Tlie Craspedosomatidee of North America. 51 



joint -with distal half as on seventh leg; near the apex of the joint, and on the 

 Tipper side a lanceolate, thin, transparent, twisted process as long as the claw. 

 No secondary claws. 



Twelfth legs of male with a large, blnnt, conical median process on the 

 pedigerous lamina, directed ventro-cephalad. 



Genitalia of male (figs. 151-153) viewed from below (anterior face) with 

 the anterior arms dilated above the middle, suddenly twisted at apex and 

 deeply bifid, one of the divisions long and gently curved, the other broad and 

 in some cases at least, perforate. 



Posterior arm simple, clavate, the anterior corner above sharp and some- 

 what produced ; on the same side a short distance below is a tooth-like promi- 

 nence. 



Tenth legs of male with the coxal aperture near the middle of the joint. 



We have examined two male specimens, U. S. JS^at. Museum, 

 Xo. 446, no loealit}' given, but probably from Indiana. Exter- 

 nallj" thej' did not appear ditferent from the other species. 



The measurements of the joints of the legs were made with a 

 view of finding out whether specific difi'erences existed. The re- 

 lative proportions appear to be maintained, so that it does not 

 seem necessary to introduce measurements for the other species. 



Cleidogona vudii (Cope), 1869. 

 Pseudotremia nidii Cope: Proc. Amer. Philos. Soc, XL. j). 180. 



" This species differs from the last (^Pseudotremia cavernarum') 

 and resembles rather P. caesioannulatus of Wood. The points 

 separating it from the latter will be pointed out below. 



"Number of segments the same as in the P. cavernarum. twenty-nine, but 

 they are neither convex or rugose nor coarsely striate, but marked with a very 

 minute, irregular longitudinal striation. Segments cylindric, without shoul- 

 der, but with a small directed backwards on the posterior margin of the 

 lower part of the annulus, which is enlarged on the front segments. This 

 elevation is furnished on the anterior and posterior regions, and probably 

 eveiywhere in an uninjured condition, with a bristle. On the anterior seg- 

 ments a hair in front of each pore. Front plane, with finer and coarser hairs 

 sparsely distributed. Lateral margin -with an open notch. Antennae hairy, 

 with a bristle at the distal extremity of each joint. Lengths, 3d, 5th, 4th, 

 2d, 8th, 7th, 1st; the eighth joint longer than in P. cavernarum. Eye patch 

 triangular, not in a depression. Posterior segments considerably compressed, 

 the last segment with four transparent marginal bristles; extremity of body 

 slightly recurved. Total length eleven lines. 



"Color pinkish-brown, with a pale band from below to the ex- 

 ternal pore on each side of each annulus. Top of head black. 



