172 PROCEEDINGS OF THE ACADEMY OF [^lay, 



season as well as at other times. The cocoon is more or less lenticular 

 inform, and shows a distinct seam about the equator, along which the 

 break is made when the spiderlings issue to mount the parent. The 

 cocoon is typically greenish-yellow or greenish-black, but only very 

 rarely white. The individuals of this genus rarely live more than one 

 year. 



Key to Species of Pardosa. 

 Females, 



1. Epigynal plate or area widest at anterior end, distinctly narrowing^ 



posteriorly; guide wider anteriorly than toward apex (PI. XIV, 



fig. 3), xerampelina (Keys.). 



Not as above, 2. 



2. Epigynum presenting each side of the guide posteriorly a sharply 



delimited, relatively small fovea as long as wide, the anterior 



region of epigynum scarcely depressed, 3. 



Not as above, 4. 



3. Posterior fovese angular in outline; posterior ends of lateral ridges 



separated by a distance much greater than their width; guide 

 behind with transverse arms (PI. XIII, fig. 5), . sternalis Th. 

 Posterior fovese smoothly rounded in outline; posterior ends of 

 lateral ridges not farther apart than their diameter ; guide with out 

 transverse arms (PI. XIII, fig. 8), atra Bks. 



4. Lateral furrows with the shallow anterior fossae short and narrow, 



behind these deepening and abruptly widely expanding, becoming 

 widest near middle of epigynum; septum of guide elevate, its 

 more depressed tranverse arms extending into excavations in 



theinnerfaceof the lateral ridges, 5. 



Not as above, 7. 



5. Transverse arms of guide bending backwards, septum of guide 



widest at posterior end, becoming gradually narrower toward 

 the anterior end, its sides substraight or but little curving 



(PI. XIV, fig. 6), groenlandica Th. 



Not so, 6. 



6. Transverse arms of guide bending more or less forward; septum 



abruptly widest immediately behind region of anterior fossae, from 

 there narrowing to end (PI. XV, fig. 3), modica var. brunnea Em. 

 Transverse arms bending more strongly forward ; septum widest 

 behind the middle of its length, typically expanded into a broad 

 plate-like form over the origins of tranverse arms which it usually 

 in large part covers (PI. XV, fig. 1), modica Bl. (type form). 



7. Face of septum of guide abruptly expanded behind into a large 



nearly circular plate, the diameter of which is clearly greater 

 than the length of the part of epigynum in front of it (PI. XIV, 



fig. 1), emerloni Chamb. 



Not so 8. 



