i? 
Fig. 3. Corn root-worm. Larvaof Diabrotica longicornis, Say. Magnified 
6 diameters. Head more highly magnified. Front view. 
Larva.—The corn root-worm, when fully grown, just previous to 
its last mouit, is four-tenths of an inch in length, by one-tenth that 
width, white and smooth under a low power; but when more highly 
magnified, the skin is seen to be minutely roughened with very 
small tubercles. The body is cylindrical, narrowing a little anteri- 
orly, the first segment being the shortest and narrowest of all. 
There are a few scattered stiff hairs to each segment, most numer- 
ous anteriorly, and especially upon the head. ‘The latter is nar- 
rower than the first segment, convex but flattened above, about two- 
thirds as wide as long, and smooth except for the. hairs already 
mentioned. It is yellowish-brown, a little darker in front and at 
the sides beneath. A narrow dark line extends along the middle of 
the head, widest posteriorly, where it is divided by the very narow 
white suture, which forks at the middle, sending two narrow straight 
branches to the anterior angles of the head. 
Here the short, white, three-jointed antenne are situated, the first 
joint about twice as wide as the last, and the second joint very 
short. The eyes are wanting. The mandibles are dark with black 
tips, and the other mouth appendages are white. The thoracic seg- 
ments all bear short, two-joimted legs, each about as long as the 
segment to which it is attached. They are pale brown, armed with 
short, stout spines, and terminating in a single claw and a flattened, 
membranous, oval appendage, which extends some distance beyond 
the tip of the claw. The top of the first segment is coriaceous and 
ellowish-brown, while all the others are soft except the last, upon 
which is a circular brownish patch of leathery consistence. Beneath 
this segment is a prominent retractile wart or tubercle, serving as 
a false leg. The segment is entire and rounded posteriorly, where 
it is set with a few long hairs or slender spines. 
