THE CATALPA MIDGE. 



13 



way,'a straight skyward growth is forced and, although the young 

 ti-ees start off with crooked trunks due to successive forkings, 

 caused W"^ terminal injury, after a few Tears the trunks will have 

 become qV^te straight. After the tree?, have attained an age of five 

 or six y^ars alternate trees can be but out, if necessary, and the 

 trees may^ be trusted' after this age t6 grow fairly straight. 



ACKNOVy-ED GEMENTS. 



"fl'i"> Mess- 



m 



I am ' 

 ford for ■ 

 submitt' 

 Messr 

 ous fiel 

 Cooperati^ 

 data from 

 Houser f( 

 express vr 



"^o^ard. Felt, Coquillett and Craw- 



"bn various specimens of insects 



]gress of the investigation; to 



(in and H. T. Osbom for numer- 



jry records; to the Department of 



Station for assistance in collecting 



.atalpa; and to Messrs. Goodwin and 



given. To all of the foregoing, I 



