234 SMITHSONIAN MISCELLANEOUS COLLECTIONS [VOL. 50 



as the first ; the third is as long as the second ; the fourth is one and 

 a half times longer than the third ; the fifth is one and a half times 

 longer than the fourth. The flagellum is composed of three articles, 

 the second one being longer than either of the other two, which 

 are about subequal. 



The first segment of the thorax is longer than any of those fol- 

 lowing, which are subequal. The first segment is 6 l / 2 mm. in 

 length. Each of the following six segments is 4 mm. long. The 

 coxopodites of the first segment form a rather wide and very 

 thickened marginal border on either side, separated from the seg- 

 ment by a deep furrow, wider anteriorly than posteriorly and not 

 extending to the post-lateral angles of the segment. They are not 

 cleft posteriorly and are not represented on the underside by any 

 ridge or fold or thickness of the surface. The posterior margin is 

 entire. The coxopodites of the second and third segments are 

 present on the underside in the form of a slightly thickened ridge 

 on the anterior margin of the segment. 



The first two segments of the abdomen have the lateral parts 

 covered by the seventh thoracic segment. The lateral parts of the 

 following three segments are well developed and are produced 

 backward. The third and fourth segments are slightly longer than 

 the first, second, and fifth segments, which are subequal in length. 

 The first, second, and fifth segments are each about iy 2 mm. long. 

 The second and third segments are each about 2 mm. in length. The 

 sixth or terminal segment is triangular at the base, with the apex 

 produced in a short triangular process, the sides converging gradu- 

 ally to a rounded extremity. The basal article of the uropoda is 

 somewhat quadrangular in shape and occupies all the space be- 

 tween the lateral angles of the fifth segment and the produced 

 apical process of the sixth segment. It extends a little beyond 

 the lateral angles of the fifth segment and the apical process of the 

 sixth segment. The posterior margin is excavate between the lateral 

 angles, which are produced in lobes on either side. The inner 

 lobe is slightly longer than the outer lobe. A carina extends longi- 

 tudinally along the exterior margin of the basal article. The outer 

 branch is rather large and extends half its length beyond the inner 

 lateral angle of the basal article. The inner branch is long, extend- 

 ing beyond the apical process of the sixth abdominal segment and 

 beyond the inner angle of the basal article, almost or quite to the 

 extremity of the outer branch. All the legs are ambulatory. 



Only one specimen was collected by Dr. O. F. Cook at Mt. Coffee. 

 Thp type is in the possession of Dr. O. F. Cook. 



