IXSECTS AFFECTING PARK AND WOODLAXD TREES 303 



Description. The adult insect is a rather slender, four \vin<j^ed wasplike 

 creatiu'e with a wing spread of nearly i inch and a body length of a little 

 mare than yi inch. It is black, e.xceptir.g the broad orange Ixind at the 

 base of the abdomen. The larva or borer is about ^8 inch long whc;n full 

 grown, legless, white, and with the thoracic segments slightly thickened. 



Life history. The adult is abroad in earl\' spring, and after deposi:- 

 ing her eggs in a shoot, the female i)roceeds to girdle the stem below 

 the point of oviposition, in order to prevent its further growth and thus 

 protect the eggs from being crushed. The larvae gradually work their 

 way downward through the pith a distance of two feet or more, and l)v 

 the beginning of November have completed their growth and Idled the 

 lower ends of their burrows with frass or castings. They then gnaw a 

 passage to the bark through one side of the shoot a little above where the 

 pupal cell is to be formed. W ithin the latter the)' construct a delicate, 

 transparent, c}lindric cocoon in which they winter. The transformation to 

 the adult occurs the following sijring. 



Remedial measures. The wilting shoots art- an early sign of injury, 

 and where the expense is not too great, the insect can be easily controlled 

 by cuttmg them off below the injured point and allow them to drop to the 

 ground. This procediu'e presents the further dexelojjment of the insect 

 and affords parasites, if jaresent, an opportunity to escape. 



Bibliography 

 1904 Chittenden, F. H. U. S. Drji't .\-ri( . ISur. I''nr. IJul. 46, p. 68-70 



Black walnut caterpillar 

 Dataiia iii/rQiri-nua Orott- & Robinson 

 Reddish, white striped or l)la<kisli. wliile haired caterinllars, from Y^ to i^ inches 

 in leni^th, feed in larife clusters in niidsunimer on black walnut, l)ntterniit and other 

 trees. 



This s])eci(s is the more common one of the genus found in New ^'ol■k 

 State on black walnuts and hickories. It has been brought to the writer"s 

 attention a number of times during recent vears, and in 1 002 he observed 



