INSECTS AFFF.CTING PARK AXD WOODLAND TREES 12/ 



defoliation during the growing season. This is specially true of arbor vitae 

 and red cedar. It has been recorded on the following trees, beside those 

 previously mentioned : apple, pear, plum, cherr\-, chokecherry, apricot, quince, 

 linden, catalpa, maple, locust, oak, elm, poplar, sycamore, osage orange, 

 willow, spruce, hemlock, larcli and white pine. 



Distribution in the United States. This species is stated Ijy Dr Riley 

 to occur in the m<jre southern portions of the middle states and in the 

 southern states, though it appears to be absent from the peninsula of Florida. 

 It occurs within these limits from the Atlantic to Texas and reaches the less 

 timbered regions west of the Mississippi. Professor Webster has recently 

 shown that this insect has established itself in Ohio within 25 miles of Lake 

 Erie. 



1 p 1 a inquisitor: «~full grown summer larva ; i^-hiber 

 nating larva; t-mouth pans of larva; rf-adult female; ,-=abdomcu of 

 male from side — all enlarged ; c=greatly enlarged. (After Howard. U.S. 

 Dep't Agric. Div. Ent. Tech. Ser. 5. i.Sq?) 



Natural enemies. This species is subject to attack by several natural 

 enemies. Pimp la incjuisitor .Say, P. conquisitor Say, and 

 H e m i t e 1 e s t h y r i d o p t e r i g i s Riley, are among the more important 

 ichneumon parasites. The last named is more abundant than the two 

 preceding, and unfortunately, it is probably a hyperparasite preying on 

 the beneficial Pimplas. Chalcis ovata Say is a minute, four winged 

 fly which was reared from this species by Dr Lintner. Dil^rachys 



