ATOPETHOLID MILLIPEDS — HOFFMAN AND ORCUTT 143 



Segments with a distinct transverse constriction, the posterior subsegment 

 distinctly thicker and more convex than the anterior; repugnatorial pores located 

 in front of the constriction; pores followed on posterior subsegments by a very 

 distinct longitudinal sulcus. . . . 



Anterior legs of male with claws very large, as long as distal joint; first two pairs 

 strongly crassate; legs 3 to 7 with coxae only slightly produced; second joints 

 with a rounded prominence below distad; other joints normal. 



From the original species description, the following is taken : 



Length of male 38 mm., width 3.8 mm.; female 39 mm. by 4.2 mm. 



Colors in alcohol black and dull yellow or clay-color. Segments in front of pos- 

 terior suture dull black to below the pores; posterior zone reddish above, the ventral 

 surface, legs, and antennae clay-color. 



Clypeal foveolae five on each side; some distance above the foveolae two oblique 

 rows of small irregular depressions, the rows converging upward. 



First segment with a very distinctly raised anterior margin extending from the 

 lateral corners to near the e3^es where the limiting groove bends inward and is 

 suddenly obhterated. The edge is concave along the raised margin, to accommodate 

 the inflated angle of the head, and the lateral corner is rather pointed. 



Segments nearly smooth above; in front of the constriction they are quite even, 

 but the black surface does not shine. Behind they are abruptly thicker and 

 distinctly covex; the surface shines though it is less even, being marked by indis- 

 tinct and irregular longitudinal shallow grooves or depressions. The suture of the 

 median line is marked by a fine sulcus, and that behind the pore is deep and dis- 

 tinct. The longitudinal grooves become more distinct below the pores, and pass 

 gradually into the normal striations more than halfway down to the legs. Pleural 

 sutures distinct but less so than the others. The surface of the anterior part of 

 each segment below is ornamented with a deUcate network which takes the place 

 of the concentric striations. 



Last segment very broadly and evenly rounded, the surface inflated and convex, 

 both above and on the sides. Anal valves evenly convex, poUshed, and shining. 



Gonopods of male as in figure S,a,b. Sternite of the anterior 

 gonopods strongly produced mesiad into a subtriangular distally 

 notched process extending distad almost to the ends of the coxal 

 apices. Proximal margin of sternite with a deep median notch; 

 sternal apodemes long and slender, only slightly expanded distally, 

 bent somewhat mesiad, imperceptibly fused with the caudal side of 

 the coxite. The latter elongated and rather slender, the distal end 

 spatidate and slightly concave on the caudal side, the coxal apodeme 

 short and distinctly set off from the rest of the joint. Telopodite 

 moderately large, flattened, its apical lobe recurved caudolaterad. 

 Posterior gonopod with a stout short apodeme, the distal end strongly 

 expanded (fig. 8c). Coxite composed of two pieces diverging from a 

 common base; the telopodite attached by a movable joint, slender, 

 arcuate, the caudal edge produced into a broad flange that distally is 

 enlarged into a triangular lobe just before merging with the main body 

 of the telopodite; extreme terminal end strongly recurved, bifid or 

 with a small subapical dentation. 



Discussion : Comparison of the drawings of this species with those 

 published by Chamberlin for Onychelus jaegeri and 0. medolus shows 



