30 



Trogon AMBiGuus. Trog. cwpite guttureque n'tgris ; pectore, 

 cervice, dorso, caudceque tectricibus superioribus viridibus ; alls 

 brunneo-nigris, in medio cinereis lineis gracilibus Jlexuosis trans- 

 versim notatis ; rectricibus duabus intermediis proximarumque 

 duarum utrinque pogoniis exlernis cupreo-viridibus, harum pogo- 

 niis internis omniumque apicibus nigris, reliquis ad basin nigris, 

 ad apicem albis, in medio albis maculis parvis numerosis sparsis 

 nigris. 



Long. tot. 12 unc; alee, 5^; caudle, 7-i-. 



Rostrum flavum : tarsi brunnei. 



Hab. in Mexico in plagis Septentrionalibus. 



This Bird is very nearly related to Trog. elegans, a species cha- 

 racterized by Mr. Gould at the Meeting of the Society on April 8, 

 1834, (Proceedings, Part II. p. 26). It differs by having the outer 

 tail-feathers obscurely and finely dotted, while in Trog. elegans they 

 are marked by strong and well-defined bars; and by having the mid- 

 dle of the wing much more finely and minutely barred than the latter 

 bird. These distinctions, although apparently trivial, having been 

 observed by Mr. Gould in many specimens, and the individuals seen 

 by him of T'rog. ambiguus having been brought exclusively from 

 the northern, while those of Trog. elegans have all been collected in 

 the southern states of Mexico ; he is induced to regard the two Birds 

 as being, very probably, specifically distinct. 



Trogon citreolus. Trog. vertice, collo, dorso, guttureque cceru- 

 lescenti-viridibus ; rectricibus duabus intermediis ad apicem, 

 proximarum duarum utrinque pogoniis internis, reliquisque ad ba- 

 sin nigris, his apicem versus albis ; ventre citrine in aurantiacum 

 vergente; alls brunnescenti-nigris, rectricum pogoniis externis 

 albo jimbriatis. 



Focm. Capite, gutture, dorsoque saturate cinereis; rectricibus sex 

 intermediis brunnescenti-nigris ; in cceteris mart simillima. 



Long. tot. 10-J- unc; alee, 5\\ caudce, 6 ; rostri, aricta ad apicem, 1. 



Rostrum ccerulescenti-corneum. 



Hab. 



This species differs from Trog. violaceus by its smaller size, the 

 lighter colour of its under surface, and the great extent of the white 

 at the ends of the outer tail-feathers. 



Mr. Owen commenced the reading of a Paper " On the com- 

 parative Osteology of the Orang and Chimpanzee." He stated that 

 he was indebted to Mr. Walker for the opportunity of examining 

 and describing in detail the skeleton of an adult Chimpanzee, ob- 

 tained by that gentleman a few years since from the west coast of 

 Africa, which had enabled him to compare it with that of the young 

 animal. This comparison evidenced in that species a series of changes^ 

 in the advance towards maturity, analogous to those which take 

 place in the Orang and the Pongo, and consequently afforded a strong 

 confirmation of the opinion which regards the latter animal as the 

 adult of the former. 



