307 
1906-7.] Hydrachnidae collected by the Lake Survey. 
The colours of the living hydrachnid cannot be stated, as the specimens 
examined had been in formalin for some time. 
12. Genus PIONA, C. L. Koch. 
The genus now under consideration was known at one time as Nescea, 
afterwards as Fiona , and latterly as Curvipes. In “ Hydrachnidae und 
Halacaridse,” Piersig und Lohman, Dr Piersig restored the name Fiona. 
This has not met with general acceptance, and consequently the name 
Curvipes is frequently used. 
Piona obturbans, Pier. — Found at Rannoch, 1902. A nymphal form 
found at Dubh Loch, 1902. 
Piona paucipora, Sig Thor. — Found at Rannoch and Lydoch, 1902. 
Very few specimens found in Scotland. 
Piona fuscata, Herm. — Found at Dubh Loch, 1902. 
Piona rufa, C. L. Koch. — Found at Loch Chlair and Ghriama, 1902. 
Piona carnea, C. L. Koch. — Found at Loch of the Lows (Perth) and 
Loch na Claise. 
Piona aduncopalpis, Pier. — Found at Uanagan, 1903. 
The identification of the twelve genera and eighteen species recorded 
above was made partly by Mr Chas. D. Soar and partly by myself. The 
genus Huitfeldtia has not been recorded before, except for Norway, 
and therefore Huitfeldtia rectipes, Sig Thor, is a new British record. 
Lebertia porosa, Sig Thor, and Oxus ovalis, Mull, are additions to the 
previous lists of Scottish Hydrachnids. 
LITERATURE. 
Piersig und Lohman, “ Hydrachnidse u. Halacaridse,” Das Tierreich , Lief. 13, 
June 1901. 
IS oar, C. D., “A List of Fresh-water Mites found near Oban,” Jour. Quekett 
Micro. Club , ser. 2, vol. vii. No. 47, Nov. 1900. 
Soar, C. D., “Note on the Occurrence of Larval Water -Mites on various 
Aquatic Animals,” Jour. Quekett Micro. Club , ser. 2, vol. viii. No. 48, April 1901. 
Soar, C. D., “Note on the Occurrence of Living Hydrachnid Larvse in the 
Stomach of a Trout,” Jour. Quekett Micro. Club , ser. 2, vol. viii. No. 52, April 1903. 
Soar, C. D., “ On the Life-History of Fresh-water Mites,” Jour. Quekett Micro. 
Club , ser. 2, vol. ix. No. 59, Nov. 1906. 
Thor, Sig, Huitfeldtia rectipes , Sig Thor, Archiv for Mathematik og Natur- 
videnskab , Bd. xx. Nr. 7. 
Thor, Sig, Lebertia Studien , — VI. Zoologischer Anzeiger , Bd. xxix. p. 761. 
Lebertia (Pilolebertia) porosa , Sig Thor. 
Williamson, W., “A Contribution to the Hydrachnid Fauna of Scotland,” 
Trans. Edin. Field Nat. and Micro. Soc., vol. v., pt. iv., 1906. 
(Issued separately October 3, 1907.) 
