68 
A technical description of the beetle is furnished by Dr. Horn in the 
Transactions of the American Entomological Society for 1893 (p. 129). 
DESCRIPTION OF THE EGG. 
The egg (fig. 1, f) is subfusiform in shape, twice as long as wide, and each end tapers 
to a large nipple, which is more prominent at one end than at the other. The color 
when fully matured is almost perfect orange, which is slightly darker toward the ends. 
The surface is nearly opaque, and rather thickly covered with small, rather deep, 
hexagonal pits, of which there appear to be thirty-two or three, rows in its entire 
length. Length, 0.70-0.76 ™™; width, 0.35-0.38 ™™, 
The larva is like that of Diabrotica, consisting of thirteen segments. 
It is nearly cylindrical in form, milk white when mature, with darker 
head and anal segment, fleshy, but not quite so delicate as that of D. 
vittata. From the latter it differs in being a little stouter proportion- 
ally when mature, and in certain obvious structural and other charac- 
ters. The younger iarve are of very nearly the same proportions as 
the full-grown ones of vittata. The full-grown larva is shown in the 
illustration at ¢ enlarged about six times. 
The following is a more detailed description: 
DESCRIPTION OF THE LARVA. 
Form subeylindrical, strongly convex above, somewhat flattened below, elongate, 
being when mature and extended in natural position seven or eight times as long as 
wide, tapering toward the head and toward the last segment. 
The texture of the body is soft, delicate, and fleshy, the surface less wrinkled, and 
the wrinkles not so deep as in Diabrotica. 
The general color is milk white, but is sometimes slightly yellowish, with the head, 
thoracic plate, anal segment, and legs darker. 
The head is rounded in outline, about a fourth wider than long, and the two hem- 
ispheres are separated posteriorly by a nearly semicireular space. The vertex is 
separated from the two hemispheres by two pale, narrowly defined and neaily straight 
sutural lines, which converge from near the insertion of the antenn and curve exter- 
nally toward the middle, forming a V-suture, with the angle just perceptibly wider 
than aright angle. At the middle they are joined by asimilar median fong longitu- 
dinal line which separates the hemispheres. The surface gives rise to a few rather 
strong hairs. The color above is dark brown, which becomes still darker in most 
individuals just before the median sutural line and particularly at the sides. The 
lower surface is pale. Antenne 3-jointed, pale. 
The first thoracic segment is twice as wide as long and somewhat less than twice 
as wide as the head. The thoracic plates are slightly corneous, very hight brown in 
color, and separated by a median longitudinal white line. The second thoracic seg- 
ment is wider than the first, and the third is wider than the second in about the 
same proportion, so that there is a gradual tapering from the first abdominal seg- 
ment toward the head. 
The legs are small, jointed, and more or less slightly infuscated. They are best 
described by the figure (see e). 
The first eight abdominal segments are less strongly separated and of nearly equal 
width and are not strongly rugose. The anal segment is considerably narrower than 
the preceding and irregularly rounded apically. Onits dorsal surface it bearsa brown 
corneous plate which is darker apically, but there is no trace of tubercles. On its 
ventral surface it bears a prominent teatlike proleg (see fig. 1, d). 
Length of mature larva: 7-8 ™™; width, 1-1.1™™. 
=_—" 
ee i i tn Eg er es Se ee 
_., | 
