SOME MISCELLANEOUS IIESIILTS OF THE WOlUv OF 
DIA ISION OF EN rOMOLOGY. 
THE PEACH TWIG-BORER.' 
{Avarsia lineateUa Zell.) 
V.y C. L. Maulatt. 
INTRODUCTION. 
Up to tlie present year the twig-borer of stoiie fruits and the crown- 
miner of the strawberry have been treated as the same insect, as 
indicated in the appended bibliography and as will be fnlly explained 
later. 
Prior to the observations made by Mr. E. M. Ebrhorn, as published 
by Mr. Alex. Craw, the knowledge of the twig-borer was confined to 
the fact of its injury to peach twigs, either in terminals before the 
trees leaved out in the spring, as described by Glover; or in the young 
shoots and later in the ripening fruit, as described by Professor Com- 
stock and others. What was supposed to be the same insect had also 
been observed to affect the crown of the strawberry, as reported by 
Mr. William Saunders and later by other writers, one brood wintering 
in the half-grown larval stage in the crowns and a second brood work- 
ing during early summer in the young shoots and runners. 
While passing through California in the fall of 1896 the writer had 
the pleasure of meeting Mr. Ehrhorn and examining with him the curi- 
ous hibernating chambers made by the newly hatched larviii of this 
insect in the crotches of the trees and had explained the habits of this 
insect as far as then known to Mr. Ehrhorn and substantially as recorded 
by Mr. Craw. The discovery of this peculiar hibernating habit of 
Anarsia linealella is very interesting in itself, and is also a long step 
toward the completion of our knowledge of the lifehistory of the insect, 
and is especially valuable as suggesting better means tlian any hereto- 
fore known of preventing damage from it. 
Arrangements were made Avith Mr. Ehrhorn at the time to supply the 
Department with ample material of the j^oung larva^ in their hiber- 
nating cells; and, throughout the winter and spring of 189G-97, Mr. 
Ehrhorn was good enough to send repeatedly quantities of such material 
' Read by title before the uhitb annual meeting of the Association of Economic 
Entomologists, August 13, 1897. 
