50 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 89 



portion sharply raised above the broadly expanded anterior margin, 

 which is divided by radiating" lines into 10 elongate areas ; disk with 

 two transverse rows of large tubercles, entire dorsal surface, including 

 the tubercles and the expanded margin, very finely roughened. 



Second segment with the lateral margin of the carinae half again 

 as long as segment 3, divided into three lobes by two very long, nar- 

 row, usually dirt-filled slits ; front lobe of each keel raised ; its anterior 

 margin partly covering the oblique posterior margin of the first seg- 

 ment ; middle lobe depressed below the level of the others. 



Dorsum of segments 2 to 19 inclusive with four longitudinal rows 

 of slightly convex, transverse areas, there being two such areas in 

 each row and in the center of each area is a large, rounded-conic 

 tubercle. The two rows of tubercles on each side of the faintly in- 

 dicated median line extend obliquely mesad toward the back of each 

 segment, especially the outer row. On the antepenultimate segment the 

 last tubercle in each inner row is larger than the tubercles on any other 

 segment and projects up and back, slightly exceeding the posterior 

 margin. The lateral margin of each carina has a deep, narrow incision ; 

 the anterior and posterior margin each with three sublageniform in- 

 cisions ; these incisions, and particularly the one in the lateral margin, 

 usually filled with dirt. Pores very inconspicuous, apparently present 

 on segments 5, 7, 9, 10, 12, 13, 15-18, near the posterior corner of 

 the carina. 



Penultimate segment with the outer margins of the carinae converg- 

 ing backward very sharply, the posterior margin of each carina very 

 short, the posterior corner only slightly produced, exceeded by the 

 two projecting median tubercles of the dorsum. 



Last segment almost or entirely hidden by the penultimate segment ; 

 posterior margin with three rounded, setiferous tubercles on each side ; 

 the papilliform process beneath the apical margin. Ventral margin on 

 each side with a conic tubercle opposite the middle of the valve. 



Anal valves slightly convex, margins broad and slightly elevated. 



Preanal scale truncated at apex, a setiferous tubercle at each angle 

 of the truncation. 



Legs not reaching beyond the lateral carinae ; joint 3 equaling or 

 exceeding joint 6. No secondary sexual differences noted in the legs. 



Sterna narrower than the length of a basal joint of a leg, crossed 

 in each direction at middle by a deep furrow ; without special modifica- 

 tions in either sex. 



Gonopods with a large, clypeate basal joint opening inward, the 

 terminal joint with an enlarged base supporting an erect process below 

 which, on the inner side, a sicklelike blade projects backward, the tip 

 turned upward. 



