1904.] NATURAL SCIENCES OF PHILADELPHIA. 313 



which joins the median one at the median groove; there is a broader 

 yellow submarginal band which does not extend to the head; the 

 remainder of the cephalothorax is pale brown. Sternum yellow like the 

 coxae, ■with a narrow brown margin. Ahdoinen above with a rather 

 narrow median yellow band largest at the anterior end and narrowing 

 to a point at the middle; from this point to the posterior end, with 

 more or less distinctness, is a series of 4-5 broad transverse yellow 

 markings, and a larger elongate yellow mark on each side of the median 

 band; all these yellow markings are demarcated by a ground color 

 of pale brown or dark greenish. The sides are mottled or streaked 

 with yellow or brown; the venter uniform pale yellow or pale brown. 

 E-pigynimi black. Chelicera and maxillce shining brownish, labium, 

 darker. Legs yellow, femora annulated with greenish or brownish, 

 a white ring at the middle of the tibise; in the c^ the tibise, tarsi and 

 metatarsi of I and II and the metatarsi of IV are darker than the other 

 joints. Palpi yellowish, in the cJ^ the tarsal joint is brown. 



Comparisons. — ^This species differs from the related liber mainly in 

 form; greater relative length of legs; their greater hairiness; sides of 

 the head very oblique in the d" instead of vertical; the posterior 

 decHvity of the cephalothorax in the 6^ much less steep. 



Habits. — ^'ery abundant at Austin, under moist stones close to 

 water. 



Key to the North American Genera of Pisaurid^. 



(This key has been compiled from Simon, 1898, since I have not seen 

 representatives of the genera Maypacius and Thanatidius.) 



a. 1. — Area of the middle eyes longer than Inroad; tarsi usually pro- 

 vided with an onychium. 

 b. 1. — First eye row strongly procurved, the lateral usually larger 

 than the middle eyes ; clypeus narrow. 

 c. 1. — Lateral anterior eyes with the middle anterior occupy- 

 ing an area not broader than long, 



Maypacius Simon, 1898. 

 c. 2. — Lateral anterior eyes with the middle anterior occupy- 

 ing an area much broader than long, 



Thanatidius Simon, 1898. 

 b. 2. — First eye row straight, eyes subequal; clypeus broad, 



Pisaurijia. 



a. 2. — Area of the middle eyes broader, or not less broad, than long; 



tarsi without an onychium, Dolomedes. 



