20 
probably complete or nearly so by September 1. The length of time 
passed by one individual insect in the pupa state is not yet known. 
Adult Beetle—As this insect is more likely to be encountered ina - 
mature condition than in any other of its stages, the dates of its 
appearance here given will afford a better idea of the period during 
which the brood develops, than those derived from collections made 
in the other stages. Dr. Boardman says: ‘‘I found the beetle in 
Southern lowa, this year, as early as the 25th of June; but the 
earliest date on which I have found it in the latitude of Stark 
county, is from the 1st to the 10th of July. I think that the 
beetles commence to come out of the ground about the first half of 
July, and continue until the latter part of August.” In another 
letter from Stark county he says: ‘I could not find any beetles 
here on the 28th or 29th of June, when I searched for them, nor 
for some days after that time; but I caught them one year ago on 
the Ist of July.” 
The first specimen obtained at Normal, this year, was collected 
from a roadside plant, on the 27th of July. No search for them 
had been made in the cornfields, however, and the fact that a few 
days later, namely. on the 1st of August, they were found very 
abundant in a field at Arrowsmith, in McLean county, makes it 
seem probable that they might have been collected earlier in this 
situation. ‘These specimens were fresh from the pupa, as shown by 
their very light color. They were more numerous upon the corn, at 
this time, than upon the weeds in the field. On the 7th of August 
they were found abundant-in cornfields at Pekin, chiefly gathered 
at the bases of the leaves where these join the stalk, and apparently 
feeding upon the pollen and anthers of the corn gathered there. 
On the 18th of August, at Elmira, I found them at the bases of 
the leaves, and likewise on the silks of the corn, which they were 
evidently eating freely at this time. The insect was now chiefly in 
the pupa state, only a few larve remaining; while the beetles were 
intermediate in number between the two other stages. On the 21st of 
August, in DeKalb county, larvee, pup and imagos were still found ; 
and in DeKalb and Kendall counties the beetles were seen pairing 
in the field, at various dates, from the 17th to the 25th. On the 
26th, they were first noticed on the blossoms of thistles outside 
the field, but many still occurred in the cornfield, behind the sheaths 
of the corn and upon the silks. Their abundance in the last-named 
situation in the fields near Jacksonville, two days later, has already 
been noted. They were generally scattered through the field, but 
most of them were in the silk at the tip of the ear. On the 4th of 
September, at Normal, a few were still to be found in the tip of 
the ear, feeding partly upon the silk, but also upon the terminal 
kernels of the corn. At this time, however, most of them were 
scattered upon the flowers of ragweed and smartweed in the field. 
On the 11th, they were still noted feeding upon the silk and corn, 
and likewise upon the blossoms of Helianthus outside the fields. 
On the 16th of the same month they occurred, chiefly upon smart- 
weed and ragweed, but a few were yet eating the silks of the greener 
ears; none were to be found about the bases of the stalks, and only 
two or three were seen behind the sheaths. They also occurred upon 
the thistles and golden rod outside the field, Lut had not yet aban- 
