CHAP. XV.] 
THE NEARCTIC REGION. 
133 
Oporornis, genera of wood-warblers, may be considered to be 
peculiar to this sub-region, since in each case only one of the 
two species migrates as far as Central America ; while two other 
genera of the same family, Siurus and Setophaga, as well as the 
finch genus, Euspiza , do not extend to either of the western 
sub-regions. Par us, a genus of tits, comes into the district from 
the north; Otocorys, an alpine lark, and Coturniculus, an American 
finch, from the west ; and such characteristic Nearctic genera as 
Antrostomus (the whip-poor-will goatsuckers) ; Helminthophaga, 
Dendroeca, and Myiodioctes (wood-warblers) ; Virto (greenlets) ; 
Dolichonyx (rice-bird) ; Quiscalus (troupial) ; Meleagris (turkey) ; 
and Ortyx (American partridge), are wide-spread and abundant. 
In Mr. J. A. Allen’s elaborate and interesting paper on the birds 
of eastern North America, he enumerates 32 species which breed 
only in the more temperate portions of this province, and may 
therefore be considered to be especially characteristic of it. 
These belong to the following genera : — Turdus , Galeoscoptes, 
Harporhynchus, Sialia, Dendrceca , Wilsonia, Pyranga, Vireo, 
Lanivireo, Lophophanes, Coturniculus , Ammoclromus , Spizella , 
Euspiza , Hedymeles , Cyanospizci, Pipilo, Cardinalis, Icterus , 
Conus, Centurus, Melanerpes , Antrostomus, Coccyz'us, Ortyx, and 
Cupidonia. 
Reptiles. — In this class the Eastern States are rich, possessing 
many peculiar forms not found in other parts of the region. 
Among snakes it has the genera Paranoia and Dimodes belong- 
ing to the fresh-water snakes (Homalopsidse) ; the South Ameri- 
can genus Elaps ; and 3 genera of rattlesnakes, Cenchris , 
Crotalophorus, and Crotalus. The following genera of snakes 
are said to occur in the State of New York : — Coluber, Tropido- 
notus, Leptophis, Galamaria, Heterodon, Trigonoeepkalus, Crotalus, 
Psammophis, Helicops, Bhinostoma, Pituophis, and Elaps. 
Among lizards, Chirotes, forming a peculiar family of Amphis- 
benians, inhabits Missouri and Mexico; while the remarkable 
glass-snake, Ophisaurus, belonging to the family Zonuridae, is 
peculiar to the Southern States; and the South American 
Splmrodactylus , one of the gecko family, reaches Florida. 
Other genera which extend as far north as the State of New 
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