594 



MESSRS. SCLATER AND SALVIN ON 



[May 23, 



Accipitres, Grallse, &c., which are mainly hirds of wide distribution, 

 many of them extending over the whole neotropical region. Having 

 deducted these 96 we have left a residuum of 144 of more local 

 character as regards their range, an examination of which will at 

 once solve the question to which of the great zoological divisions of 

 South America the district of the Lower Amazons pertains. 



Of these 144 species not less than 88 (or Gl per cent.) are identical 

 with species found in Cayenne, either belonging to forms peculiar to 

 the Guianan province, or, if occupants of a more extended area, 

 ranging westward and north-westward into the Upper Amazons or 

 Venezuela, New Granada, and Central America, but not extend- 

 ing southward into the wood-region of South-eastern Brazil. Not 

 only is this Guianan element noticeable for its numerical extent in 

 species, but also as exhibiting such well-marked forms as Pifhi/s, 

 Phcenicocercus, Hcematoderiis, Querula, Urogalha, Jacamerops, Opis- 

 thocomns, and Psojihia, all of which are quite foreign to the wood- 

 region of South-eastern Brazil. The Guianan facies of the Para 

 district is further shown hy an examination of the instances in which 

 the two provinces of Guiana and South-eastern Brazil are occupied 

 by corresponding representative forms. In almost every case the 

 Para form, when ascertained, is found to belong to the Guianan and 

 not to the Brazilian species. In the subjoined table, of fourteen 

 instances of this sort, it will be noted that th^re is only one positive 

 exception to this rule. In two other cases both Guianan and Bra- 

 zilian species occur within the Para district, and the River Amazons 

 appears to form the boundary between fiiem, the Guianan species 

 being found on the north bank and the Brazilian on th? south*. 



Cayenne. 



1. G. sequinoctialis . 



2. C guianensis .. 



3. T. episcopus .. . 



4. P. viridis 



5. E. macriunis 



6. I. cayanensis .... 



7. C. anthoides .... 



8. F. pica 



D. E. olivus 



10. G. viridis 



11. C. tenebrosa . 



1 2. P. ara^ari 



1.". R. vitellinus . 



14. C. ilavigularis 



Paii.v district. 



Geotliljpis a;quinoctialis 



Cycloi'his guianensis 



Tanagra episcopus 



Pitylus viridis 



Emberizoides macruru.s, var. 



Icterus cayanensis 



Cory thopis anthoides 



Fluvicdhi oDiivcntris 



Empidoclianes olivus 



f Galbula viridis 



\ riifo- mridis 



Chelidoptera tenebrosa 



Pteroglossus ara<,-ari 



Eaniphastos ariel 



vifcUirtus 



Chloronerpes flavigularis 



Bkazil. 



G. velata. 

 C. ochrocephala. 

 T. cyanoptera. 

 P. brasiliensis. 



E. sphenurus. 

 I. tibialis. 



C. calcarata. 



F. albiventris. 

 E. fuscatus. 



G. rufo-viridis. 



C. brasiliensis. 

 P. tnirdi. 



R. ariel. 



C. erythropis. 



* The River Amazon probably divides the range of the following species: 

 Pjpra jlin'irollis from 7'. av.renla. 

 Xiphnlnui /amel/ipnw/s from A', jioniparhn-a. 

 Galbula nifo-viridis from (r. viridis. 

 Vrogalha amazonvm from V. parndisca. 

 Biicco liyprrrlpirhiifi from B. marrdrhyni-hnn. 

 Thaluravia furcafnides from T. f areata. 

 Ca/iipi/lopfrru.^ oh,snirus from C. fair/iponiis. 

 Bdaiphasfos vifcllimi.^ from li. arid . 

 Psiipliia (ii'sr-}/ra from I', rrrpifa)!^^. 



