190 
IOWA ACADEMY OP SCIENCES. 
The adult female is about 7.50 mm. long by 2 mm. broad, with 
a par abolicaily curved, thin edged vertex and a stout abdomen, 
attenuating posteriorly and extending beyond the rounding 
elytra. The males are smaller and have the vertex shorter 
and more obtusely pointed. The abdomen is smaller and does 
not extend beyond the narrow and nearly parallel margined 
elytra. 
They are both of a uniformly deep green color above, some- 
what lighter below, with a narrow band under the sharp ver- 
tex, and the eyes dark; the exserted tip of the ovipositor, orange 
red. 
The first brood of the adults appeared the first week in May 
and remained until the middle of June, disappearing gradually. 
They feed principally upon the leaves usually about the middle, 
feeding on either side and either end up, with equal ease. 
The eggs are deposited during the last of May and the first 
week in June. The females usually selecting a position just 
above the first leaf base and invariably placing themselves 
head downward, exsert the ovipositor and insert it under the 
flap of the sheath, gradually working backwards up the stalk 
for a distance of two inches or more and depositing from seventy 
to one hundred and twenty eggs within an hour. 
The eggs are 1 25 mm. long by .25 mm. broad, cylindrical, of 
nearly uniform size and obtusely pointed at both ends, arranged 
in a single series, side by side, curving considerably around the 
small stem. 
The larvae appeared the last week in June, giving an incuba- 
tion period of fifteen to twenty days. Upon bursting the egg 
case the larvm crawl part way out from under the sheath and 
remain quiescent in this position for an hour or two when, 
becoming suddenly active, a flock of very small larvae may be 
seen ascending the stalk and distributing themselves upon the 
leaves, while a row of freshly shed skins with the abdomens 
still remaining under the sheath, their tips scarcely free from 
the egg shells, explains the cause of the delay. 
When first hatched the larvae have a characteristic head, 
depressed, light colored, soon deepening, however, and in some 
assumes more or less definite stripes of darker which, in the 
most extreme forms coalesce, and a black specimen is the result. 
In normally colored specimens there is on either side of a median 
light line a narrow black stripe originating in a spot on the 
anterior margin of the vertex, obscured across the disk and 
