434 Wisconsin Academy of Sciences, Arts, and Letters. 



"The outer ramus of the fifth pair of feet in the female 

 three-segmented, the third segment small but distinct and bear- 

 ing two small spines. The basal segment bears a short, thick 

 spine at its outer distal angle. The unguiform process of the 

 second segment of this ramus is rather arcuate, denticulate 

 within and roughened on the outer margin. In addition to 

 the two spines on the third segment, this segment has a mi- 

 nute spine. The inner ramus is simple and almost equal to 

 the first segment of the outer ramus, is ciliated at the apex, 

 and bears two long equal spines. 



"Right fifth foot of male rather robust. The basal segment 

 is provided with a small spinous process near its inner prox- 

 imal angle. Second segment of the outer ramus short, being 

 about one and one-fourth times as long as broad, and bearing 

 the marginal spine at the distal angle. Terminal' hook long, 

 usually sigmoid, very minutely denticulate on the inner mar- 

 gin and tapering toward the apex. Inner ramus narrow and 

 barely reaching the middle of the second segment of outer 

 ramus, one-segmented and ciliate at tip. The second seg- 

 ment of the left male fifth foot is triangular, and ends in a 

 short, obtuse process. The inner side is expanded, ciliated, 

 and a strong, sharp spine projects a little below the middle of 

 this margin. The inner ramus is simple, slender, and ciliated 

 at the tip. 



"Length of female, 2.16 mm. Length of male, 1.60 mm. 



"This species resembles D. franciscanus Lillj. and D. sic- 

 ilis Forbes. It difi'ers from the former in the armature of the 

 male antenna and the form of the male fifth feet. From the 

 latter it differs in the structure of the female fifth feet, the 

 size and the shape of the male fifth foot. Both these species 

 have two-jointed inner rami in the male fifth foot, while in D. 

 Wardi they are simjjle. 



"The specimens upon which this description is based were 

 from the collections of Prof. H. B. Ward, for whom the 

 species is named, and w^ere collected by Edward Butler at 

 Spokane, Washington." 



While this paper was going through the press, the publica- 

 tion of Mr. Pearse, containing the above description, was re- 



