26 College of Forestry 
Fish,” and to him the thanks of the author are due. Many 
people have contributed to the suecess of the work, either by 
reporting upon critical material or by making suggestions of 
value during the progress of the investigation. To these, 
whose names appear in the appended list, the writer desires 
to express his deep appreciation. 
Mrs. Frank C. Baker, Syracuse, N. Y., assistance in col- 
lecting material. 
Dr. Cornelius Betten, N. Y. State Agricultural College, 
Cornell University, Ithaca, N. Y., T’richoptera. 
Dr. M. W. Blackman, N. Y. State College of Forestry, 
Syracuse Uniy. 
Dr. Wm. L. Bray, Syracuse University, Plants. 
Dr. Harry P. Brown, N. Y. State College of Forestry, 
Syracuse University, Plants. 
Mr. Frank S. Collins, North Eastharm, Mass., Algae. 
Dr. E. P. Felt, State Entomologist, Albany, N. Y., Pub- 
lications. 
Mr. Wm. J. Gerhard, Field Museum of Natural History, 
Chicago, Ill., Coleoptera and /Temuptera. 
Mr. John R. Malloch, Hlinois State Laboratory of Nat- 
ral History, Urbana, Il, Chironomide. 
Dr. C. Dwight Marsh, Bureau of Plant Industry, Wash- 
ington, D. C., Copepods. 
Dr. J. Perey Moore, University of Pennsylvania, Phila., 
Pa., Leeches. 
Dr. James G. Needham, Cornell University, Ithaca, N. Y., 
Odonata. 
Dr. A. EK. Ortmann, Carnegie Museum, Pittsburgh, Pa., 
Crawfishes. 
Or SEAS Pilsbry, Academy of Natural Sciences, Phila- 
delphia, Pa, Amnic olide. 
Dr WW. ae Sterki, New Phila: deinen Ohio, Spherude. 
U.S. Bureau of Fisheries, Biological Laboratory, Fairport. 
Towa (through the director, Dr. Austin Shira), a erowfoot 
dredge. 
Dr. Bryant Walker, Detroit, Michigan, Ancylidw, Amn- 
colide, ete. 
Miss Ada L. Weckel, Oak Park, Illinois, Amphipods. 
