228 



INSECTS INJURIOUS TO THE GRAPE. 



are thickly punctated. In the male the body is shorter, 

 while the antennae are longer, stouter, and toothed. 



Little or nothing can be done in the way of extirpating 

 these under-ground borers, as their presence is seldom suspected 



FIG. 233. 



FIG. 234. 



until the vine becomes sickly, or dies from the injuries they 

 have caused. Where grape-vines die suddenly from any 

 unknown cause, the roots should be carefully examined, and 

 if evidences of the presence of this borer are discovered, it 

 should be searched for and destroyed. 



No. 123. The Tile-horned Prionus. 



Prionus imbricornis (Linn.). 



The larva of this beetle, a species closely allied to No. 122, 

 has also been found devouring the roots of the grape-vine. 

 The larvae of these two species resemble each other so closely 

 that they are almost indistinguishable. When full grown, 

 the borer collects together a few fibres and chips of the roots, 

 and with the aid of these constructs a loose cocoon, within 

 which it changes to a pupa almost identical with that of 

 No. 122. (See Fig. 233.) 



This beetle, which is represented in Fig. 235, is called the 

 Tile-horned Prionus because the joints of the antennae of the 



