504 
Mr. O. Sal Tin on Bird .* 
Pern, 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 he a very complicated 
undertaking and in many cases not at present possible ; but 
I estimate roughly that from 25 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 r —Xenopipo, Neopipo, Phccnicocercus,, Xipholena 7 
H&matoderus, Gymnocephalus , Gymnoderus , Rhopoterpe 7 
Topaza, Urogalba , Deroptyus , Nothocrax, Mitua, Opi&thoco- 
mus and Psophia* 
2. Venezuela, including Trinidad. 
Total number of Guiana species found in 
Venezuela .......... 176 
Less migratory species . . . . . .10 
sea-birds ......... 0 
— 10 
166 
or about 27-J 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 roraimcs, Chlorophonia roraimce , Caliiste whitelyi, 
Brachygalba lugubris, and Aulacorhamphus whitelyanus . 
