330 
WISCONSIN STATE AGRICULTURAL SOCIETY. 
head is of a pale color, the first joint behind the head is tinged 
with dusky and edged all round with black, there is but a 
single row of black spots along the side of the body, and the 
legs are pale. Take a hundred full-grown specimens of the 
former larva, and you will find them all to present the above 
characters. Take a hundred full-grown specimens of the lat¬ 
ter larva, and precisely the same rule will hold good. 
Now let us see what are the differences in the perfect beetle 
state of these two insects, in which state even a practiced 
entomologist would, at first sight, be apt to confound them 
Fig. 45 . 
Colors—(a) between cream and flesh colors; ( b ) flesh color; (c and d ) cream color, black 
and brown. 
together. Indeed, so minute are the differences, that in a 
drawing of the natural size it is scarcely possible to exhibit 
them, and in order to do so we have been compelled to greatly 
magnify the wing-cases and the leg of each species. Figure 
44 c?, d , exhibits the true Colorado potato bug; Fig. 45 c the 
bogus Colorado potato bug, each of its natural size. Fig. 44 e 
shows the left wing-case enlarged, and Fig. 44 / an enlarged 
leg of the former; Fig. 44 d the left wing case enlarged, and 
Fig. 45 e an enlarged leg of the latter. On clo3e inspection 
it will be perceived that in the former (Fig. 44 e) the boundary 
of each dark stripe on the wing-cases, especially towards the 
middle, is studded with confused and irregular punctures, 
partly inside and partly outside the edge of the dark stripe; 
that it is the third and fourth dark stripes, counting from the 
outside, that are united behind; and that in the leg both the 
knees and the feet are black. In the latter (Fig. 45 d,) on the 
