MEETING-POINT OF THE THREE SUB-REGIONS. 
67 
Pallas asserts the C. itaUcus extends not only to the Crimea, but 
beyond the European boundary even to the Irtish ; thus invading the 
area of P. migratorius. Dr. Clark, who traveled over the northern part 
of this debatable section, remarks that the locusts — 
Consisted of two species, Gryllus tartaricus and the Gryllus migratorius, or the commou 
migratory locust. The first, almost twice the size of the second, because it precedes 
the other, bears the name of herald or messenger. The migratory locust has red legs 
and its inferior wings exhibit a lively red color. 
His G. tartaricus is evidently P. migratorius, and his 0. migratorius the 
€. italicus. 
Mebuhr and Forskal speak of two migratory species being found in 
Arabia, Persia, and Syria, one of which, judging from their notices, is 
certainly A. peregrinum, which prevails almost to the exclusion of the 
others in Arabia and Southern Persia. 
Palgrave notices the distinction between the species found in the 
south and north part of this region. Burkhardt mentions the fact of 
there being more than one species. It is now also well known, as as- 
serted by Eev. William Houghton, in the able article "Locust," in Smith's 
Bible Dictionary, that both P. migratorius and A. peregrinum occur in 
Syria, Arabia &c, but we are inclined to think the former comparatively 
rare in Central and Southern Arabia. 
From these notices, which might be multiplied, it is evident, notwith- 
standing the confusion and manifest errors, that more than one species 
of migratory locusts visit this southern portion of Asia, or meeting- 
point of the three faunal subregions. This is precisely what was to be 
expected upon the theory we are presenting in reference to the distri- 
bution of the three principal migratory species. Nor should the fact be 
overlooked that the southern district of Wallace's Mediterranean sub- 
region extends eastward to the confines of India, where, as we have seen, 
it is probable that A. peregrinum is the migratory species. The reader 
will also note the close agreement of Major Moore's and Salt's state- 
ments with this theory. 
It would be interesting to extend this examination to the locusts of 
the southern hemisphere, but this would require more space than we 
can devote to these collateral points ; moreover, our data are not sufficient 
to render such an examination satisfactory. Let it suffice for us to state 
that from the meager data we have been able to obtain we are led to 
believe that the Australian and New Zealand locust or locusts (if dis- 
tinct) are (Edipodsean and somewhat closely allied to P. migratorius; 
that the one which devastates Southern Africa is possibly A. peregrinum 
or some other species of Acridium ; that there is probably but one mi- 
grating species of South America, A. paranense, which is closely allied 
to A. americanum. If we are correct in these conclusions, we are justi- 
fied in stating, in general terms, that each species of migratory locust 
s confined, in its permanent distribution, to its own faunal region or 
