158 PROCEEDINGS OF THE ACADEMY OF [May, REVISION OF NORTH AMERICAN SPIDERS OF THE FAMILY LYCOSIDJE. by ralph v, chamberlin. Table of Contents. PAGE Introduction 158 Lists of described North .Ajmerican Lycosidae 163 The Family Lycosidse 165 Key to Genera 169 The Genus Pardosa: Definition 170 Key to species 172 Description of species 174 The Genus Schizocosa; Definition...^ 210 Key to species 212 Description of species 212 Tlie Genus Lycosa : Definition 220 Key to species 223 Description of species 226 The Genus Allocosa: Definition 284 Key to s5)ecies 285 Description of species 285 The Genus Sosippus : Definition 292 Description of species 293 The Genus Trabea : Definition 295 Description of species 296 The Genus Sosilaus : Definition 298 Description of species 298 The Genus Pirata: Definition 299 Key to species 301 Description of species 301 Explanation of Phates '. 316 Introduction. The Lycosidce form one of the most successful of all families of spiders. Their common names of wolf and running spiders indicate their dominant traits. All live close to the earth, roaming freely and boldly, and with rare exceptions capturing their prey by the chase rather than by means of webs or other strategy. They are among the most familiar and widely distributed of spiders. The Piratas and
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