298 MOTIONS OF INSECTS. 
scend the animal unfolds it, and by sudden strokes 
which she gives with it and her anal swimmers to the 
water, she swims, to the right and left as well as down- 
wards, with as much ease as the larva?. 
Bonnet mentions a pupa which climbs up and down 
in its cocoon,—and that of the common glow-worm 
(Lampyris noctiluca, L.) will sometimes push itself along 
by the alternate extension and contraction of the segments 
of its body>.—Others turn round when disturbed. That 
of a weevil (Curculio Arator, L.), which spins itself a 
beautiful cocoon like fine gauze, and which it fixes to the 
stalks of the common spurrey (Sagina arvensis, L.), upon 
my touching this stalk, whirled round several times with 
astonishing rapidity——The chrysalis of a scarce moth 
(Bombyx dispar, F.) when touched turns round with 
great quickness ; but, as if fearful of breaking the thread 
by which it is suspended by constantly twisting it in one 
direction, it performs its gyrations alternately from left 
to right, and from right to left®*. Generally speaking, 
quiescent pupze when disturbed show that they have life, 
by giving their abdomen violent contortions. 
But the most extraordinary motion of pupe is jump- 
ing. Inthe year 1810 I received an account from a 
very intelligent young lady, who collected and studied 
insects with more than common ardour and ability, that 
a friend had brought her a chrysalis endued with this 
faculty. It was scarcely a quarter of an inch in length ; 
of an oval form; its colour'was a semitransparent brown, 
with a white opake band round the middle. It was found 
2 De Geer, vi. 308. > Thid. iv. 43, 
© Dumeril, Trait. Element. ii. 49. n. 603. 
