Vol. 21 No. 1-8 (1941)
Article 1 - The Effects of Petroleum-oil Sprays on Insects and Plants. M. D. Farrar
Article 2 - Responses of the Large-mouth Black Bass to Colors. Frank A. Brown, Jr.
Article 3 - Studies of Nearctic Aquatic Insects:
I. Nearctic Alder Flies of the Genus Sialis (Megaloptera, Sialidae). Herbert H. Ross
II. Descriptions of Plecoptera with Special Reference to the Illinois Species. T. H. Frison
Article 4 - Descriptions of Nearctic Caddisflies with Special Reference to the Illinois Species. T. H. Frison
Article 5 - Preliminary Studies on Parasites of Upland Game Birds and Fur-bearing Mammals of Illinois.
Article 6 - Preliminary Investigation of Oak Diseases in Illinois. W. Henry Lee
Aritlce 7 - A Needle Blight of Austrian pine. Robert L. Hulbary
Article 8 - Duck Food Plants of the Illinois River Valley. Frank C. Belrose, Jr.