DISTRIBUTION OF THE BIRDS OF VERA CRUZ. 



561 



sociabilis, Falco femoralis, etc., Myderla americana (I have found this beautiful species near 

 Cosamaloapam), Caneroma cochlear la, Agamla plcta, Tigrlsoma Uneatum, etc. 



This identity of species is found, though to a less degree, among the reptiles ; among the 

 Ophidians, Crotalus durlssus Linn., Bothrops atrox, Lachcsis mvtus? Oxybelfa acuminatus, Herpe- 

 todryas Boddlerlll, Leptodeira annuhta, Imantodes cencoaail ; among the Batrachians, Bufo agua, 

 Hgla lichenosa, Hyla Band/mi [fide Gunther, Catal). The saurians of the hot region, so 

 far as I know, present no such cases, but they contain several exclusively neotropical gen- 

 era, e. g., Iguana, Baslllscus, Lcemanctus, Ameiva. The presence of the genus Crocodilus in this 

 region, and the numerical superiority of the Chelonians, are also strongly characteristic. 



Temperate Eegion. 



This region is not so well characterized as that to wdiich we have just referred, and it is 

 in many cases difficult to distinguish the one from the other in an absolute manner. Its 

 productions, both animal and vegetable, present a mixed physiognomy which render their 

 geographical distribution uncertain, or at least quite difficult, and it is upon negative char- 

 acteristics, that is to say, the absence rather than the presence of certaiu forms, that we 

 must rely for characterizing its peculiarities. Yet positive characters are not entirely 

 wanting, as will be proved by the following list of species, all of which have their principal 

 centres of propagation within the limits which I regard as fixing the temperate region : — 



Catharus mexieanus. 

 Harporhynchus longirostris. 

 Melanotis caerulescens. 

 Sialia azurea. 

 Campylorhyneus zonatus. 

 Basileuterus culicivorus. 



rurifrons. 



Bellii. 

 Euthlypis lacrymosa. 

 Neochloe brevipennis. 

 Cyclorliis flaviventris. 

 Vireolanius mclitophrys. 

 Myiadestes unicolor. 

 Buarremon albinucbus. 



Pyranga bidentata. 



erythromelasna. 

 Chrysoniitris mexicana. 



notata. 

 Airnophila rufescens. 

 Icterus Audubonii. 



nielanocephalus. 

 Quiscalus Sumiohrasti. 

 Cyanocitta ornata. 

 Tyrannus vociferans. 

 Mitrephorus phceocercus. 

 Pionus senilis. 

 Aulacoranipbus prasinus. 



The Planus senilis does not, properly speaking, belong exclusively to the temperate region. 

 It is, on the contrary, quite common in the hot region ; but the fact that it is the only one 

 of the Pslttacldce to be found near Orizaba, has induced me to include it here. 



In certain localities the Am milltaris may also be met with in the temperate region, but 

 I do not think it breeds there. 



Alpine Region. 



Catharus occideutalis. 

 Hylociclila Audubonii. 

 Planesticus migratorius. 

 Turdus pinicola. 

 Cinclus mexicanus. 

 Sialia mexicana. 

 Lopbophanes Wollweberi. 

 Parua meridionalis. 



MEMOIRS BOST. SOC. NAT. HIST. Vol. I, Pt. 4. 



Psaltriparus melanotis. 

 Sitta carolinensis. 



pygra«a. 

 Certbia mexicana. 

 Campylorhynchus pallescens. 

 Troglodj tes brunneicollis. 

 Parula superciliosa. 

 DendrcEca olivacea. 



141 



