420 Ivar Trägärdh. 



are no other, large species of the genus in the same locahty, seems 

 to indicate that B. littoralis in places where there are no fellow-com- 

 petitors may extend its hunting-ground inland. 



Subfam. Trombidiiuæ. 

 Podothrombium Berl. 



P. bicolor (Herm.) var. curtipalpe Sig. Thor. 



Locality: Stormkap, 22th June 1907, under a "knogel"? in a 

 dry sandy place. 



Distribution: West-Greenland, "between Sukkertoppen and Kan- 

 germiut", 5th June 1885 (S.Hansen); Holstenburg, 13.— 16. June and 

 8th July 1895 (W. Lundbeck); Karsiliak near Navertalik, 22th May 

 1885 (T. Eberlein) ; Ritenbenk, 27th August (W. Lundbeck); Iceland, 

 Hekla-Harbour, April 1892 (Deichmann); Siberia, Arctic Lappland, 

 Norway. 



Notes on the colour: The colour of this var. was not known, 

 all descriptions having been made on specimens preserved in spirit. 

 The following statement regarding it was made by Mr. Johansen: 

 "Earth-mite, body blackish-red, with bright red legs and head" 

 (the expression "head" obviously signifies the céphalothorax). 



Fam. Hydrachnidæ. 



Subfam. Lebertiinæ. 



On Hygrobates fabricii Thorell. 



Thorell (11. p. 150) identified with some doubt the specimen 

 captured by J. Lindahl at Qanersoit with the species recorded by 

 Fabricius (Acarus aquaticus) from Greenland. He also gave a short 

 description of a Hydrachnid larva found in the same locality on 

 Chironomus frigidiis Zett and which he wrongly referred to Trombidium. 



In my paper on the arctic Acari (13. p. 62 — 63). I suggested 

 that this larva was the larva of H. fabricii which I considered as 

 synonymous with Lebertia vigintimaculata S. T. recorded by SiG. 

 Thor from Hammerfest and Senjen in Norway. 



In a subsequent paper (7. p. 272 — 273) Thor expresses his 

 doubts as to the synonymy of these two species , pointing out that 

 Thorell expressly says that his species has no swimming-hairs 

 on the legs. He furthermore repudiates my referring the larva 

 figured by me to L. fabricii Thor. and even denies that it is a 

 Lebertia at all, as it does not agree with the drawing of a larva of 



