534 PROCEEDINGS OF THE ACADEMY OF [AugUSt, 



DESCRIPTIONS OF LYCOSID^ AND OXYOPIDiE OF PHILADELPHIA 

 AND ITS VICINITY. 



BY THOMAS H. MONTGOMERY, JR.^ 



The present paper is based on a study of the following collections : 

 that in the Academy of Natural Sciences of Philadelphia, a rich 

 collection made by Mr. Witmer Stone, which was the basis of the 

 first contribution on Pennsylvania Lycosidce, Mr, Stone's " Penn- 

 sylvania and New Jersey Spiders of the Family Lycosidse, ' ' a small 

 collection made by the Eev. Dr. H. C. McCook; and the author's 

 own collection, specimens mainly from West Chester, Pa., from 

 Philadelphia and its close vicinity. I would express my indebted- 

 ness to the Academy of Natural Sciences, and to my friend Mr. 

 Stone in particular, for the use of its collections. The greater 

 number of the specimens examined are from Philadelpliia and 

 from Chester county. Pa., others from various parts of Pennsyl- 

 vania, from New Jersey, New York State and one from Maryland. 

 The present contribution probably does not include all the species 

 around Philadelphia, and much less all of Pennsylvania and New 

 Jersey. 



The figures represent the copulatory organs, drawn with great care 

 in regard to the details, for these organs are undoubtedly of first 

 diagnostic importance. The epigyna are frequently difficult to see 

 clearly in all their parts; it is always necessary to denude them of 

 the hairs to make them more discernible, and in some cases to 

 dissect them away from the body and study them by transmitted 

 light. The other characters of importance are the arrangement of 

 the eyes (including the relative extent of the dorsal eye area), the 

 relative proportions of the dimensions of the cephalothorax and its 

 form, the relative length of the legs, and the relative length of 

 the superior and inferior spinnerets. Form and dimensions of the 

 abdomen are of little value. Color is quite constant in some spe- 

 cies, but highly variable in others, and sometimes there is quite a 



^ Contributions from the Zoological Laboratory of the University of 

 Pennsylvania. 



