EXPERIMENT STATION BULLETINS. 



135 



12. THE BASSWOOD LEAF-MINER. 



{Ldthocolletis lucetiella, Clem.)t 



\'ei y many of our lindens or basswood trees were attacked by a leaf-miner, L. luce- 

 tiella, Clem., and though no damage resulted other than the injury to the appearance 

 of the tree, their work was very conspicuous. Fig. 12 represents an adult moth of this 

 species. The moths emerged on July 29. 



Two more species were observed in quantity; one on the common locust (Robinia 

 pseudacacia) and the other on a smaller variety used for ornamental purposes (R. 

 hispida) . The name of the insect is GraciUaria robiniella, Cham.* The leaf-miner in 

 the common locust makes a blister mine more regular in shape. Its name is Lithocol- 

 letis robiniella, Clem. 



Fig. 13 represents Deprrftsariii nri/iUacea, Wlsm.* found on linden. 



Fig. 1.3. Dfi-pressaria argiUacen AVlsin. (Original.) 



13. LEAF-MINER IN SUGAR BEET. 



(Pegomyia vicina Lint.) 



It was planned, during tlie season of 1898, to study the insects affecting sugar beets. 

 Fields were examined wherever opportunity offered, but all the accessible ones proved 

 to be remarkably free from insect attack ; some of the leaves, however, were observed 

 to be infested with a leaf-miner, wliich produced a blister-like mine on the upper surface 

 of the leaf by eating out the succulent material between the upper epidermis and the 

 lower. Specimens of such niiiiod leaves were placed in a cage on June 28, and on 



+ A hymenopterous i>arasitP, '^ Vc<.s/(/v)s/rci/.s trif'mrtii.t .\sliiii., was l)re(l from tliis miner. It was 

 •letermined l>v Mr. ^Vlll. A8limea<l <>f tlit- Dcpt. <>f Aj^r. at Wasliington. I). ('.. thniugli the kiiKlness of 

 Dr. r.. (). Howard. 



* Tlie.-*e two insects were determincii h\ .Miss .Miirtfeldt of Kirliwond, .Mo. 



