Bd. V: II) 



THE ACARI. 



27 



13. Oribata antarctica MiCH. var. major nov. var. (Text-fig. 53.) 



Average length 0,37 mm; breadth 0,54 mm. 



General shape as in O. antarctica. The lamella; 

 comparatively shorter, with comp, longer cusps, con- 

 verging more closeh' 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 cephalothora.x. 



Locality: No. 15. 2 females with eggs. 



^'g- 53- Ceplialothorax of Oribata 

 antarctica Mich. var. major. lOO x . 



14. Oribata affinis nov. spec. 

 (I'l. Ill, fig. 10.) 



Length o,t. mm. Breadth 0,36 mm. 



Colour, redbrown. Texture, polished. 



Rostrum terminating in a small, rounded point. Lamella; rather large blades 

 on edge, of uniform width, e.xcept for the pro.ximal 'A, where they gradually 

 narrow; cusps short, not so broad as in O. 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- 

 morpha;. The pseudostigmata are concealed beneath the pteromorphse. 



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 pteromorphas 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. 



