103 FIRST ANNUAL REFORT OP 



lighter. Indeed in some instances it becomes almost as pale as that of I), juncta. I saw a num- 

 ber of such p:ile Individuals among the late broods of last summer, though I had never seen them 

 so pale before, notwithstanding I have witnessed greatnumbers of them every year, since 186.3. 



Doryphoka juncta, Germar. — Mature larva. — General color a pale yellowish flesh-color. Head 

 bright gamboge-yellow, with the antennae placed behind the base of the mandibles, short and very 

 robustly conical, three-jointed, joints 2 and 3 black. Precisely as in 10-lineata, there are six small 

 simple black eyes upon each side, one pair longitudinally arranged and placed below the antenna* 

 the other two pairs arranged in a square and placed a little above and behind the antenna ; tip of 

 l he mandibles black. Body, with the dorsum of joint 1 composed of a separate transverse horny 

 pliite, rounded at the sides, of a rich shiny vandyke-brown, with the edges somewhat raised, and 

 jet black and with a fine line of a lighter color running through the middle from the posterior to 

 the anterior edge. Joints 1 — 3 each, with a lateral horny black tubercle, that of joint 1 placed 

 below and behind the horny prothoracic plate, and enclosing a spiracle. Joints 4—11 each with a 

 similar lateral tubercle enclosing a spiracle ; but the row composed of these eight tubercles is 

 placed a little above the row of three tubercles on joints 1 — 3, and the last four of the eight are 

 gradually smaller and smaller, until that on joint 8 is reduced to a simple black spiracle. Legs pale 

 yellow ; coxa; exteriorly dark brown, the two hinder pairs each more and more so, with a geminate 

 horny plate above each, which becomes more and more brown in each successive pair. An exterior 

 dusky dot, or small spot, on the tip of the femur and of the tibia. Tarsus small, one-jointed, 

 brown, and with a black claw. 



The body has a distinct translucent dorsal heart-line, and has usually a shade of the same color 

 both above and below the lateral row of black tubercles ; while there are two transverse dark- 

 brown bands across the extreme tip of the body, which is used as an anal proleg. This larva, when 

 well fed, is very smooth and swollen, though it soon becomes wrinkled after fasting. The pink 

 tint of the body is more intense on the neck and between the legs. 



Now let us see what are the differences in the perfect beetle state 

 of these two insects, in which state even a practised entomologist 

 would, at first sight, be apt to confound them together. Indeed, so 

 minute are the differences, that in a drawing of the natural size, it is 

 scarcely possible to exhibit them, but with the greatly enlarged leg 

 and wing-case of each species, which are given in the foregoing figures 

 we shall readily be enabled to do so. Figure 46, d, d, exhibits the true 

 Colorado Potato-beetle ; Figure 47, c, the bogus Colorado Potato-beetle, 

 each of its natural size. Figure 46, e, shows the left wing-case enlarged, 

 and Figure 46, f, an enlarged leg of the former; Figure 47, a, the left 

 wing-case enlarged, and Figure 47, e, an enlarged leg of the latter. 

 On a close inspection it will be perceived that in the former (Fig. 46, 

 e) the boundary of each dark stripe on the wing-cases, especially to- 

 wards 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. 47, <#), or the contrary, the dark stripes are 

 accurately edged by a single regular row of punctures placed in a 

 groove (stria); it is the second and third stripes— not the third and 

 fourth — counting from the outside, that are united behind, the space 

 between them being almost always brown; and the leg is entirely 

 pale, except a black spot on the middle of the front of the thigh. 



The spots on the thorax, in either of the above two species, are 

 normally eighteen in number, arranged in the same very peculiar 

 pattern which may be seen both in Figure 46, d,d, and inFigure47, c; 

 and precisely the same variations in this complicated pattern occur in 

 either species. 



