1904.] NATURAL SCIENCES OF PHILADELPHIA. 311 



clypeal margin and the second row, eyes equal, straight or the middle 

 eyes slightly higher. Eyes of the second row largest, 1.3 times their 

 diameter apart. Third row broadest, its eyes nearly twice their 

 diameter behind the second row. Quadrilateral of the posterior eyes 

 broader than long. Length of the dorsal eye area to the cephalo- 

 thorax as 1 : 4.8. 



Form. — Cephalothorax in front rounded (?) or truncated straight 

 (c?), almost ( 9 ) or decidedly less (6^) than one-half its greatest trans- 

 verse diameter, about equally high at the posterior eyes and the middle, 

 the eyes projecting in front of the clypeus. Chehcera with 3 pairs of 

 teeth, nearly straight anteriorly, their length greater than the width of 

 the clypeus and about 1.8 times the height of the head in front . Labium 

 longer than broad, about one-half the length of the maxillae, truncated 

 (?) or rounded (c^) apically. Posterior spinnerets nearly double the 

 length of the anterior. Metatarsus IV shorter than the patella and 

 tibia combined ; length of leg IV to cephalothorax ( 9 ) as 3.3 : 1. 

 Inferior tarsal claw with 1 tooth. 



Pirata liber Montg. 



Pirata liber Montgomery, 1902, 1903. 



(Numerous specimens from Pennsylvania, New Jersey and Massachu- 

 setts.) 



Eyes. — First row almost or quite as broad as the second, straight, 

 equidistant from the second row and the clypeal margin, eyes adequal. 

 Eyes of the second row 1.3 times their diameter apart. Length of the 

 dorsal eye area to the cephalothorax as 1 : 5.5. Quadrilateral of the 

 posterior eyes much broader than long. 



Form. — Cephalothorax very slightly higher behind the middle than 

 at the posterior eyes (?) or decidedly highest at the median groove (c?) ; 

 the median groove lies on the dorsal surface and not on the posterior 

 declivity, this declivity being very abrupt in the c^ ; the cephalothorax 

 in front is almost (?) or decidedly less (c?) than one-half its greatest 

 transverse diameter ; the sides of the head nearly vertical ( c? ) or more 

 oblique ( ? ). Chelicera with 3 pairs of teeth, weak and straight in front, 

 their length about 1.75 times the height of the head in front and (in 

 the ? ) shorter than the width of the clypeus. Labium large, truncated 

 apically, longer than broad, fully one-half the length of the maxillse. 

 Sternum longer than broad. Posterior spinnerets more than twice 

 the length of the anterior. Metatarsus IV a little shorter than the 

 patella and tibia combined. Length of leg IV to cephalothorax ( ? ) 

 as 3.3 : 1. Palpi and legs with long soft hairs, most noticeable on the 



