240 robeet h. wolcott: 



The epimera cover only about one-third the whole ventral surface. 

 The two groups of each side leave but a narrow interval between them, 

 but the space between those of opposite sides is wider, especially in the 

 case of the anterior pair. The epirnera of the male are relatively larger 

 and closer together than in the female. I and II form a roughly triangu- 

 lar plate with a rounded inner angle, and from the inner end of the pos- 

 terior margin of II a short, stout, curved process runs back beneath III. 

 Of the plate formed by III and IV, III furnishes about one-third. This 

 plate is longest externally, narrowed toward the median line and the 

 inner end is rounded. All epimera are relatively thick. 



Legs relatively short and stout, and the first pair slightly heavier 

 than the rest. In females not distended with eggs and in males the first 

 leg is a little over one-half the body length, II is a little longer than I, III 

 is longer still and over three-fifths the length of the body, and IV is longest 

 but still less than the body-length. The proportions seem to be about the 

 same in the two sexes. Of the individual segments, 5 is in all legs the 

 longest, 6 about equal to it except in IV where 5 is slightly lengthened, 

 and 4 next in length . The distal segments are nearly as thick as the 

 proximal which gives the legs a rather clumsy appearance. Spines are 

 comparatively very few and all short and stout; aside from this they are 

 peculiar only in the fact that each segment except 1 and 6, bears at the 

 distal end, a group of from four to six of these short, stout spines. The 

 claw is received in the end of 6 in a manner similar to that found 

 in A. ypsilophorus and the distal end of the segment is slightly expanded. 

 The claw is long, slender, strongly curved and slightly angled at two- 

 thirds the distance from the base, in the case of all but the first leg. In 

 the case of I, the claw is stouter, shorter and evenly curved, but like all 

 the rest simple and sharply pointed. 



Genital area not at the end of the body but close behind the last 

 epimera and so produced toward either side that the total breadth is 

 about the same as the distance between the outer margins of the posterior 

 groups of epimera, and approximately two-thirds the width of the body. 

 Each plate has an outline roughly that of a right-angled triangle, the base 

 of which corresponds to the anterior margin, the hypotenuse to the pos- 

 terior margin, while the short inner margin represents the altitude. The 

 latter margin lies at a short distance from the genital cleft in the female, 

 but in the male bounds it, and meeting the plate of the opposite side in 

 front and behind, surrounds it. The anterior margin is nearly straight, 

 the posterior slightly convex and the outer end rounded. The acetabula 

 are numerous and vary in size, two toward the outer end of each plate 

 being larger than any of the rest. 



MEASUREMENTS: 



Male Female 



Length of body 1.503 mm. 2 330 mm. 



Length of leg 1 0.826 mm. 1.264 mm. 



Length of leg II 0.862 mm. 1.346 mm. 



Length of leg III 0.943 mm. 1.581 mm. 



Length of leg IV 1.367 mm. 2.017 mm. 



Length of palpus 0.469 mm. 0.821 mm. 



