384 PROCEEDINGS OF NATIONAL MUSEUM vol. 99 



tarsal joint longer than proximal two, and as long as femur. Coxae of 

 second pair of legs of male with cylindrical, distally truncate proc- 

 esses. Sternites of fourth male legs with conical knobs. Pregenital 

 legs more hirsute than posterior. 



Gonopods in situ lie parallel and directed cephalad between the 

 bases of the seventh pair of legs, the tips of the lateral processes 

 crossed. Telopodite composed of two elements, a smaller bladelike 

 mesial process, which, when seen in cephalic view, projects distad 

 from mesial side of base of telopodite, the tip slightly acuminate and 

 twisted, reaching almost to end of lateral process. Latter a spini- 

 form mesially directed shaft, tapering distally from a cylindrical 

 basal portion, on the base of which is the usual cephalolateral setif- 

 erous shoulder. 



In life, tergites blackish ; most of keels reddish pink. Underparts 

 of body whitish gray. Head brown with a wide light margin along 

 the edge of the labrum ; antennae olive-gray with the basal and termi- 

 nal articles white. 



Type specimen. — Male holotype in the U. S. National Museum, No. 

 1806, collected by Hobbs and Wilson on July 12, 1947. 



Tyj)e locality. — A deep, shady, steep-sided ravine beside U. S. Route 

 460, about 2 miles south of Glen Lyn, Va., in Mercer County, W. Va. 

 Forest cover of deciduous trees such as maple. 



Remarks. — This species is related to N. simplex^ differing chiefly 

 in the bladelike mesial process of the gonopod, and in having the front 

 of the head with a wide light margin. 



NANNARIA SIMPLEX, new species 



Plate 27, Figures 13, 14 



Diagnosis. — A medium-sized member of the genus characterized by 

 the structure of the male gonopods, in which the telopodite blade is 

 deeply divided, the lateral process being longer and curved mesiad 

 over the end of the short spiniform mesial process. Head entirely 

 black. 



Description. — Length of holotype, 27.7, width, 4.8 mm. Body width 

 averages 17 percent of length. Segments between second and fifteenth 

 of full width, body abruptly rounded in front, gently tapering behind. 



Collum large, subtrapezoidal in dorsal aspect, sides straight with a 

 very small marginal ridge, front slightly concave. Posterior margin 

 emarginate across body ; posterior corners angular. Collum as long as 

 succeeding two segments combined. 



Second segment with keels shorter than tergite at midline, pos- 

 terior edges of keels tapering cephalad, lateral edges with well devel- 

 oped marginal ridges. Segments 3 through 15 subsimilar, anterior 

 corners of keels rounded, posterior corners directed slightly caudad ; 



