28 
As no very good illustration of the-larva and pupa of this species 
has been published, occasion is taken to present the accompanying cut 
of the insect in its different stages, together with brief descriptions of 
the larva and pupa to facilitate their recognition. A few short notes 
are also added on the life history of the species. 
Description, life history, and habits.—To the late Dr. Hy. Shimer and 
to Dr. Asa Fitch we are indebted for our first accounts of the earlier 
stages and life habits of this insect. These accounts were published 
in the same year, 1865, but that of Fitch, which appeared in his Tenth 
New York Report (pp. 1-8), was by far the more complete. 
The egg does not appear to have been observed, but from analogy 
we may be certain that it resembles that of other Diabroticas. . 
The larva shown at b, fig. 7, 1s nearly cylindrical, narrowed ante- 
riorly, somewhat flattened ventrally, and very elongate, its length when 
mature about ten times its diameter. Compared with D. 12-punctata 
the surface is much less strongly wrinkled. The 
general color is milk white, the head and anal plate 
dark brown and corneous, the thoracic plate lighter 
brown and somewhat corneous; the tubercles on the 
dorsal surface of the body are more or less distinetly 
marked with light yellowish brown; the six thora- 
cic legs are infuscated, and the exterior margin of 
the cox are strongly marked with black. The 
head and thoracic plate and legs are best described 
by the accompanying figures (fig. 8, aand b). The 
anal segment with its retractile proleg is shown 
in profile at d, fig. 7. It terminates in two minute, 
FIG. 8—Larvaot Diabro. acutely pointed, upturned téeth. The length ofF 
tica vittata: a, head; b; the full-grown larva is about three-tenths of an 
leg— greatly enlarged ine) (7-8™™), the width three-hundredths of an inch 
(original). (0.7-0.8"™), 
The pupa, shown at ¢ (fig. 7), is of nearly the same color as the larva, 
its surface is sparsely beset with long spine-like hairs, those on the 
dorsal surface arising from small, but prominent piliferous warts. It 
is not impossible that we have in the 4rrangement of these hairs good 
specific characters, but no suitable material in other species is at hand 
for comparison. The apical hooks of the abdomen are slightly more 
slender and elongate than these appendages in D. 12-punctata. 
The larval period is passed in the earth, at the base of the stalks, 
and larve are often found within the stems above ground. This period, 
although probably never observed, has been stated to last for about a 
month, and there is an active stage of this duration in which the larve — 
working in numbers have ample time for injuring the vines. When fall 
grown, just before transformation, the larva becomes much contracted, 
having the appearance of being much stouter, as it is then only about 
Six or seven times as long as wide. Larve observed in July, 1897, 
