Twelfth Report op the State Entomologist 217 



tinues its course downward, and on the stalks examined could usually 

 be found at the end of a freshly cut channel of about one-half inch in 

 length. In several instances a small opening was visible in the petiole 

 through which the larva had emerged to undergo its transformations 

 within a fold of a shriveling leaf, or possibly among the leaves on the 

 ground. 



Its Habits Compared with Those of Proteoteras aesculana. 



These closely allied insects have ditferent habits that are of value in 

 distinguishing the species. S. Claypoliana bores the leaf-stalk of both 

 the buckeye and maple and very rarely the twigs of the former. It is 

 also known to feed on the blossoms of the buckeye. The larva of 

 P. cesculana bores the slender terminal twigs of both these trees and 

 often forms a swelling or pseudo-gall — the former insect never produces 

 a gall. P. cesculana bores the petioles and terminal twigs for a distance 

 of from one-half an inch to two inches, and lives in the gall, apparently 

 through most of its larval existence. It feeds also on the winged 

 seeds of the maple. .S". ClaypoHafja, on the contrary, seldom or never 

 bores along the leaf-stem more than half an inch, very rarely enters 

 the terminal twigs, and lives in the rolled up leaf after the first two or 

 three days. 



Remedies. 



The mining within the leaf-stalk by this insect has caused many leaves 

 of the buckeye and maple to fall in certain localities, yet it is not proba- 

 ble that it will multiply and spread to such an extent as to become a 

 serious pest, although in one of the maple twigs sent, four of the five 

 leaves that it bore contained larvae within the petioles. 



Should further observations show that many of the fallen leaves carry 

 with them to the ground the infested portion of the petiole or the insect 

 within the folds of the leaf, as they appear to do in some instances, then 

 it would be of service to collect and burn the leaves as soon as they fall, 

 and before the larva has left them. 



