24 IVAR TRÄGARDII, (Schwed. Südpolar-Exp. 



lo. Bdella antarctica nov. spec. 



(PI. n. figs 9, 12 & 21.) 



Average length o,8ü mm. Average breadht o,3(. mm. Length af rostrum 0,30 nmi. 



General shape like that oî B. vulgaris (Herm.) K. Céphalothorax well demarcated 

 from the abdomen, 0,3 mm. long, with 3 pairs of long hairs inserted in deep pores; 

 one pair is situated not far from the anterior margin, the two others of which the 

 ateral one is the longest, are situated on a level with the posterior pair of e\-es. 



On the dorsal side of the abdomen are 4 rows of hairs and at the hind margin 

 4 pairs. 



Ventral side. Co.xse I nearl_\- contiguous in the middle, with 5 pairs of hairs, of 

 which 3 near the antero-lateral margin and 2 near the postero-lateral angle; coxa; II 

 with 6 pairs, coxae III with 8 and coxje IV with 3 pairs of hairs. 



Genital aperture oval, long, with 10 pairs of hairs. 



The legs. Trochanter I and 11 at the antero-lateral angle with a straight hair, 

 somewhat longer than the others. Femur not very distinctly demarcated from telo- 

 femur, especially in legs I and II. One long sense hair at the top of tibia I and IV 

 and at the base of tarsus III and IV. Length of legs (excl. coxa and trochanter); 

 I 0,4s mm, II 0,42 mm, III 0.32 mm. IV 0,62 mm. 



The mandibles ver}- narrow, 0,04s mm by a length of o.^qd mm, the greatest 

 width close to the base, from thence gradually narrowing with straight edges. Chela 

 very short, edentate (PI. II, fig. 9). Near to the chela on the exterior side a small 

 pore. Two hairs on the exterior side of the mandibles, situated much more forward 

 than in B. decipiens [12, PI. II. fig. 3]; the posterior hair is situated very near to 

 the middle and the anterior one half way between the posterior one and the tip 

 (PI. II. fig. 21). 



The palpi short, not exceeding the length of the rostrum; the third joint partly- 

 fused with the second one; on the exterior side is to be seen no trace of the fusion 

 but on the interior side there is an oblicjue fold. The second (2 + 3) joint on the 

 ventral side, near to the base, with two rather long, perpendicular, slightly curved 

 hairs; on the exterior side, in the pro.ximal half, three hairs; on the dorsal side, in 

 the distal half, two hairs, and on the interior side in the middle, three hairs. Third 

 joint, narrow, cylindrical, with two dorsal, one exterior, and one interior hair. 



Terminal joint triangular, with scjuared end, half as broad as long; two long 

 terminal hairs inserted in large cup-shaped pores; on the dorsal side near the end 

 one long hair, on the external side one, and on the internal side two small hairs. 

 Rostrum with only 2 pairs of hairs. 



