BIRDS OF SOUTHWESTERN MEXICO. 9 



in the province of the Pacific. M. lessoni and Eumomota superciliaris 

 occasionally appear; but they are considered to be wanderers from the 

 province of me Gulf, where Mylomanes momotula also occurs. 



" The resident species of Picidce, on the plains of the Pacific, are 

 Cainpephilus guatemalensis, Dryotomus scapularis^ and Centurus aurifroyis. 



" The genera Geotrygon, Lepidcenas, and Talpacotia, of the eastern 

 coast, are not found on the western shore of the isthmus. 



"A species of Ortyx {0. coyolcos) represents the family of the Per- 

 dicidcB on the plains of the Pacific, which, in the eastern province, on the 

 contrary numbers several representatives. 



" The specimen of Tinamus sallcei in my collection comes from Santa 

 Efigenia, a spot which may be considered as extra-isthmique. 



" Notwithstanding my assiduous researches, I have been unable to 

 meet with but a single representative of Bendrocolaptidce, Bendrornis 

 ehurneirostris. 



" GhiroxipMa linearis in my collection comes from Santa Efigenia. 



" In exchange for the numerical inferiority in regard to the above- 

 mentioned families, we observe a greater development in those of the 

 Sylviidw, and perhaps also of the Tyrannidce, particularly the genera 

 FoUoptila and Myiarclms. The eastern coast of Mexico has furnished, 

 up to this time, but a single species of Polioptila (P. cwrulea), and, 

 moreover, it probably only resides there in winter; on that of the Pacific 

 we find, besides the preceding, two species with a black head, P. nigri- 

 ceps and P. alhiloris, both indigenous. Myiarclms lawrencii is the only 

 species of the genus which can be called common on the coast of the 

 Gulf of Mexico. On the opposite shore, the Myiarchi are abundant, and 

 are dispersed almost everywhere in the forests and on the plains. 



"The following table, although very incomplete, will give a sort of 

 parallelism of the most characteristic species of each of the two orni- 

 thological regions of the isthmus. 



"C6te orientalb. 



-' Turdus grayi. 



" Campylorliynchus zonatus. 



" Thryothorus macuUpectus. 



" Granatellus sallcei. 



" Hcemophila rufescens. 



" Cyanospiza parellina. 



" Cassiculus prevosti. 



"C6te occidentale. 



" Turdus flavirostris. 

 " Campylorhynchus humilis. 

 " Thryothorus pleurostictus. 

 " Granatellus venustus. 

 " Hcemophila ruficauda. 

 " Cyanospiza leclancheri. 

 " Cassiculus melanicterus. 



