348 REPORT OF NEW JERSEY STATE MUSEUM. 



G. luteola Mull. The elm-leaf beetle; common throughout the State, and 

 usually more or less injurious to city shade trees. There is only a 

 single brood in most of the State, and thorough spraying with 

 arsenate of lead, 1 Ib. in 20 gallons of water, will prevent injury. One 

 spraying should be made when the beetles first begin to feed, the 

 second when the eggs begin to hatch, and the effort should then be 

 to hit the underside of the leaves. 



MONOXIA Lee. 



M. puncticollis Say. On salt meadows, from the Passaic to Cape May 

 VI, VII: usually not rare; strictly maritime. 



DIABROTICA Chev. 



Fig. 140. Spotted cucumber beetle, Diabrotica iz-punctata: a, egg; b, larva; 

 c, holes drilled in corn stalks; d, pupa; e, adult: all enlarged. 



D. 12-punctata Oliv. Common throughout the State IV-X on a great 

 variety of plants and sometimes injuring cucurbs; larva in roots of 

 corn and grasses. 



D. vittata Fab. The "striped cucumber beetle"; throughout the State; 

 common and often seriously injurious to cucurbs. The beetle eats 

 into the stem at the surface, the larva mines in it a little under- 

 ground. Most of the injury is done by the beetles, which attack the 

 plants soon after they are up, and a great variety of methods are 

 employed to prevent it. Sometimes carbolized lime or lime and tur- 

 pentine are applied in the hill, or a dead fish, or freshly ground bone, 



