152 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 115 



Abdomen of male arising from posterior surface of genital segment; 

 of two distinct segments, first segment short, half length of second; 

 second flared slightly at posterior end (fig. 4c). 



Antennule of female two-segmented, excluding frontal plate, 

 attached to ventral surface of cephalothorax and frontal region just 

 medial to lateral frontal margin of frontal region. Greatest length 

 of first segment one and a half times that of second; greatest width 

 three-fourths greatest length. Anterior margin angular, apex of angle 

 at widest point. First segment with twenty plumose setae on distal 

 two- thirds of anterior margin. Greatest length of second segment 

 more than two and a half times greatest width; proximal portion of 

 segment narrowing abrujitly at junction with first segment. Second 

 segment with one naked seta on middle of posterior margin, twelve 

 naked setae on distal surface (fig. 4/). 



Antennule of male similar to that of female except second segment 

 longer, fu'st segment only slightly longer than second (fig. 4e) . 



Second antenna of female three-segmented, attached slightly 

 posterior and medial to base of antennule. Fu'st segment short, 

 forming articular surface for second segment; sharply pointed, 

 posteriorly directed process projecting from posterior proximal 

 surface of segment. Second segment short, strongly developed; 

 greatest width, at proximal end, slightly less than greatest length, 

 tapered slightly towards distal end. Inner and outer distal corners 

 of second segment projecting slightly, heavily chitinized, serving as 

 articular surfaces for third segment. Third segment with uncinate, 

 acuminate terminal process; length of combined segment and process 

 greater than length of preceding two segments. Third segment with 

 small, spinelike accessory process on posterior proximal surface. 

 Division between terminal process and segment not visible (fig. 4^). 



Second antenna of male three-segmented; first segment as long as 

 second, attached to ventral surface of cephalothorax along entire 

 length. Proximal end of first segment with small, posteriorly directed, 

 pointed projection; anterior end forming concave articular surface 

 for second segment. Second segment strongly developed, with small 

 adhesion pad on inner distal lateral surface; distal surface irregular, 

 with several heavily chitinized regions for articulation with third 

 segment. Third segment with trifid, spinelike terminal process. 

 Third segment short, length including terminal process less than 

 fourth that of second segment, with two setalike accessory processes, 

 one from posterior medial surface of segment, second from anterior 

 medial surface. Division between terminal process and segment 

 distinct (figs. 4h,i). 



Female and male mandible four-parted. First part long, broad 

 proximally, with uneven taper to slightly narrower distal region. 



