Seventeen-year Locust in 1846. 217 
they must have perished, for it remained over them five or six 
days. In their cells no appearance of excrementitious matter 
four feet in length. For constructing their cells and excavating 
these tubes, their fore feet are admirably adapted, being much lar- 
ger and stronger than those for locomotion, and formed with stout 
claws like the craw fish, as here represented enlarged. Fig. 1. 
Kach pupa is armed with a stout proboscis, one fourth er 
of an irich long, which usually lies between the fore 
legs on a line with the body. A remarkable example 
of instinct was observed in some which came to the surface un- 
der a pile of boards, raised by timbers five or six inches above 
the earth. The ground was wet, and to enable themselves to 
teach the dry boards they continued their cylinders up to them, 
forming thus towers of damp clay in the centre of which they 
Were concealed. ‘These towers were five or six inches high and 
about an inch in diameter; they were con- Fig. 2. 
structed of lumps of wet earth compacted 
together in a firm but rough manner. A 
diminished drawing of one of these is given 
in the annexed figure. A large number of 
these towers was found when the boards 
were removed ; some had the top closed, and 
from these the Cicada had not departed. When 
they had reached the boards, they crawled 
along on the under side, and came to the 
open air, where, fixing on a spot favorable to 
their purpose, they remained attached, until a 
Tupture was made in the cuticle on the back of 
the thorax, and the perfect insects then with 
great effort extricated themselves from the 
armour that had so long protected them in 
the earth. As there was no further use for 
came denizens of the air, these legs were re- 
had chosen their mates, and the female soon commenced deposit- 
ing her eges in the under sides of the tender branches of trees, 
by means of an ovi-positor, resembling an awl or punch, and 
continued at this for several days. ‘The preceding year’s growth 
. 
