980 MOTIONS OF INSECTS. 
slimy secretion, unaided by mandibular hooks, the ca~ 
terpillar of a little moth (Hepialus Testudo, F. Apoda, 
Haworth) moves from place to place*.—A subcutaneous 
larva belonging to the same order, that mines the leaves 
of the rose, moves also by tubercular legs assisted by 
slime. It has eighteen homogeneous legs, with which, 
when removed from its house of concealment, it will 
walk well upon any surface, whether horizontal, inclined, 
or even vertical’, But the greatest number of legs of 
this kind that distinguish any known larva, is to be ob- 
served in that of a two-winged fly (Sceva Pyrastri, ¥.) 
that devours the Aphides of the rose. This animal has 
six rows of tubercular feet, with which it moves, each 
row consisting of seven, making in all forty-two*.—The 
grub of the weevil of the dock (Curculio Rumicis, L.) has 
twenty-four tubercular legs; but, what is remarkable, 
the six anterior ones, being longer than the rest, seem to 
represent the real legs, while the others represent the 
spurious ones, of lepidopterous larvee. ‘These legs, how- 
ever, are all fleshy tubercles, and have no claws, the 
place of which is supplied by slime which covers all the 
underside of the body, and hinders the animal from fall- 
ing’, Another weevil (Lixus paraplecticus, F.) pro- 
duces a grub inhabiting the water-hemlock, which has 
only six tubercles that occupy the place and are repre- 
sentatives of the legs of the perfect insect &. 
Some larvee have these tubercles armed with claws. 
The maggot of a fly described by De Geer under the 
name of Musca plumata, but which Linné makes a va- 
riety of Syrphus mystaceus, ¥'., has six pair of them, each 
@ Klemann, Beitrage, 324, » De Geer, 1.447—. #. XA fol Ze 
© De Geer, vi. 111, abide 230. © Ibid. 228, 
