CAMBALOID MILLIPEDS LOOMIS 45 



First segment as long as the next two and a half segments to- 

 gether; surface finely reticulated; anterior corners inconspicuous, 

 very broadly rounded but not produced forward; anterior margin 

 straight; lateral margin very weakly rounded, descending obliquely 

 to the posterior corner and with a distinct raised rim ; posterior cor- 

 ner sharper than a right angle and clasping the side of the body; 

 lateral striations distinct, four to five, the middle longest, crossing 

 from behind to near the anterior margin. 



Segments 2, 3, and 4, viewed from the side, are almost flat along 

 the dorsum, much less convex than the ensuing segments, which 

 have the two divisions strongly separated by a transverse constric- 

 tion. Lateral striations increasing in height to segment 5, but not 

 reaching the line of the pores; thereafter receding gradually, and 

 on the caudal segments almost entirely confined to the ventral sur- 

 faces. 



Midbody segments with transverse constrictions very broad, rather 

 shallow, and containing a row of large, irregularly rounded, shallow 

 pits, frequently separated from one another by more than half their 

 width ; anterior and posterior subsegments convex, the posterior divi- 

 sion more strongly so and with fine, short, impressed longitudinal 

 lines in addition to the tiny reticulations that cover the surface; 

 anterior subsegments more coarsely reticulated. Pores located well 

 behind the transverse constriction near the anterior third of the 

 subsegment; each pore surrounded by a conspicuous, broad, flattened 

 rim. 



Last segment as long as the tAvo preceding segments together; 

 margin evenly rounded except for a short distance at the apex, be- 

 tween the two setae, where it is more truncate. 



Anal valves projecting behind the last segment; strongly inflated, 

 with margins meeting in a broad deep groove. 



Preanal scale a third as long as broad; transversely elliptic; the 

 hind margin more acutely rounded and with a seta on each side of 

 the middle; at each lateral angle a tiny, narrowly elliptic process 

 bearing a seta projects out from under the margin of the last segment. 



Male genitalia nearly concealed, the prominent overlapping pleu- 

 rae of segment 6 produced backward beyond the line of the margin 

 elsewhere and partly covering the opening in segment 7, which is 

 biarcuate behind and has the margin strongly raised and subrevolute. 



Male genitalia in two distinct parts. Anterior gonopods (fig. 

 14, a) differing from those of N. hurkei, as figured by Chamberlin,= 

 by having the ventral plate transverse at base instead of strongly 

 produced downward from the lateral angles; each anterior plate 

 with the apex produced into a short, slightly outward turned lobe, 



6Proc. U. S. Nat. Mus., vol. 61, art. 10, pi. 1, figs. 4-10, 1922. 



