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Fakorede, M.A.B., and J.J. Mock. Relationships between grain yield and agronomic traits in five maize variety hybrids. 355

Patanakamjorn, S., W.D. Guthrie, and W.R. Young. Meridic diets for rearing the tropical corn borer, Ostrinia furnacalis. 361

Patanakamjorn, S., W.D. Guthrie, and W.R. Young. Biology of the tropical corn borer, Ostrinia furnacalis, in relation to host plant resistance research. 371

Maini, S., and J.A. Klun. Portable cold table for immobilizing and handling insects. 387

Lewis, L.C., and E.S. Raun. Laboratory and field evaluation of the DD-136 strain of Neoaplectana carpocapse. for control of the European corn borer, Ostrinia nubilalis. 391

Williams, D.D. Biacetabulum oregoni sp. n. (Cestoda: Caryophyalleidae) from Catostomus macrocheilus. 397

Williams, D.D. A key to caryophyllidean cestodes of Iowa fishes. 401

Best, L.B., K.L. Varland, and R.B. Dahlgren. Effects of stream channelization on land-use practices in Iowa. 411

Carlander, K.D. History of the fish population of Lake LaVerne, Iowa State University campus. 425

Galejs, I. Locus of control and social interaction of preschool children. 435

Breiter, J. A consensual validation of elementary social studies objectives, techniques, and materials. 443

Boles, D.E., and G.L. Rupnow. The impact of corporate farming and rural land ownership upon local communities: a bibliographic review. 473