588 PROCEEDINGS OF THE ACADEMY OF [AugUSt, 



obscure rings ou the oilier joints, the distal ends of the tibise and 

 tarsi black. Palpi annulated buff and reddish-brown. 



Comparisons. — Of all the species of Dolomedes described by 

 Hentz D. urinator is most similar to this one. It agrees with his 

 fig. 3, PI. XVI, in the eyes and the general coloration, but his 

 description is very meagre. Whether the form described by Emer- 

 ton is tenebrostis Hentz I cannot decide from his description, and 

 Emertou's figure of the epigynum (9c, PI. XLIX) shows differ- 

 ences from the species described by me. 

 33. Dolomedes idoneus n. sp. (PI. xxx, fig. 51.) 



(?, type. West Chester, Pa., author' s collection ; another mature 

 ? from Harvey's Lake, Luzerne county. Pa., Stone Coll.) 



Eyes. — First row broader than the second by about half the diam- 

 eter of one of its lateral eyes which are slightly higher and slightly 

 smaller. Eyes of the second row not quite their diameter apart. 

 Third row widest, its eyes about as large as those of the second row. 



Form. — Cephalothorax much of the same form as in urinator. 

 Chelicera massive, their length less than twice the height of the 

 head in front. Legs stouter than in urinator. Sternum a little 

 longer than broad. 



Dimensions. — Length of cephalothorax, 10,2 mm. 



Length of abdomen, 12.5 mm. 



Length of first leg, 40 mm. 



Length of second leg, 39.2 mm. 



Length of third leg, 37 mm. 



Length of fourth leg, 41 mm. 



Color in Alcohol, type. — Cephalothorax reddish-brown, its mark- 

 ings very similar to those of D. urinator, but no black mark at the 

 posterior eyes, and the wedge-shaped marks just in front of the 

 dorsal groove very indistinct. Stemtim yellowish with blackish 

 margin. Abdomen above yellow and brownish-black, the yellow 

 forming a median stripe on the anterior third of the dorsum ending 

 posteriorly in a blunt point, a large spot on the middle, irregular 

 arches on the sides of the dorsum, and a median row of indistinct 

 spots on the posterior dorsum ; sides dark-brownish, somewhat 

 streaked wdth yellowish ; venter behind the lung slits brown, lighter 

 than the sides, with two parallel dark lines on each side of the 

 mid-line. Epigynum black, except the large rounded part which 

 is bright red. JJimg books paler than the venter. Chelicera deep 



