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When collecting the larve in May, I often observed 
same places grubs of the Cotalpa of at least four dis 
ages, each representing a year in the life of the in 
judging from Renny’s figures of the larve of the Em 
Cockchafer, or Dor-beetle ( Melolontha vulgaris). But 
English chafer becomes an imago in January or Feb 
and comes forth into active life in May, just four years | 
the deposit of the egg. Supposing our Cotalpa to take 
the imago form in autumn, and to spend its life from 
time to the next May in the ground, it would be five) 
old when it makes its debut as an arboreal insect. 
The books tell us that the larvee of the Coleoptera alms 
lie on their side. Why? Watching the movements 
Goldsmith in its chamber, I noticed that the cell, 0 
was made large enough to admit of considerable free 
respects allotted space; also by the curved motio 
made, the enlarging and keeping up the walls of its 
chamber. The dog, in setting itself for repose, $M 
old instinct, —first the whole body is put in a curvy 
circular motion is made, then it sinks upon its bed. 
the wolf making its bed. And this posture of reps i 
effectually defends the abdominal, the weaker parts 
body. It is so with the grub. Resting on its sié 
fact rests upon the ends of the hard dorsal segments, 
extension and ċontraction of which the cycloidal j3 
attained, without any friction to the tender abdome, 
the friction of the back keeps the walls of the eart 
compact and smooth. w 
I laid a large larva on my study-table. It instantly 
on its round, smooth back, nicely balanced itas , 
feet upward, moved quite rapidly. One 
movement serpentine. In fact, the motion was be 
the separating and bringing together agam a 
segments, very much as the ventral bands oF 
