Bd. V: ii) 
THE ACARI. 
27 
13. Oribata antarctica MICH. var. major nov. var. (Text-fig. 53.) 
Average length o,s 7 mm; breadth o, S4 mm. 
General shape as in O. antarctica. The lamellæ 
comparatively shorter, with comp, longer cusps, con- 
verging more closely at the anterior end and with 
higher translamella. Cusps with slight incision where 
the lamellar hairs are inserted. 
Céphalothorax at the anterior end nearly square, 
with two small lateral teeth. 
Tectopedia I with cusps extending forwards as far 
as the céphalothorax. 
Locality: No. 15. 2 females with eggs. 
53. 
Fig. 53 - Céphalothorax of Oribata 
antarctica Mich. var. major, ioo x . 
14. Oribata affinis nov. spec. 
(Pi. Ill, fig. 10.) 
Length 0,6 mm. Breadth 0,36 mm. 
Colour , redbrown. Texture , polished. 
Rostrum terminating in a small, rounded point. Lamellæ rather large blades 
on edge, of uniform width, except for the proximal 1 / 4 , where they gradually 
narrow; cusps short, not so broad as in 0 . piriformis , anteriorly squared, not 
truncated. Lamellar hairs straight and short, hairy, inserted in the top of the cusps, 
extending forward scarcely beyond the tip of the rostrum. Dorsal edge of cusps 
straight, ventral slightly concave. Translamella a narrow blade on edge, of even 
width throughout. 
Pseudostigmatic organs. I have not been able to see the pseudostigmatic organs, 
either because they were broken off or because they were concealed by the ptero- 
morphæ. The pseudostigmata are concealed beneath the pteromorphæ. 
Interlamellar hairs long, flexible, inserted widely apart. 
First tectopedia not so large as in 0. piriformis and not projecting in long 
points; second tectopedia wide and rounded. 
Abdomen pyriform. Anterior margin of pteromorphæ slightly concave. Two 
rows of small hairs on the notogaster and three pairs round the hind margin. 
Genital aperture nearly pentagonal, anteriorly rounded, posteriorly square. Anal 
aperture oval, nearly contiguous to hind margin. 
Legs. Genua I and II and tibia I — IV with one long tactile hair each. 
Claws tridactyle, nearly homodactyle. 
Locality: No. 12. One specimen. 
