222 kobert h. wolcott: 



also proportionately stouter and more tapering, its base being nearly as 

 thick as that of 3, while the distal end is only one-half as thick as the 

 proximal; its breadth in the middle is a little over one-half its length. The 

 papillae on this segment are rather more prominent than in A. abnormipes. 

 5 is similar to that of that species but the claws are more slender and a 

 little farther apart, and the ventral distal angle a little more produced. 



Epimera. — Of the same general character as in A. abnormipes, but 

 differing in the following respects: They occupy slightly less than a pro- 

 portionate amount of the ventral surface; the space between the groups of 

 epimera is a little greater and the inner ends of the first pair do not 

 approach closely to each other but leave a considerable interval behind 

 the maxillary shield. This is owing to a shortening of I and is accompa- 

 nied by an increase in the curvature of the posterior margin of the plate 

 formed by it and II, which margin is also indistinctly angled toward the 

 base of II. The posterior margin of IV does not project so far posteriorly 

 and so the genital field is not to such an extent enclosed by it. 



Legs of female relatively longer than in A. abnormipes and very 

 slightly more slender. I is one-tenth shorter than the body, II and III 

 about one-fifth longer and of the two, II a trifle the longer, IV two-fifths 

 longer than the bodj'. Individual segments of each leg in order of length 

 4, 6, 5, 3, 2, 1, except in IV, where the last three are 6, 5, 4. Number and 

 distribution of spines on the legs about the same as in A. abnormipes; a 

 row of long spines on the flexor surface of segments 4 and 5 of leg IV; the 

 tip of 5 in each leg armed by several long spines. 



In the male, I slightly exceeds the body-length; II, III and IV are each 

 a little over two-fifths longer, and of these IV is slightly longer than II and 

 that slightly longer than III. Segments in I and II, in order of length 4, 

 6, 5, 2, 3, 1; in III, 5 is longer than 6, and in IV, 6 is less than 2 or 3, this 

 shortening leading to a shortness of the whole leg. The same three 

 spines are present at the distal end of IV 5, but are not so long — not quite 

 two-thirds the length of 6. IV modified in a similar manner to the same 

 in A. abnormipes, but differing in the following details: Spines on 3 much 

 more numerous; on the posterior surface of 4 the spines are longer and 

 more numerous, and on the ventro-anterior surface are eight spines, three 

 in a dorsal and five in a ventral row; the distal portion of this segment is 

 not so much compressed, and the ventral surface is quite evenly convex; 

 5 is thicker, has a row of ventral spines as in A. abnormipes but only one 

 long heavy spine in the middle of the dorsal surface instead of two. 

 Claws similar except that the accessory tip is one-third the length from 

 the end of the principal one. 



Genital area as in A. abnormipes in form except that the angle which 

 separates the plates of the two sides anteriorly is more acute here than in 

 A. abnormipes. Acetabula in males usually seven on each side — in one 

 specimen eight— with an indefinite separation into two groups. In the 

 female are three and six on the two plates of either side, in one case four 

 and five on one side and three and six on the other. 



