-feathers, and by the uniform colouring of the central portion of the' wing. 
The birds figured in the accompanying Plate are an immature male, and an adult female. When more 
fully adult, the male has the whole of the head, neck, chest, and upper surface of an uniform rich green. 
The specimens from which the above description and the figures are taken form a part of the collection of 
the Zoological Society, in which are also contained nearly all the species represented in the present Mono- 
graph. 
