10 



Fig. 4. Cross section of small black locust tree showing injury caused by larvae 

 of the Locust Borer (Cyllene robiniae). (Original.) 



Harris describes this insect as follows : , 



"The adult insect has a velvet-brovrti body, ornamented with transverse yel- 

 low bands, of which there are fhree on the head, four on the thorax, and six on 

 the-wittgcovers, the tips of which are also edged with yellow. The first and second 

 bands on each wingcover are nearly straight; the third forms a V, or, united 

 with the other, a W; the fourth is also angled and runs upward on the inner 

 margin of the wingcover toward the scutel ; the fifth is broken or interrupted by 

 a longitudinal elevated line ; the sixth is arched and consists of three little spots. 

 The antennae are dark brown, and the legs are rust red. The insect varies from 

 six-tenths to -three-fourths of an inch in length." 



Fig. 5. Adults of the Locust Borer (Cyllene robiniae) : ■ 



Natural size. (Orr.srcsj.i 



■ a, male ; b. femalo 



