(_b_) The difference in the number of hooks in the right and left wing is compensated for in a given hive by the increased size of the wing. The right and left wings are in physiological equilibrium. (_c_) In different hives the increase in the number of hooks is accompanied by an increase in width of wing; that is, the variation is emphasized so that selection would work much more effectively; while in the individual, where—if selection operated on account of this variation—it would have to be between different wings of the same bee, the variation is eliminated. TWELVE PLANTS ADDITIONAL TO THE OHIO LIST. W. A. KELLERMAN. The species named below have not heretofore been recorded as a part of the Ohio flora. The first collector and locality are given for each of the listed species. The serial number prefixed to each name indicates where in the Fourth State Catalogue the species should be inserted. 123a Sorghum vulgare Pers. Occasionally escaped. 270b Secale cereale L. Rye. Occasionally escaped. 781b Dianthus barbatus L. Sweet William. Escaped. Painesville. Otto Hacker. (1042a Crataegus polybracteata Ashe. Reported previously, but without locality. Franklin, Hocking, and Summit Counties; W. A. Kellerman.) 1042b Crataegus pruinosa Wendl. Logan County; W. A. Kellerman. 1042c Crataegus succulenta. Franklin, Fairfield, Knox, Belmont, Summit, Ottawa, Union, Ross, Carroll, Shelby and Lucas Counties; W. A. Kellerman. 1526b Teucrium occidentale Gr. Hairy Germander. “Ohio”, Riddell, 1834, (Bull. Torr. Club, 28:170); Reservoir Park, Perry Co., W. A. Kellerman. 1529a Scutellaria serrata Andr. Showy skullcap. Rio Grande. Gallia County; Ruth E. Brockett. 1605a Solanum tuberosum L. Potato. Escaped. 1609c Petunia violacea Lindl. Occasionally escaped. 1709a Viburnum molle Mx. Soft-leaf Arrow-wood. Scioto County; W. A. Kellerman. 1714a Linnaea borealis L. Twin-flower. Canton, Stark County; Mrs. Theano W. Case. 1986a Chrysanthemum indicum Hortorum. Escaped. Adams County; W. A. Kellerman. THE FOOD HABITS OF SOME APHROPHORA LARVAE. E. D. BALL.