﻿170 PROCEEDINGS OF THE NATIONAL MUSEUM vol. lOo 



Male: Anterior body region smaller and slimmer than female, 

 carapace and length of thorax equal ; fourth and fifth segments dis- 

 tinct, winglike expansion on fifth segment similar in shape and armor 

 to that of the female ; abdomen long and slender, with five segments 

 very slightly asymmetrical, the right side being a little longer than 

 the left; genital segment (first one) thicker than the others, carrying 

 a spine on right side and an irregular indentation on the caudal end 

 of the left (21, g) ; second to fourth segments similar, decreasing in 

 size caudally from second to fourth, caudal segment smallest ; f ureal 

 ramus more than twice as long as wide, i. e., relatively narrower than 

 in the female, mesial side provided with fine hairs, furcal setae 

 plumose, not quite so long as abdomen. Total length, exclusive of 

 caudal setae, 0.9 to 1 mm. 



Right first antenna with spines on joints 10, 11, 13, and 15 ; four- 

 teenth joint without spine, spine on thirteenth joint large, longer than 

 thirteenth and fourteenth joints together, with its tip dilated and 

 notched, spine on fifteenth joint least, antepenultimate joint without 

 hook or claw, only a thin hyaline membrane on the outer surface of 

 distal section, last joint at distal end unmodified. 



Fifth leg asymmetrical, proximal joint of left protopodite larger 

 than distal one, armed with a stout hyaline spine on outer caudal sur- 

 face (fig. 21, h) and a small hyaline process on mesial part ; distal joint 

 of protopodite provided with the usual sensory hair on outer surface ; 

 endopodite consisting of a single joint, cylindrical, with a slight in- 

 dentation of its mesial side, without spine, but covered distally with 

 hairs ; exopodite apparently in two joints, proximal joint cylindrical 

 with a slight elevation facing the endopodite on the inner side covered 

 with hairs; distal joint conical, half as long as proximal, mesial corner 

 of proximal portion covered with hairs, which become more abundant 

 toward the distal end, apex of cone drawn out into two processes that 

 form at the end a minute pincer covered with hairs. Right leg much 

 larger, basal joint of protopodite larger than the next one, carrying a 

 stout spine larger than the corresponding spine on the left leg, second 

 joint of protopodite thicker than that on the left side, provided with 

 one sensory hair ; endopodite a single piece, acuminate, with a slight 

 indentation, about as long as basal joint of exopodite, tip covered with 

 hairs; exopodite with two joints, basal one half as long as distal, with 

 a large hyaline process on inner surface facing endopodite, process 

 rectangular in shape, occupying more than half the length of the basal 

 joint; distal joint large, curved, with concave surface facing the 

 median line, lateral spine arising from near the middle of the convex 

 surface, one-third as long as terminal claw, which is articulated with 

 the distal end of the second joint, claw large, sickle-shaped; second 

 joint without any other process or appendage besides these two ; total 



