34 
etation point.| As a result the stalk grows. no further, the youngest 
internodes remain short, and, in consequence, their leaves stand close 
together, forming a sort of fan. Moreover, four to six eyes of the stalk 
erow out. Often these young iateral shoots all die, as well as the old 
stalk. 
The eggs are very often infested by Ceraphron beneficiens Zelut. 
CHILO INFUSCATELLUS, SNELL. 
As arule this borer lays its eggs in clusters on the under surface and 
near the base of the leaves, although sometimes they are laid on the 
upper side and then almost always just on the midrib. They resemble 
very much those of Diatrea striatalis, but are a little smaller and ordi- 
narily arranged in three to five rows. Often one finds 
50 to 75 together, and the total number produced by one 
female is from 200 to 240. 
The larve hatch after eight days and are about 2™™ 
long. They, as well as the full-grown larve, are light yel- 
low and have five reddish longitudinal stripes on the back. 
(In Diatrea striatalis the freshly hatched larve have, 
besides other differences, a transverse stripe on each ab- 
dominal segment and the full-grown larva has but four 
longitudinal stripes, the median one of Chilo being absent. 
The young larvie penetrate in aid between the sheaths 
of the leaves of young shoots. There they rest until they 
have molted four times and then penetrate transversely 
and a little above the vegetation point. Upon reaching 
the center the tunnel is directed in a straight line down- 
ward. Here the heart of the shoot is eaten out, and finally 
Fie.1.—Chiloin the stalk is attacked and its vegetation point destroyed, 
oar ied so that the growth of the shoot becomes impossible. In 
enlarged (after one Shoot one finds often three to five borers. 
elaiaer) When the larva is full grown it makes a horizontal 
gallery above the vegetation point, 7. e. through the sheaths of the 
leaves. The dust is then removed—partly downward, partly upward. 
Thereupon the larva pupates and the pupa lies anywhere in the ver- 
tical gallery in which it is able to move itself. 
The whole development is accomplished within the following periods: 
Egg state, 7 to 8 days; larval state, 38 to 42 days; pupal state, 7 to 3_ 
days; total, 52 to 58 days. 
GRAPHOLITHA SCHISTACEANA, SNELL. 
This insect lays its eggs in a single or double row on the leaves and 
on the sheaths of young shoots. They also much resemble those of 
Diatrea striatalis, but are considerably smaller and very difficult to 
1In German: Vegetationspunkt, Vegetationsspitze. 
