KONGL. SV. VET. AKADEMIENS HANDLINGAK. BAND 35. N:0 5. 37 



3-joiiited. På 1 shorter than Ijroad. Ri 2 and 3 of nearly equal length. Se of the 2nd 

 pair O, O, 1, of the other O, O, 2. Si 1, 2, 5. Ri 2 of all pairs aad Ri 3 of the third 

 and fourth p. armed with numerous s])ines. 



Fifth pair of legs not developed. 



Description of the male. Body l,i to 1,2 (anterior part 0,s — 0,9, posterior part 

 0,3 — 0,aö) mm. Dorsal maroiri gently convex, not hunip-backed, 4 jointed. Cö~T7il 

 twice as long as the other joiiits together. Lateral angles of the last segment rounded. 

 Abdomen 5-jointed; longitudinal proportion of the joints 4:6:4:5:4,5. Furca as long 

 as broad and shorter than the anal-segment, its longest 5 shorter than the abdomen. 



Antennce of the first pair. Left and right similar, 18-joirited, the proxiraal joints 

 united irito one division, Vs as long as the distal part. The proxiinal part with 1 strong 

 S and many sensorial appendages. The 7 proximal joints of the distal part of the an- 

 tennas as long as broad, the other 1^'2 to 2 times loiiger than broad; their «S faint. 

 Terminal »S' of the last segment almost rudimentary. 



Antennce of the second pair. B 2 with 2 5/, one longer and one shorter. Re and 

 Ri of equal length. Re 3 — 6 with long pluraose Si; Re 7 with 1 Sp only, which is in- 

 serted at some distance from the end. Ri naked; its Le and Li each with 6 *S; the most 

 exteriör of them with stift' hairs at the proximal part. 



Mandible. B naked. Re and Ri of equal length; Re with 6 S; Ri with 1 short 

 Si and 9 St. Masticatory apparatus not developed. 



Maxilla very reduced; Ri hugger than Re with 2 S; Re with 6 »S; Le \ with 5 (?) S. 



Second manlliped 3-jointed, joints almost equal in length. B 1 naked; B 2 at the 

 distal end with 2 small and 1 longer plumose S. Ri not articulated, with 3 strongly 

 plumose Se, the proximal of which is as large as the maxilliped; Si small, the proximals 

 plumose. 



First pair of natatory legs. B 1 naked and unarmed. B 2 with 1 Si and a row of 

 4 apiculi. Re and Ri unarmed, but the exteriör margin of Re 3 beneath the Se 1 with 

 some stiff hairs. S as in the preceding species. 



Second and fourth pairs of natatory legs. B 1 as long as broad, with slightly 

 convex margins, armed with several sets of spines, with 1 short pluraose Si. B 2 shorter 

 than Bl. Ri half as long as Re (or longer on the 4th p.). Re 3 as long as Re 1 and 

 2 together. Se 1, 1, 2. Se 1 of Re 3 divides the joint in a distal and pi'oximal part of 

 equal length (but on the 4th p. the distal part is ^/a as long as the proximal). St knife- 

 like, shorter than Re 3. Si 1, 1, 5, plumose. Exteriör margins of Re 2 and 4 (even the 

 distal part of Re 3) saw-Iike. Teeth on the distal part of Re 3 of the 4th pair about 10. 



Fifth pair of legs. The left leg only developed, see fig. 16. ■ .:; ; ,!;. i'' 



Calanopia Aurivillii Cl., n. sp. 



(Pl. II, tig. 17—23; Pl. III, fig. 1 — 10). ■ ■ ■ 



., ■■ . i' '■' .' ;-... . ■- ■■.,•;■ ; '.'.v 



Diagnosis. The feinale. Abdomen 2-jointed. The first segment ^/4 as long as the 

 second. Fifth pair of legs symmetrical, 3-jointed; the third joint with 4 5, of which the 

 4th is the longest. L. 1,3 mm. 



