1056 The American Naturalist. [December, 
Illinois. I could not pereeive any very decided southern features of 
fauna or flora at Campbellsville and Greensburg, near the headwaters 
of Green River. At Bowling Green and Glasgow Junction the south- 
ern character is decided. At Elizabethtown, farther north and east, 
the fauna and flora do not appear to be very different in relative 
-abundance of species from those of the region about Lexington. The 
eastern limit of the northward extension of the Austroriparian region 
would thus appear to follow approximately the meridian marking the 
86th degree of longitude west from Greenwich, and accompanies a fall 
in altitude to about 500 feet above sea level, the blue-grass region to 
the eastward being in the neighborhood of five hundred feet higher 
than the region west of Leitchfield. This western region is marked 
not only by an increased abundance of southern Orthoptera, but 
quite as decidedly by its other insects, its plants, and its vertebrate 
animals. Among Lepidoptera, Callidryas eubule and Euthisanotia 
tamais become noticeable. The water moccasin (Ancistrodon piscivor- 
us) and the shining bass (Centrarehus macropterus) appear. There 
is a decided increase in the numbers of such birds as the tufted tit- 
mouse, summer redbird and scarlet tanager. 
* We find here the spider-lily (Hymenocallis occidentalis), the Amer- 
ican aloe (Agave virginica), the willow oak (Quercus phellos), the 
water-locust ( Gleditschia aquatica) and the Mississippi hackberry ( Cel- 
tis mississippiensis). 
“Among the Orthoptera found in this end of the State two are 
worthy of special mention because their occurrence is in some respects 
exceptional. Mestobreyma cincta is recorded by collectors from Colo- 
rado and Wyoming. Dr. Cyrus Thomas obtained examples from 
Southern Illinois. I recently collected specimens at Glasgow Junction 
and Bowling Green in this State. I have no record at hand relating 
to its occurrence in regions between these widely separated eastern and 
western habitats. The second species is Pezotettix differentialis, the 
Fic. 1. Pezotettix differentialis. After Riley. 
large olive grasshopper so common in the northwest. It appears to be 
one of a relatively small number of northern species whose distribu- 
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i ' vsu mum e ese 
