208 



Description of the male. Body in length 1,2 millim. (anterior 

 part 0,8, posterior part 0,35 millim.). Anterior part 7-jointed. 

 Abdomen 5-jointed ; the anal segment very short, the other of 

 about equal length and breadth. Furca scarcely longer than 

 broad. The longest furcal setae as long as the abdomen. 



Aiiicriot antenna reach slightly beyond the last thoracic 

 segment, 23-jointed or 21-jointed, the Aa 8-10 uniting in 

 younger specimens. 



Posterior antciDUV and tlic mandible as in the female. 



Maxilla. Le i with i shorter and 6 longer plumose sette. 

 Li as prominent as Ri, with about 7 nearly straight hairy 

 coarser set^e and several finer ones. Li 2 with 2 strong and 

 longer seta^, i shorter seta. Li 3 with 1 +4 setae. Re is a slight 

 protuberance with 4 comparatively short setaj. Ri 3-jointed, 

 with 2,2, 4+ I setae. 



First and second tnaxilliped as in the female. 



Natatory legs of the i-4th pair. Re 3-jointed ; Ri of the 

 ist p. i-jointed, of the 2nd 2-jointed, of the 3rd and 4th 

 3-jointed. B i of the ist pair without Si, of the 2nd-4th with a 

 short Si. B 2 of the ist pair with i Si. Ri of the ist and 2nd 

 pair reach to the distal margin of Re 2, beyond it in the 3rd 

 and 4th pairs. Se of Re of the ist pair 1,1,1, more than twice 

 as long as the joints, on the other pairs 1,1 ;3, short and 

 triangular. St of the ist pair bristle-like, of the other pairs 

 straight and knife-like, in the 2nd and 3rd pairs longer, in the 

 4th pair shorter than Re 3 ; their edge rather coarsely serrate 

 (teeth about 4 in 0,01 millim.). Si of the ist pair 0,1,3 ; of the 

 others 1,1,4. Ri of the ist pair with 5 setae. Se of the 2nd 

 pair 0,1, of the 3rd and 4th 0,0,1, but their Ri 2 ends in a 

 small apiculus. Si of the 2nd pair 1,4, of the 3rd and 4th 

 pairs 1,1,4. Small, delicate spinules on the fiat side of the legs 

 occur in the 2nd pair on Ri 2 (a set of 3-4 near the distal and 

 proximal part) and on the distal part of Re 3, in the 3rd pair 

 in the distal part of Ri 3 (a row of 6 small bristles) and on the 

 distal part of Re 3, on the 4th pair in Ri 3 and at the distal 

 margin of Re 2. 



Fifth pair of legs nem-\y ^s long ds the anterior part of the 

 body, the right and left leg of equal length. Bi of both legs of 

 equal length. B2 of the left leg slightly shorter than of the 

 right one, both of about equal breadth throughout. The B2 

 of the right leg carries near its distal end a small tubercle 

 (rudimentary Ri) and in the end a falciform Re, | as long as 

 B2. The B2 of the left leg carries a curved Ri, longer than 

 B2, and a 3-jointed Re, half as long as B2. 



