1892.] NATURAL SCIENCES OF PHILADELPHIA. 11 THE SPIDER FAUNA OF THE UPPER CAYUGA LAKE BASIN. BY NATHAN BANKS. In the list given below are contained all the species of spiders known to occur in or near Ithaca. The region examined has no exact limits. It may best be defined as the Upper Cayuga Lake Basin. It embraces the country drained by the streams which flow into the head of the Cayuga Lake. The shores of the Lake have been ex-amined only for a short distance: on the west side for ten miles to Traghanic ; on the east about four miles to Burdick's Glen. A large share of the collecting has been done in the beds of the gorges and in the swamps. Of these, those most carefully examined are as follows: of the gorges, Fall, Cascadilla, Six Mile and Buttermilk Creek ; of the swamps, Inlet Marsh, Beebe Island and South Hill ]\Iardh. Collecting in the other localities has not been so thorough. The collecting began in the spring of 1888 and has lasted about two years. From these facts it may be seen that the list is not at all complete. The collecting has been done chiefly by myself although others have occasionally given me specimens. To them I am deeply indebted, both for the specimens and for the encouragement they have shown me. Those who have especially aided-me are Mr. G. Van Ingen, Mr. H. Hicks, Mr. A. D. MacGillivray, Mr. H. W. Norris and Mr. Brace. To Prof. L. M. Underwood, of Syracuse University, I am under the deepest of obligations. Were it not that he kindly lent me much literature on the subject, this paper could not have been written. To the Rev. Dr. H. C. McCook, of Philadelphia, I wish to express my thanks for the work done upon the Epeiridre. To J. H. Eraerton I am deeply indebted for much help in determining several species, and to Prof. J. H. Corastock, under whose direction the paper has been written, for much kindly assistance and en-couragement. The country is very diversified, low lands and high hills, marshes, creeks forming beautiful gorges, bare rocky cliflfe and mud-bottoms. The climate is as varied as the country. These facts, with its flora and insect fauna, account for the large number of spiders. Diversity of country is of course more favorable to ground spiders than to web-building ones ; so it will be noticed that the pro-
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