LAMELLICORN-BEETLES. 



81 



to the method of cultivation in use. They drop readily when the 

 vines are jarred, and the collector should be so made as to roll 

 them into the center and into an attached pail containing kero- 

 sene. This must he done not only daily, but continuously for 

 several days until the flight is over or the grapes have set, for 

 well-set grapes are rarely eaten. Fortunately, a period of ab- 

 normal increase seems to be followed by a period of decrease, 

 though the length of the periods have not been ascertained. The 



Fig. 89. — Macrodactylus subspinosus, Fab.— After Division of Entomology, 

 U. S. Department of Agriculture. 



larvae feed in light land on the roots of various plants, but prin- 

 cipally on grass. They pupate in spring, shortly before they 

 change to the adult condition, and by ploughing infested sod 

 at this time a large proportion can be destroyed. When only 

 moderate numbers occur, lime often serves to protect the plants, 

 or, better, the Bordeaux mixture, which is distasteful to them." 

 As may be seen bv the illustration this ochreous vellow 



