62 PROCEEDINGS OF THE NATIONAL MUSEUM vol. us 



long spikelike aciculum. Aciculum slightly swollen proximally, ex- 

 tending posteriorly to anterior region of genital segment, terminat- 

 ing in irregularly bifurcate tip (fig. 2c); inner ramus rounded, outer 

 pointed. Median cephalothoracic region extending posteriorly 

 slightly past lobate extensions of lateral regions. Dorsal median 

 cephalothoracic region with Y-shaped area of heavy sclerotization, 

 arms of Y-angled outward sharply, turning anteriorly and extending 

 to sharply curved lateral anterior cephalothoracic margin then turn- 

 ing medially sharply and extending to median longitudinal axis of 

 body although ramifying to some extent. Ocular elements not 

 visible. 



Second, third, and fourth pedigerous segment (fig. 26) free. Second 

 segment more than twice as wide as long, narrower anteriorly than 

 posteriorly, w4th flatly convex anterior and lateral margins and flat 

 posterior margin. Dorsal region of segment with slender, irregular 

 area of heavy sclerotization extending across anterior end and poste- 

 riorly along median longitudinal axis of segment. Third pedigerous 

 segment slightly more than twice as wide as long, anterior region 

 broader than posterior, lateral margins straight or flatly convex. 

 Area of heavy sclerotization present and similar to that of second 

 pedigerous segment. Fourth pedigerous segment slightly wider than 

 long, somewhat less than twice the length of third segment. Poste- 

 rior region slightly broader than anterior, lateral margins straight 

 anteriorly, irregular or flatly convex posteriorly. Area of heavy 

 sclerotization present, similar to that of preceding segment although 

 lateral portions curving posteriorly sharply. 



Genital segment (fig. 2a) elongate, more than twice the combined 

 lengths of cephalothorax and free pedigerous segments. Anterior 

 end slightly wider than posterior, convexly curved, lateral margins 

 slightly irregular, posterior margin wavy, almost scaUoped. Segment 

 with parallel longitudinal striations due to presence of muscle bands 

 extending length of segment. 



Abdomen (fig. 2a) 1-segmented, elongate, approximately three- 

 fourths the combined lengths of cephalothorax and free pedigerous 

 segments. Anterior end shghtly less than twice the width of posterior, 

 margin almost flat, lateral margins smoothly irregular. Slight but 

 distinct indentation in posterior third of segment. Posterior margin 

 either rounded or flat, lateral to anal indentation. Caudal rami 

 (fig. Se) elongate, length slightly less than 6 times the width. An- 

 terior end concave mediaUy, rounded laterally, lateral margins 

 smoothly irregular although parallel for most of length. Posterior 

 margin rounded, surface bearing 4 large, hook-shaped setae, inner 

 two hghtly plumose, larger than outer two. Two additional, hair- 



