64 



THE GRAIN LEAF-HOPPER. 



Diedrocephalus flaviceps Riley. 

 For account of D. mollvpes see Osborn & Ball, Bui. 34, Iowa Agric. 

 Expt. Sta., p. 614, 1897. 

 Exhibit: Adult. 



THE DESTRUCTIVE LEAF-HOPPER. 

 Cicadula exitiosa Ilhl. 

 For general account see Comstock, Rept. U. S. Com in. Agric, 1879, 

 pp. 191-193, 1880. 

 Exhibit: Adult. 



THE WHEAT FALSE WORM. 

 Dolerus arvensis Say. 

 For general account see Rile} T and Marlatt, Insect Life, v. IV, pp. 

 171-172, 1891. 



Exhibit: Adult and figure. 



THE GRASS SAWFLY. 



Pachynematus extensicornis Nort. 

 (Formerly Nemafrus marylandicus.) 



For article under JY. marylandicus see Riley and Marlatt, Insect 

 Life, v. IV, pp. 174-177, 1891. 

 Exhibit: Adult and figure. 



THE WESTERN GRAIN SAWFLY. 



Cephas occidentalis Marl. 

 For short article see Riley and Howard, Insect Life, v. II, p. 286, 

 1890. 



Exhibit: Adult, work and figure. 



JOINT-WORMS. 



For special articles to four following- species see Howard, Tech. 

 Ser. 2, Div. Ent., U. S. Dept. Agric, 24 pp., 1896; also Webster, 

 Bui. 42, Div. Ent., U. S. Dept. Agric, 62 pp., 1903. 



GREATER WHEAT-STRAW WORM. 

 Isosoma grande Eiley. 

 Exhibit: Adult and figure. 



BARLEY-STRAW WORM. 



Isosoma hordei Harr. 

 Exhibit: Adult, work and figure. 



THE WHEAT JOINT-WORM. 



Isosoma tritici Eiley. 

 Exhibit: Adult, work and figure. 



THE HAIRY-FACED JOINT-WORM. 

 Isosoma hirtifrons How. 

 Exhibit: Adult and figure. 



