52 PROCEEDINGS OF THE NATIONAL IMUSEUM vol. 86 



qiiely descending to the back corner, which is not quite a right angle 

 and clasps the side of the body; lateral surface striate. 



Segments 2, 3, and 4 with the sides gradually converging behind, 

 necklike, the posterior margin of segment 4 only three-fourths as 

 wide as segment 1. Segments 2 and 3 flat, not at all convex, dorsum 

 smooth, the sides with striations. Segment 4 with the anterior sub- 

 division somewhat exposed ; the posterior subdivision moderately con- 

 vex and with crests as on the subsequent segments, but less distinct. 



Anterior division of the midbody segments moderately convex; 

 crossed behind by a series of channels nearly twice as long as broad 

 and usually with a large, deep, round or oval pit occupying the 

 back half of each channel ; channels separated from each other by a 

 thin raised ridge; in front of the channels the surface is coarsely 

 and distinctly honeycomb-reticulated. Posterior subsegments 

 abruptly elevated from the constriction but with the dorsum flat, 

 not at all convex as seen from the side; between the prominent 

 ])oriferous carinae are six to eight thin and high longitudinal crests 

 crossing the subsegment, the inner pair conspicuously thicker and 

 liigher than the others and more widely separated, the smaller crests 

 number two to four on each side with three the rule. Lateral carinae 

 ])rominent, abruptly elevated from the sides, greatly thickened in 

 front into a broad, oval area with a rather large depression contain- 

 ing the pore; posterior part of the carina thin, ending in a right 

 angled corner above the posterior edge of the segment. Beginning 

 on segment 5 and for several segments thereafter the pores are borne 

 on broad, rounded elevations rather than on a definite carina. Be- 

 low the poriferous carinae are 12 to 15 longitudinal striations. 

 Penultimate segment with dorsal crests and lateral carinae almost 

 as strong as those on the foregoing segments. 



Last segment smooth and shining, the dorsum scarcely convex in 

 lateral view, not quite so long as the two preceding segments to- 

 gether; posterior margin thickened, especially at the apex, which 

 bears two setae and is narrowly rounded and projects a little beyond 

 the valves but not as a cons])icuous mucro. Valves little inflated and 

 with margins meeting in a narrow, shallow groove. Preanal scale 

 almost four times as broad as long, the posterior margin nearly 

 straight; tab processes small. 



Segment 6 with the margin around the gonopods scarcely raised 

 but the overlapping pleurae are strongly produced backward, nearly 

 covering the gonopods. Segment 7 vrith the genital opening semi- 

 circular, the margin not separately raised. 



First and second male legs smaller than ensuing legs, with well- 

 developed claws. Sixth and seventh male legs with a process on the 

 inner side of the penultimate joint somewhat similar to that in the 

 same position in NannoJene. 



