450 Wisconsin Academy of Sciences, Arts, and Letters. 



Tlie sj)iiies of the first, basal s-egmeiits of the male Hftli feet 

 are long and slender. The second basal segment of the right 

 foot is nearly twice as long as wide. The lateral hair is long 

 and slender and sitnated on the distal fourth of the segment. 

 On the posterior surface not far from the middle line are two 

 hyaline lamellae projecting inward. The proximal lamella 

 is accompanied with a spine, and the distal lamella with a re- 

 curved hook. The first segment of the exopodite is twice as 

 long as broad, and has a blunt process on its outer distal angle. 

 The second segment is twice as long as the first, is slender, 

 very narrow at the proximal end, and grows gradually wider 

 towards the distal end. The lateral spine is near the distal 

 end, is rather long, and nearl}' straight. The terminal hook 

 is very stout, almost conical in shape, and much shorter than 

 the second segment. The endopodite is very small, appearing 

 as a small process on the inner distal angle of the second basal 

 segment. The length of the second basal segment of the left 

 male fifth foot is a little less than twice its width. It is slightly 

 concave on the outer margin. The lateral hair is situated well 

 towards the distal end of the seginent. The fixst segment of the 

 exopodite is three times as long as wide, and somewhat concave 

 on both the inner and outer margins. The distal inner angle is 

 setose. The second segment of the exopodite is slightly concave 

 on the inner margin, and is terminated with a finger-like proc- 

 ess and a longer falciform spine. The endopodite is long and 

 slender, reaching beyond the first segment of the exopodite, 

 is obscurely two-segmented, and is setose at the tip. 



Length of female, 1.49 mm. Length of male, 1.325 mm. 



This w^as found in collections made by Professor Birge at 

 Slidell, Louisiana. Only a few specimens were found, but it 

 seems to be a well-marked species. It resembles in many re- 

 spects D. Lintoiii and D. slagnalls, but differs in some marked 

 particulars. 



The noticeable points of difference from D. Llntoni are the 

 form of the ap])endage of the antepenultimate segment of the 

 right male antenna, tlie form of tl)e teriuiual segment and hook 

 of the right male exopodite, and tlic teruiinal setae of the en- 



