Bd. V: ii) 
THE ACARI. 
25 
Relative length of the joints and the terminal hairs. 
Joints of palpi 
Terminal hairs 
2 1 3 
4 ! 5 
B. antarctica 
37 : 8 : 
7 : 16 
45 : 56 
B. vulgaris v. decipiens . . . 
37 ,s : 5 
As : 13 
37 , 5 : 46 
B. vulgaris 
35 : 6 
6 : 20 
48 : 55 
The present species is closely related to B. vulgaris but is easily distinguished 
from that species by the shape of the mandibles, the situation of the mandibular 
hairs, the fusion of the 2nd and 3rd joint of the palpi and the number of rostral 
hairs. 
Locality: N:o 17. Several specimens. 
il. Erythræus antarcticus nov. spec. 
(Text-figs. 4S, 52.) 
Average length i, 3 mm; breadth o, 75 mm. 
Colour , crimson red (according to the notes made on the specimens when alive 
by Prof. J. G. ANDERSSON). 
Fig. 48. Left mandible seen from the outer side. 230 x . Fig. 49. Crista metopica. H2X. Fig. 50. Pseudo- 
capitulum and coxæ I, II, ventral view. 56 x. Fig. 51. Coxæ III and IV and leg III. 56 x. 
Fig. 52. Leg IV. 56 x . 
The present species seems to be closely related to E. medio areolatus Kram. 
[5, p. 10 — ii, figs. 13 — 15] described from Tierra del Fuego. It differs from it in 
the following respects: 
I038 / 07. Schwedische Südpolar-Expedition igo2 — igoj. 
4 
