MODE OF <)Vl POSITION. 
11 
punc- 
wood, which is wider — ami thus causes the eggs to be further apart — 
at the bottom of the grooves than at their commencement. Tin- punc- 
tured twigs bear the appearance of Fig. 4, and frequently break « ff 
and die, though the great majority 
remain green and recover from their 
wounds. Indeed there is every reason 
to believe that the eggs seldom hatch 
in those twigs which break off ami 
become dry, but that the life and 
moisture of the twig are essential to 
the life and development of the egg, 
for the eggs are noticeably larger just 
before hatching than when first de- 
posited, showing that they are, to a 
certain extent, nourished by endosmo- 
sis of the juices of the living wood. 
Mr. Eathvon has also recorded the 
fact that the Cicada eggs are always 
shriveled in twigs that are amputated 
by the Oak primer (Stenocoms villas us, 
Fabr.). In the healing of the punc- 
tured parts a knot usually forms over 
eacli puncture, and I represent at Fig. 5 a portion of an apple twig, sent 
to me by Mr. John P. McCartney, of Cameron, Clinton County, Mo., and 
which was punctured in the year 1862. Though the wounds had so well 
healed on the outside, the grooves in side were not filled up, but still 
contained the miuute, glistening egg-shells, from which the young larva- 
had escaped six years before. 
The eggs hatch between the 20th of July and the 1st of August, or in 
about six weeks after being deposited. 
The newly-hatched larva (Fig. 6) dif- 
fers considerably from the full-grown 
larva, but principally in having much 
longer and distinctly 8-jointed anten- 
na?.* It is quite active, and moves its 
antennae as dexterously and as rapidly fk 
as does an ant. As soon as it has ex- 
tricated itself from an exceedingly tine membrane (the amnion), which 
still envelops it after it has left the egg,t our little Cicada drops delib- 
erately to the ground; its specific gravity being so insignificant that it 
falls through the air as gently and as softly as does a feather. 
Fig. 4.— Twij 
tared by the Seven- 
teen-vear Cicada. 
FIG. 5.— Twig healed 
after the puncture 
of the Seventeen- 
year Cicada. 
(i. — Seventeen-year Cicada. Newly 
hatched larva." (After Riley.) 
"There is frequently ;i ninth joint {tartly developed. 
* Most insects ha\ hag incomplete metamorphoses are enveloped in a like membrane 
after leaving the egg, and until this is thrown off the yonng insect is awkward in its 
motions. In the case <d' the yonng Cicada, these fine membranes are usually left 
attached to the roughened orifice of their nidus, and thus form, together, a white. 
glistening bunch. 
