on various Species of Hymenopterous Insects. 125 
under the generic name of Hybonotus, merely observes—‘ Meta- 
morphosis ex parte nota; constat nempe larvam Siricum morem 
observare et Xylophagam esse—Noxa certe nulla, przesertim cum 
in arboribus, nonnisi putredine jam corruptis larvee inhabitent ’-— 
without adding any description of the larva itself. * 
The larva is a soft, cylindrical, white and fleshy grub, with a 
small head and twelve segments to the body. When at rest the 
head of the insect is nearly obscured by the first three segments 
of the body, which are larger than the others. (Pl. X. fig. 2, 
represents the larva at rest.) The head is placed much lower than 
usual, (thus resembling, as Mr. Cooper remarked, the position of 
the head of the perfect insect,) and is of a harder substance than 
the remainder of the body, and is furnished with a small upper lip 
rounded in front (labrum, Pl. X. fig. 9b); a pair of strong short 
upper jaws or mandibles, (fig. 9cc, and fig. 11,) each having 
three or four teeth; a pair of under jaws or maxille, which offer 
a rather remarkable peculiarity of structure, being composed of 
two parts, the inner (fig. 12 and 1300) fleshy and rather hairy at 
the interior margin, and the outer portion (fig. 12, 13aa) not 
longer than the inner, but having the rudiments of several joints ; 
there is also a large fleshy under lip (labium, fig. 9 and 12e), 
which does not appear to possess any appendage: the under jaws 
and the under lip are united at their base, and have one common 
motion. The rudiments of the antennz (fig. 9a, and fig. 10) are 
placed a little above the base of the mandibles and are very short, 
and formed of several small rings gradually lessening in size to 
the tip. I have not been able to discover any vestige of the eyes 
of the perfect insect. 
The first three joints of the body are, as I have before said, 
much larger and broader than the head or any other of the joints 
(except the last), ‘They appear very much wrinkled on their 
upper side when the insect is at rest (see fig. 2), but when in 
motion these wrinkles become inflated and form a smooth surface 
(see fig. 3). The under side of each of these three joints is 
furnished with a pair of very minute fleshy legs (fig. 4 and 5), of 
which, when in motion, the insect makes but little use, generally 
laying upon its side bent, as at fig. 2. Its motion is performed by 
stretching out the first three joints and then drawing the remainder 
of the body after them, similar to the motion of a worm. The 
next eight segments of the body are very nearly equal in size, and 
are without any vestige of feet, each being furnished with a pair 
* Monogr. Siric. Germ. p. 14. 
