240 PROCEEDINGS OF THE ACADEMY OF [May, 



length of the chelicer??, protruding above over base; sides convex, 

 slanting below. 



Anterior row of eyes almost as wide as second, a little procurved; 

 anterior median eyes larger than the lateral, not fully their radius 

 apart, about as close as to lateral eyes; anterior lateral eyes their 

 diameter from eye^ of second row, twice their diameter from front 

 margin of clypeus; eyes of second row their diameter or slightly more 

 than their diameter apart, not fully half as far again from eA^es of 

 third row. Quadrangle of posterior eyes hardly one-fifth the length 

 of the cephalothorax. 



Lower margin of furrow of chelicerce with three equal teeth, the upper 

 jnargin with three as usual ; the smaller teeth above more than usually 

 stout. 



Legs distinctly increasing in thickness from the fourth to the first, the 

 first conspicuously stoutest; tarsi and metatarsi I and II densely 

 scopulate; tarsus III with scopula divided by a median setose band; 

 tarsus IV with scopulse much reduced, the scopular hairs being sparse 

 along each side, the setose band occupying most of ventral surface; 

 tibiae I and II and metatarsi I and II armed as usual, the spines of tibia? 

 usually slender and easily rubbed off or overlooked; patellae I and II 

 each armed in front with a spine ; tibiae III and IV without true spines 

 above; femora I and II bent forward, IV backward, less so; III nearly 

 straight. Tibia + patella IV shorter than cephalothorax ; metatarsus 

 IV much shorter than tibia + patella, but longer than tibia, less than 

 width of cephalothorax. 



For structure of epigynum see PI. XX, fig. 9. 



Total length, 20.2 mm. Length of cephalothorax, 10.1 mm.; width, 

 7.3 mm. 



Length of leg I, 23 mm. ; tib. + pat., 8.1 mm. ; met., 4.9 mm. 



Length of leg II, 20.5 mm. 



Length of leg III, 19.9 mm. 



Length of leg IV, 26.3 mm. ; tib. + pat., 9 mm. ; met., 6.9 mm. 



Syn. — 1881. Tarentula nidifex Marx, Am. Nat., p. 396. 

 1885. Lycosa nidifex (Marx) Emerton, Trans. Conn. Acad., VI, p. 487, PI. 

 47, figs. 4, 4a. 



1888. Lycosa arenicola Scudder, McCook, Proc. Acad. Nat. Sci. Phila., 1888, 

 p. 333. 



1889. Lycosa arenicola Scudder, Marx, Araneae N. A., pp. 561 and 594, note 

 3d. 



1890. Lycosa arenicola Scudder, Stone, Proc. Acad. Nat. Sci. Phila. 

 1892. Lycosa arenicola Scudder, Marx, Proc. E. S. W., II, p. 160. 

 1895. Lycosa arenicola Scudder, Banks, J. N. Y. E. S., Ill, p. 91. 

 1898. Lycosa arenicola Scudder, Simon, Hist. Nat., II, p. 341. 



