32 
THE SUGAR-CANE BORERS OF JAVA.' 
By l)r. L. Zi:iiMM:i:. 
DIATU^KA STBIATALIS, SNELLEN. 
The female of Diatnvd strUitnlis lays about 7."> eg^s, always ten to 
twenty to<^etlu'r and arian^^ed in two rows (in the form of a zi<?zag), so 
that tlu' t'jijrs partly t-over each other. The e^<j;s arc stron«,dy tiattened, 
lia\(' an elliptical form, and, as a rule, are fonnd on the u[)per side of 
the leaves. Freshly laid they are ji^reenish white or j^^ray; afterwards 
they become oran«^e or red. Len«^th of an e.ii<4 1-^ to 1.8""", breadth 
O.S.") to i.r 
The y(mng eaterpillars are li to li.25""" Ion "jr. They go between the 
yonnji' leaves, which are not yet unfolded. There they eat oft" the tissue 
of the leaves in spots, so that the epidermis of one side only remains. 
The presence of the caterpillars is indicated by their excrement as well 
Fui.9.—I>iatr(^a striatalit: egfr masses in /dtic ou cano, at left— uaturnl size: larva, at right — enlarged 
(after Zelintiu-r). 
as by the damaged leaves. After having changed their skins four times, 
the larva' penetrate the stalk at dift'erent places, and commence to 
tunnel in an irregular manner. One often linds as many as ten larva' 
in one stalk. J)uring the burrowing in the stalk the larva changes the 
skin once more and thereafter transforms to the pnpa, which lies as a 
rule near the surface of the stalk or between the stalk and the sheaths 
of old leaves. 
The whole development is accomplished within the toUowing periods: 
Development of the agg, 8 daysj development of the larva, 37 to 40 
'This article is a brief rtsuinr of the results of some of the important ami inter- 
esting studies which Dr. Zehiitner has been making at the experiment station at 
Pasorroean, .lava, during the jiast few years. The results of his work are pub- 
lished in the numliers of the " Mededeelingeu van het Pjoelstatiou *Oost .lava, 
from which publication the accompanying illnstrati<»ns have been copied. 
English abstract he projiared at our re<iuest. — L. O. II. 
Ihe 
