82 REPORT UNITED STATES ENTOMOLOGICAL COMMISSION. 
feeling themselves at home wherever they stop, they follow out their 
desire tor reproduction. 
Our data in reference to the local flights of other locusts are not suffi- 
cient to admit of comparison in this respect with what is known of C. 
spretus. 
We notice here a few statements by travelers and others in reference 
to local movements of other species, but they throw little light on the 
subject now under discussion. J. Morier, 180 while at Smyrna, in the 
months of July and August, observed somewhat carefully the locusts 
which had hatched out very abundantly there that year (1800). We 
judge from his very brief description that the species was A.percgrinum. 
He remarks: "It was now completely evident that their devastations 
were to curse the land. They remained until July and August upon 
the fields, driven now inland, now ocean wards by the winds; laid their 
eggs in the autumn, and destroyed, when the corn was already growing, 
by preference, the cotton, mulberry trees, and fig trees." 
The great swarm which entered Germany in 1093 produced successive 
broods for three years before they entirely disappeared, affording Ludolph 
an opportunity of studying their habits, of which he, several years after- 
wards, gave an account. 181 In this he speaks of their passage from one 
part of the empire to another, corresponding to the movements of C. 
spretus, which we term "local flights." But they deposited eggs and 
continued to reproduce until 1090 before disappearing. 
In the great irruption of 1748-1752 their movements were somewhat 
different, as the resulting broods continued to press on westward. 
2. DISTANCE A SWARM MAY TRAVEL IN THE COURSE OF ITS MIGRA- 
TIONS. 
In reference to migrations two extremes have been maintained by 
entomologists and other writers on the subject, which may be well shown 
by the following extract from Kefferstein's paper: 
It is usually held, and Fabricius himself says, that the Gryllus migratoriuss dwells 
properly in Tartary, and issuing from thence in great masses comes iu his migrations 
even to Germany and lays waste everything here; but when we consider the immense 
distance which this insect must pass over from the plains of Tartary in order to reach. 
Germany, crossing rivers and mountains, as compared with the very short period of 
existence of the mature insect whose end is merely propagation, in order to die upon 
the completion of this life task, it is clear that the assumption of the migration from 
Tartary into Germany is an empty hypothesm resting only upon the fact that the G. 
migratorius is found abundantly in Tartary. Moreover, we have never, according to 
any existing observations on the subject, been able to follow any locust swarm back 
from Germany into Tartary. Of the same opinion is also Schrank ; and this acute 
naturalist believes that the locusts wherever they show themselves destructive were 
there likewise born. 
He then proceeds to illustrate by reference to the appearance of locusts 
at various points in Europe, where he contends they originated, even 
180 Second journey, 99, 100. 
"'Beschreibung von allerlei Inaecten in Deutchland. Berlin, 1730. Th. 9, p. 6. — Kefferstein. 
