ATTACKING THE ROOTS. 229 



male overlap one another like tiles on a roof. It is very 

 similar in appearance to the broad-necked prionus, but the 

 two species may be distinguished by the difference in the 



FIG. 235. 



number of the joints in their antenna : in imbrieornis the 

 male has about nineteen joints, and the female about sixteen, 

 while in laticottis both sexes have twelve-jointed antennae. 

 Any remedial measures useful for one species will be equally 

 applicable to the other. 



No. 124. The Grape-vine Root-borer. 



jEge>*ia polistiformis Harris. 



This larva resembles that of the peach-tree borer, No. 97, 

 in appearance and habits, but is a little larger in size. The 

 larvaB of the Prionus beetles have only six legs, while this 

 Egerian larva, in common with most lepidopterous insects, 

 has sixteen legs, six horny ones 

 on the anterior segments, and ten FlG - 



fleshy or membranous ones on the 

 hinder segments, and when full 

 grown it measures from an inch to 

 an inch and a half in length. (See Fig. 236.) It lives ex- 

 clusively under ground, and consumes the bark and sap-wood 

 of the grape-roots, eating irregular furrows into their sub- 



