504 Mr. O. Salvin on Birds 



Peru, and Bolivia which belong more properly to the valleys 

 of the tributaries of the Amazons rather than to the countries 

 to which they are assigned would be a very complicated 

 undertaking and in many cases not at present possible ; but 

 I estimate roughly that from 35 to 30 per cent, of the species 

 common to Guiana and the Amazons region do not extend 

 beyond their limits. Amongst these are several peculiar 

 forms which show the close connection subsisting between 

 the two countries. The following genera are thus re- 

 stricted : — Xenopipo, Neopipo, Phcanicocercus, XipJiolena, 

 Hamatoderus, Gymnocephalus, Gymnoderus, Rhopoterpe, 

 Topaza, Urogalba, Deroptyus, Notliocrax, Mitua, Opisthoco- 

 tnus and Psophia. 



2. Venezuela^ including Trinidad. 



Total number of Guiana species found in 



Venezuela 176 



Less migratory species 10 



sea-birds ......... 



— 10 



166 



or about 27^ per cent, of the 589 Guiana species. 



The ornithology of Venezuela has been less systematically 

 worked than many other parts of South America^ and for 

 this reason^ doubtless, the number of birds of the Guian 

 list found in Venezuela does not exceed 176. 



The number of species peculiar to Guiana and Venezuela 

 seems to be quite small, I can only recognize 6 or 7; of 

 these Chasmorhynchus variegatus and Thyrorhina schomburgki 

 are the most important. 



But there is another Venezuelan element that must not be 

 overlooked — that is, the evident relationship of a few of the 

 endemic Guiana species to allied forms of Venezuela to the 

 exclusion of other parts of America. Of these I may mention 

 Turdus roraimce, Chloroplionia roraim(B, Calliste whiteiyi, 

 Brackygalba lugubris, and Aulacorhaniphus whitelyanus. 



