422 



Ivar Tragårdh. 



Lebertia (P.) porosa S. T. 



Fig. 1. Maxillary palps, inner side view. X 295. 

 Fig. 2. Leg I. X 50. Fig. 3. Leg П. x 50. Fig. 4. 

 Leg IV. X 50. Fig. 5. Ambulacre of Leg IV. x 270. 



Distribution: Accord- 

 ing to Thor (6. p. 779) 

 this species in Norway 

 is one of the most 

 common forms in the 

 lakes as well as the 

 rivers. He also records 

 it from the northern and 

 southern Siberia and 

 from Germany, Swit- 

 zerland, Italy, France, 

 England and Scotland. 



This species Johansen 

 (5. p. Ö29) identified 

 with L. fabricii, prob- 

 ably under the appre- 

 hension that only one 

 Hydrachnid occurred 

 in Greenland. 



My determination of 

 it has been verified by 

 Thor. As he has given 

 a detailed description 

 of it with numerous 

 drawings, it is not nec- 

 essary to repeat this 

 here. I therefore give 

 only a few drawings of 

 the organs, the charac- 

 teristics of which are of 

 the greatest value for 

 identifying purpopes. 



Fam. Oribatidæ. 



Subfam. Oribatinæ. 



Oribata Latr. 

 O. notata Thorell. 



Locality: Under loose stones on moist ground, Maroussia 

 19. June 1908; several specimens. 



Distribution: East-Greenland, Cape Stewart (Ryder's and Nath- 

 orst's expedition); Franz Joseph's Archipelago, Cape Flora, North- 



