t 
group, but we never found less than that number. The egg itself is 
oblong oval, obtusely, but not abruptly, pointed at tip, of straw-yellow 
color, its surface being opaque and beautifully and evenly reticulated, 
each mesh forming a regular hexagon, as shown, highly magnified, in 
Fig. 17. The form of the eggs is not quite constant, some of them, 
especially those in the middle of a large group, being much narrower 
than others. The duration of the egg state is about one week. 
The general shape of the larva is very elongate, almost cylindrical, and distinctly 
tapering posteriorly in the early stages, but less convex and of nearly equal width 
whenmature. The general color of the young larva is yellowish-black, with the black 
markings comparatively larger and more conspicuous, and with the hairs arising 
from these markings much longer and stiffer than in the full-grown larva. With 
each consecutive molt the yellow color becomes more marked, the black markings of 
less extent and of less intense color, and the hairs much shorter, sparser, and lighter 
in color. A nearly full-grown larva is represented in Fig. 1 g, and in this the yellow 
color occupies a wide dorsal stripe and a lateral stripe each side. The head (except- 
ing the mouth parts and anterior margin of the front), the legs (excepting a ring 
around the trochanters), and the posterior portion of the anal segment are always 
black. The first thoracic segment has two large black spots on the disk, of varying 
extent, and often confluent. The following segments (excepting the anal segment) 
are dorsally divided by a shallow transverse impression into two halves, and the 
black markings on these halves are arranged as follows: Two transverse dorsal 
markings, usually confluent, as shown in our figure; two round and sublateral spots; 
the tips of the lateral tubercles are also black. The abdominal joints of the ventral 
surface have each a transverse medial mark, and two round sublateral spots of black 
color. Stigmata visible as small umbilicate spots between outer sublateral series of 
dorsal markings and lateral tubercles. The yellow parts of the upper side are 
opaque, but those of the underside shining. The black markings are polished, 
piliferous, and raised above the remaining portions of the body. 
The larvee are destructive to the foliage from the month of May until 
August. They have about two weeks of active life between the egg 
and pupa states. During this time they prey upon the leaves, which 
become skeletonized, leaving the venation and commonly a certain por- 
tion of the flesh of the leaf, which becomes rust brown. They undergo 
four molts, respectively observed at Washington on July 15 (at hateh- 
ing), 20, 23, and 29 (pupation). When full grown they descend to the 
ground and change to pup under whatever shelter is near to the base 
of the tree. ° 
The pupa is of brighter color than the larva, oval in shape, and 
strongly convex dorsally. It is sparsely covered with moderately long 
but very conspicuous black bristles, irregularly arranged on head and 
thorax, but in a transverse row on each following segment. The pupa 
state lasts from about six to ten days. 
The perfect beetle (Fig. 1 c, natural size; k, magnified) resembles somewhat in ap- 
pearance the well-known striped Cucumber-beetle (Diabrotica vittata), but is at once 
distinguished by the elytra not being striate punctate, but simply rugose, the seulp- 
ture under high magnifying being represented in Fig. 11. The color of the upper side 
is pale yellow or yellowish-brown, with the following parts black: On the head a 
frontal (often wanting) and a vertical spot; three spots on the thorax; on the elytra 
a narrow stripe along the suture, a short, often indistinet scutellar stria each side, 
