1892. The Yucca Moth and Yucca Pollination. Third Ann. Rep. Mo. Bot. Garden, pp. 99-158.
Robertson, C.
1897. Flowers and Insects. Contributions to an Account of the Ecological Relations of the Entomophilous Flora and the Anthophilous Insect Fauna of the Neighborhood of Carlinville, Illinois. Trans. Acad. Sci. St. Louis, Vol. VII, pp. 151-179.
This is only one of a very extensive series of papers published in the Transactions of the St. Louis Academy, Vols. V, VI, VII, and in the Botanical Gazette—beginning with Vol. XIV, 1889, and extending to Vol. XXVIII, 1899.
Trelease, W.
1893. Further Studies of Yuccas and their Pollination. Fourth Annual Rep. Mo. Bot. Garden, pp. 181-226.
Beutenmüller, W.
1904. The Insect-Galls of the Vicinity of N. Y. City. Am. Mus. Jour., Vol. IV, pp. 89-124.
A descriptive illustrated catalogue. Beutenmüller has published several important papers on galls in the Bull. Amer. Mus. Nat. History.
Adler, H. (Trans. by C. R. Straton.)