236 



tin- 4 succeeding segments coml>iiit'<l and rather deep, with a transversal depression 

 about in the middle dorsally: rostral projcdion rather broad and terminating in an 

 obtuse point. rp'some ahuut as long as the anterior division, genital segment, 

 like the succeeding one. ^lightly expanded laterally: last segment quadrangular in 

 shape, anal opercle tipped with a somewhat erect spine. Caudal i ami about as 

 long as the anal segment and slightly attenuated distally. without any spinules, 

 hut with a slender seta about in the middle of the outer edge and another close 

 to the tip. Ihe latter carrying a single very strong spinifonn seta not jointed at 

 the ha-e. Anterior antenna' not nearly attaining the length of the cephalic seg- 

 ment and of a very coarse structure, consisting of only 4 articulations, the hist 

 2 joints of the proximal part and all of the terminal part being fused together 

 into single joints. 1st and 2nd joints each produced behind to a claw-like pro- 

 jection, that of the 2nd joint being much the larger. Posterior antenna- likewise 

 rather strongly built, with the 2 apical spines claw-like, outer ramus very small 

 and somewhat lamellar, carrying 4 comparatively short setse. Mandibular palp of 

 insignificant size and rather narrow, with 4 somewhat unequal setse at the end. 

 Posterior maxillipeds of moderate size. 1st pair of legs with the outer ramus 

 only consisting of 2 joints, and scarcely more than half as long as the 1st joint 

 of the inner; the latter exceedingly powerful, with the apical claw strong and 

 slightly curved at the tip. Natatory legs exhibiting the structure characteristic of 

 the genus, proximal joint of inner ramus with a well-developed seta inside Last 

 pair of legs comparatively large. Miaceous, distal joint oblong oval in form, and 

 carrying (i marginal seta' along the outer edge and the tip. 2 of them being very 

 thin and hair-like; inner expansion of proximal joint narrow linguiform and ex- 

 tending to about the middle of the distal joint, its surface exhibiting a peculiar 

 areohited structure, marginal seta' 5 in number, one of them being far remote 

 from the others and attached in front of the middle of the inner edge. Ovisac 

 comparatively small and of rounded form. 



Mali' resembling the female in its general appearance, but easily reeog- 

 nixable by the Wrongly hinged anterior antenna', the 4th joint of which is greatly 

 dilated and produced in front near the base to a hamitorm process. Inner ramus 

 of .'ird pair of legs with a straight posteriorly pointing mueroniform pmcos issuing 

 from the middle joint outside and extending far beyond the last joint. Last pair 

 of legs much smaller than in female, distal joint with only 4 spiniform seta': 

 inner expansion of proximal joint \cr\ Alight, with 2 subeijiial seta-. 



Colour in both -exes a dark brownish gray, with still darker, almost 

 black shadows mme conspicuous on the genital segment. 



Length of adult female about 1 mm. 



