20I 



Description of the female. — Body, anterior pari 2,5 millim. in 

 length, I millim. in breadth, posterior part 0,75. The last 

 thoracic segment with rounded ends. Abdomen symmetrical. 

 Genital segment symmetrical as long as broad and longer than 

 the second and third together. Furcal branches somewhat 

 longer than broad. Se and the four terminal setae of equal 

 length, three times longer than the Si. 



Anterior allien iicB do not reRch to the end of the furca, 24- 

 jointed, its proximal part 7-jointed. Length of the joints in 

 0,01 millim. 



Aa ... 2 3 4 5 6 7 8 9 10 II 12 13 14 15 16 

 o, 01 m.m. 27 9 9 9 9 9 6 8 7 8 11 12 17 19 18 



17 18 19 20 21 22 23 24-5 



17 17 14 14 10 7 II 18 



Posterior antenna. Ri li times longer than Re + Bi, three 

 times longer than bioad. 



Mandible as in the other species, the masticatory apparatus 

 M-ith one strong exterior tooth, by a gap separate from two 

 smaller ones. 



Maxilla. Li 2 reaches only slightly beyond the Ri, which 

 carries 1 + 2 + 2 S. Re with 6 longer plumose setae. 



Anteiior niaxilliped. Bi li times longer than B2. Li with 

 3S. L3 and 4 each with 2S, one strong and one small. B2 

 with 2 falciform strong spines of about equal length and 

 breadth inserted at some distance from each other. The falci- 

 form spine of Ri only slightly longer than those of B2. 



Natatory legs. Bi of the ist pair with a short Si, B2 with a 

 Si as long as the Ri ; distal part of Re 3 twice as long as the 

 proximal. Re 3 of the third pair i^ times longer than Re i +2, 

 its distal part half as long as the joint, its edge coarsely denticu- 

 lated proximally, but finely serrate distally. Terminal seta 

 falciform, not half as long as the distal part of the joint. Fourth 

 pair, as usually, without Si. 



Fifth pair of legs. Bi + B2 as long as Ri. The latter with a 

 tooth in the middle of the exterior edge and 3 teeth at the end, 

 the distal one the longest. There are no Si. 



Euchaeta affinis, C:e, n.sp. 



The only female of this species, which belongs to the group 

 of E. norvegica, measured in length 6,3 millim. (anterior part 

 4,5, posterior part 1,8 millim.). The frontal organs occurred 

 on a moderate elevation not protracted into a conical pro- 

 jection. The corners of the last thoracic segment carried a 

 tuft of hairs, but were not provided with an apiculus. The 

 abdomen was naked, and its first segment carried in the 

 middle the strongly projecting genital opening, enclosed 



