156 PROCEEDINGS OF THE NATIONAL MUSEUM vol. m 



situated on posterior lateral siu'face of genital segment, consisting of 

 2 nodules, each in slight depression; anteriormost nodule with single 

 plumose setule, posterior with 3 plumose setules. 



Abdomen 1-segmented, distinct from genital segment, anterior half 

 slightly swollen, posterior half straight, anal identation in medial 

 posterior surface formed by pair of small, lappet-like projections. 

 Caudal rami (fig. blh) short, rounded distal half of inner margin 

 plumose, distal sm-face with 4 plumose setae and 2 plumose setules, 

 1 on either side of setae. 



Male cephalothorax (fig. 57a) similar to that of female. Free 

 fom'th pedigerous segment distinct from cephalothorax, fused with 

 genital segment, shape as in female. Genital segment (fig. 57e) 

 narrow anteriorly, broader posteriorly, with slight indentation at fifth 

 leg and with small, lobate projections from posterior ventral siu-face. 

 Fifth legs (fig. 57/) consisting of 2 plumose setules; sLxth legs (fig. 57/) 

 arising from 1 of lobate projections on posterior ventral sm-face of 

 genital segment, consisting of 3 plumose setules. Abdomen and 

 caudal rami similar to those of female although anterior end of abdo- 

 men not swollen as in female. 



Female and male antennule (fig. 58a) 2-segmented, attached to lat- 

 eral-anterior ventral surface of cephalothorax and adjacent frontal 

 region. First segment approximately 1%, times the length of second, 

 narrow proximally and distally, broad medially, distal half of anterior 

 and anterior ventral sm-face with approximately 21 lightly plumose 

 setules. Second segment rodlike, with 12 naked setules distally. Fe- 

 male antenna (fig. 586) 3-segmented, situated posterior and medial to 

 antennule base. First segment socket-like, in'egular ; second segment 

 broader proximally than distally. Thkd segment fused with clawlike 

 terminal process, bearing setule-like accessory process proximally. 

 Male antenna (fig. 58c) with similar fu-st segment, second segment larg- 

 er; third segment indistinctly separable from double-clawed terminal 

 process, with setule-like accessory process at base of proximalmost 

 claw, at jimction of segment and terminal process. 



Female and male mandible (fig. 586) 4-parted, distalmost part flat- 

 tened, with 12 denticulations along inner surface. Female and male 

 postantennal process (fig. 586) consisting of small, lappet-like projection 

 and 3 nodules, 2 at base of projection, third slightly posterior to base, 

 each with several hairlike processes. Female and male postoral proc- 

 ess (fig. 586) elongate, spinelike. Female and male maxillule (fig. 586) 

 nodular, with 3 setules distally. Female and male maxilla (fig. 58c?) 

 2-segmented, situated lateral to postoral process. Both segments elon- 

 gate, second more slender, slightly longer than first, with membranous 

 projection from middle of inner surface and 2 saber-shaped terminal 



