Superfamily Argiopoidea 



The genus Lycosa is a very large one; even as restricted here, 

 by the removal of the genera Pirata, Allocosa, and Scbi^ocosa, 

 all of which are included in it by Simon, it is represented by 

 about thirty known species in the United States and Canada 

 alone. Many of these species are very widely distributed, 

 occurring over the greater part of the continent; and as they 

 exhibit considerable variation in size and colour in the different 

 parts of their range, and too, as frequently different species 

 closely resemble each other, the determination of the species 

 is often a matter of considerable difficulty. It is not strange, 

 therefore, that differences of opinion exist among the writers 

 on this group as to the specific identity of certain forms, and 

 that many synonyms are to be found in our lists of species. The 

 species recognized by Chamberlin ('08) are separated by him as 

 follows: 



TABLE OF SPECIES OF LYCOSA 



A. Venter of abdomen black in front of the epigastric furrow 



and in a spot at the base of the spinnerets, elsewhere 



pale brown. Occurs in Colorado, Arizona, New Mexico, 



and Kansas. L. coloradensis 



AA. Not so. 



B. Lower margin of the furrow of the chelicerae armed with 



but two teeth. 



C. Anterior lateral eyes their diameter from the front 



margin of the clypeus. Occurs in Colorado, Utah, 



Oregon, Arizona, and California. L. kocbii 



CC. Anterior lateral eyes once and one half their diameter 



from the front margin of the clypeus. Occurs in 



Canada. L. beanii 



BB. Lower margin of the furrow of the chelicerae armed with 



three teeth. 



C. No spine at all above on the tibiae of the third and 



fourth legs. 



D. Dorsum of abdomen with a distinct median dark 



band along its entire length; light median band 



on the cephalothorax. P. 635. L. pikei 



DD. Dorsum of abdomen without such a dark band; 



cephalothorax without distinct markings. P. 636. 



L. fatifera 



626 



