12 PROCEEDINGS OF THE ACADEMY OF [1892. 



portion is greater in the Lycosidje than in the Epeiridse when com- 

 pared with the New England fauna. 



Several bibliographies of American spiders are easily accessible. 

 The American Naturalist for November, 1887, contains a quite 

 complete one by Prof. Underwood. Bulletin No. 19 of the U.S. 

 Department of Agriculture also contains a list of the more important 

 works. Many of the early descriptions are worthless and may never 

 be identified. I have not thought Walckenaer's names worth using. 

 Some of Hentz's species will probably never be determined. Some 

 later writers have occasionally been careless in describing species. 



The list here submitted will compare favorably with others, as 

 may be seen by the following : — 



Cayuga Lake, by Banks, (1890) 363 species 



Great Britian, by Cambridge, (1874) 457 



Sweden, by AVestring, 308 



Italy, 404 " 



France, by Simon, (1874) about, 1000 " 



Austria, by Doleschal, (1867) 205 " 



Prussia, by Ohlert, (1867) 188 " 



Tyrol, (1867) 233 " 



Vicinity of Prague, by Prach, (1866) 119 " 



Spiders of Tren^, by Canestrini, (1875) 243 " 



Catalogue of Spiders of Switzerland, by Pavesi, (1875) 285 " 



Spiders of Westphalia, by Karsch, (1874) 154 " 



South Kussian Spiders, by Thorell, (1875) 303 



Emerton has published lists of the New England forms of seven 

 families ; they compare with the Ithaca ftiuna as follows : — 



New England. Ithaca. 



Lycosidfe, 33 species. 42 species. 



Epeirida?, 51 " 43 



Therididw, 137 " 124 



Ciniflonidre, 16 " 14 



Drassidfe, 34 " 43 



Agalenidse, 11 " 17 



DysderidiB, 2 " 



It will be seen from these comparisons that the vicinity of Ithaca 

 is a very fertile locality for spiders. 



Classification is only possible when many links are lost. 

 Among the spiders as they exist in this locality certain groups are 

 quite definite, while others are closely related. The Lycosidse 

 and Attida3 are distinct both from each other and from the 

 other families. The Thomisidfe ai^e also easily separated. The 

 Epeiridaj and Therididre can be separated, yet Meta is almost as 



