236 OHIO EXPERIMENT STATION: BULLETIN 332 



After a scourge of the insect has passed, the resultant injuiy 

 may be minimized to a certain degree if all trees found to be in a 

 dead or dying condition are utilized promptly. The trees will thus 

 be saved from the horde of insect depredators which feed upon such 

 timber and from the ravages of wood-rotting fungi. 



TWO OTHER LEAF MINERS OF THE GENUS CHALEPUS 

 (Chalepus nervosa Panz) 

 {Chalepus rubra Weber) 



Quite frequently one finds associated with the locust-leaf miner, 

 the beetles of two other species of the same genus. In general 

 appearance the adults closely resemble those of the better known 

 C, dor sails; both, however, are a little smaller and the general color 

 is paler red. Neither possesses the centrally located black area of 

 the wing covers so pronounced on C. dorsalis. Rarely does either 

 C. nervosa or C. rubra occur in plentiful numbers, though occasion- 

 ally the first named is fairly abundant. Such an occasion was 

 noted by the writer in 1912 when the insect was observed near 

 Marietta. In this instance dogwood was the favorite host, though 

 locust and apple also were well infested. Only the adults were 

 observed. Basswood is reported as the favorite food plant of the 

 latter; indeed, it is sometimes called the leaf -mining, linden beetle. 

 From the leaves of this tree the mining larvae have been reared. 

 The beetle is also reported as having been reared from the leaves 

 of apple. 



Both species are rather widely distributed and both in all like- 

 lihood can be controlled by spraying the attacked plants with arsen- 

 ate of lead. 



MAY BEETLES, OR JUNE BUGS 



(Lachnostcrna sp.) 



Under some conditions and during some seasons, May beetles, 

 or June bugs, do considerable harm particularly to isolated trees or 

 small groves. 



Description. — There are a considerable number of species be- 

 longing to this genus (Lachnosterna) and they vary considerably 

 in size and appearance. In a general way the adults are heavy- 

 bodied, brown beetles either light or dark in shade. Usually they 

 are about three-eighths to five-eighths of an inch in length, and 

 though heavy and awkward, they fly readily. (See Plate XXXIII, 

 Fig. 1.) The eggs are small white ovals deposited beneath the 

 surface of the soil from one to several inches. The larvae scarcely 

 need description since they are the common white grubs so well 



