/ 
17 
Fig. 3. Corn root-worm. Larva of Diabrotica longicornis, Say. Magnified 
6 diameters. Head more highly magnified. Front view. 
Larva .—The corn root-worm, when fully grown, just previous to 
ts last moult, is four-tenths of an inch in length, by one-tentli 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- 
diirds as wide. as long, and smooth except for the hairs already 
nentioned. It is yellowish-brown, a little darker in front and at 
;he sides beneath. A narrow dark line extends along the middle of 
;he head, widest posteriorly, where it is divided by the very narow 
vhite suture, which forks at the middle, sending two narrow straight 
tranches to the anterior angles of the head. 
. Here the short, white, three-jointed antennae are situated, the first 
oint about twice as wide as the last, and the second joint very 
short. The eyes are wanting. The mandibles are dark with black 
i ips, and the other mouth appendages are white. The thoracic seg- 
nents all bear short, two-jointed 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, 
nembranous, oval appendage, which extends some distance beyond 
she tip of the claw. . The top of the first segment is coriaceous and 
mllowish-brown, while all the others are soft except the last, upon 
which is a circular brownish patch of leathery consistence. Beneath 
|7.his segment is a prominent retractile wart or tubercle, serving as 
i false leg. The segment is entire and rounded posteriorly, where 
t is set with a few long hairs or slender spines. 
