690 PROCEEDINGS OF THE NATIONAL MUSEUM. 



Copulatory legs very slender above the short and bulbous base of the 

 second joint; broader at the first flexure, beyond which they are turned 

 slightly laterad and describe a curve of more than a circle; not attenu- 

 ate distad, divided near the a[)ex into two stout prongs, the slender 

 apex of the larger being recurved to point toward the apex of the 

 shorter; nodus rudimentary. 



The form of the first segment, as well as that of the whole body, and 

 the character of the dorsal sculpture, suggest an affinity of this genus 

 with iSphenodesmufi, but the armature of the sixth segment and the 

 shape of the copulatory legs render diagnosis easy. 



The lateral turn and s[)iral curve of the copulatory legs are some- 

 what as in Neodesmus, but the large nodus there i)resent, as well as the 

 attenuate and elongate flagellum, render the form in reality very 

 dissimilar. 



The form of the process of segment 6 will readily distinguish this 

 genus from all others yet known. The next genus is the only one bear- 

 ing even a remote similarity in this respect, and it is very distinct in 

 the form of the copulatory legs. The fcuMu of the first segment, the 

 rngulose dorsal surface, and the dark-brown color suggest Sphenodes- 

 mus, which is distinct in the undivided process of segment C, the form 

 of the copulatory legs, and in the 10 olfactory cones of the antennae 



The long, spiral, copulatory legs indicate i)0ssible affinity with Porat's 

 EurydeHmus caffrarius here placed provisionally in the genus Xeodcs- 

 mus, but as the process of segment 6 is described as simply triangular 

 and the size is considerably greater than that of U. micravima, it 

 seemed better not to refer it to riodesmus. 



ULODESMUS MICRAMMA, new species. 

 (Plato LVI, ligs. la-lc.) 



Vertex without hairs, convex and ])romiuent, the surface coriaceous 

 or subrugulose; sulcus and suture distinct, meeting the suboblique 

 interocular sulci at the lower end; the lower end of the vertical sulcns 

 and the oblicjue sulci are more distinctly rngulose. 



Clypeus with two pairs of setiferous punctations and a few others 

 somewhat irregularly placed above the supra-labral groove, which is 

 densely hirsute and punctate; lateral edges of clypeus slightly emar- 

 ginate, the corners rounded. 



Labrum with margin nearly transverse, the emargination narrow 

 and shallow. 



First segment subreniform, tlie anterior margin convex, carried 

 around at the sides to an evenly rounded lateral carina about equal in 

 lateral and ventral projection to that of the second segment; raised 

 margin of anterior and posterior edges distinct, carried around the 

 lateral corner without being widened into a distinct callus; surface 

 coriaceous, especially on the carina?; posterior margin slightly emargi- 

 nate mediauly. 



