122 
LePA. 
GENERIC CHARACTER. 
External antenne setaceous, with the two first joints 
largest, the third composed of several minute articulations. 
External double pedipalpes with the second joint of their 
internal footstalk slightly notched at their internal side, 
for the insertion of the palpes. 
Shell anteriorly semielliptic, the sides gradually converg- 
ing towards an angle; hinder part truncate; sides (ge- 
nerally) with nine teeth, the hinder of which is very long. 
Orbit behind with two, below externally with one fissure ; 
internal angle imperfect: eyes thicker than their peduncle. 
Feet various ; anterior pair largest, didactyle ; the se- 
cond, third, and fourth pair simple, with compressed 
elongate nails, which are longitudinally grooved; fifth pair 
compressed, leaf-like, formed for swimming. 
Abdomen with the second and third joints transversely 
carinated and produced on each side: of the male, five- 
jointed (the second, third, and fourth joints often coalesc- 
ing); the middle joint longest, and broader than the fol- 
lowing joints, the Jast of which is very small: of the female, 
composed of seven joints, the last not very abruptly nar- 
rower than the sixth joint. 
