1890.] NATURAL SCIENCES OF PHILADELPHIA. 433 



D. tenebrosus Hentz. (1*1. XV, fig. 8.) 



Cephalothorax brown with a broad light marginal band and a light 

 one behind the eyes terminating in a point in front of the dors^al 

 groove. There are also several dark radiating lines. The abdomen 

 is gray and brown with several transverse black angular marks re- 

 sembling the letter W, across the posterior portion. On the anterior 

 part are two longitudinal black bands enclosing a lighter space be- 

 tween them, all these black bands are bordered with light buff. Be- 

 neath uniform brown. The coloration varies considerably in differ- 

 ent individuals especially with age. Legs banded with brown and 

 gray. Length of female 25 mm. from tip to tip of legs stretched 

 longitudinally 90 mm. 



This species is abundant about water, often inhabiting spring 

 houses and boat houses. The female carries her bag of eggs in 

 August and the young have been observed in a rough web on weeds 

 early in September. This spider runs over the surface of water 

 readily and frequently goes beneath when pursued. The male I 

 have not seen. 



D. sexpunctatus Ilentz. 



Cephalothorax reddish-brown with a bright silvery white band 

 on each side. Abdomen brown with a similar band on each side 

 and two rows of white dots down the back. Beneath brown. Leg& 

 uniform brown. The white markings do not show when the spider 

 is wet with alcohol. From the note in Dr. Marx's Catalogue there 

 seems to be some confusion about the male of this species and the 

 preceding. I have a specimen from York Co., Penna., which I think 

 is undoubtedly the male of D. sexpunctatus as it is just like the female 

 except that the ground color is lighter, it having just cast its skin, 

 and the white spots are all surrounded with black. Length of fe- 

 male 11 mm. 



I have taken the female at Pt. Pleasant, N. J. near the beach. 

 Dr. McCook has taken it at Philadelphia. 



Explanation of Plate XV. 



Fig. 1. Pirata marxi, female. 

 Fig. la. Epigynum of same. 

 Fig. 2. Lycosa frondicola, female. 

 Fig. 2a. Same, under side of abdomen. 

 Fig. 2b. Same, epigynum. 

 Fig. 3. Lycosa kochii, female. 

 29 



