1892.] NATURAL SCIENCES OF PHILADELPHIA. 79 



project beyond the end of abdomen ; pale above and brown 

 beneath, a brown stripe on each lower side; venter with a few 

 small brown spots mixed in with the silvery ; epigynum brown ; 

 sternum brown with white hairs ; abdomen with white hairs ; 

 cephalothorax low; quadrangle of eyes wider behind ; second row 

 of eyes half way between lateral and dorsal eyes ; anterior M. E. 

 very large ; head overhanging the mandibles ; abdomen swollen 

 witli eggs ; broadest behind the middle ; anterior coxai nearly 

 touching; posterior coxte touching; sternum widest between coxse II 

 and III; legs short, first pair stoutest: epigynum as figured on 

 Plate II, fig. 34. 

 One specimen. 



Marptusa familiaris Hentz. 

 Common. 



Marptusa rupicola Hentz. Plate IV, figs. 49 and 49a. 



Total length 9 10-4mm. 



Length of cephalothorax 4*5mm. breadth 3*5mm. 



Length of abdomen 6" mm. breadth 3* mm. 



Male about same size, abdomen a little narrower. 



Cephalothorax red-brown ; eye-region black ; hinder sides 

 brownish, and a brownish angular cross-band behind, leaving only 

 a yellow-brown spot on hind margin ; mandibles red-brown ; first 

 leg yellow-brown, much darker at ends of joints; other legs more 

 yellowish with indistinct darker rings ; sternum yellowish ; anterior 

 coxre separated, posterior ones touching ; venter gray or yellowish ; 

 in female with a faint darker median stripe ; epigynum reddish, as 

 is also the region of the male openings ; spinnerets light; dorsum 

 and sides dark gray with a light central stripe, the posterior part of 

 which is made up of chevrons, and contains a more or less distinct 

 serrated narrow gray stripe ; other light spots and lines are mixed 

 in with the gray on the sides, especially in the ^ ; body covered 

 with white hairs; a cluster of stiff black bristles just below and 

 behind the lateral eyes. Cephalothorax broad and low ; eye-region 

 a little broader in front than behind, more so in $ than in 9 ; 

 dorsal eyes look more dorsad than in 31. familiaris. 



Resembles the dry cliffs on which it is found ; in Fall Creek and 

 Six Mile Creek ; three specimens ; the first pair of legs of the $ is 

 very stout and long ; patella and tibia I measuring 5*5 mm. 



