14 Proceedings of the Royal Irish Academy. 



mentions also its occurrence at Advent Bay and Dickson Bay, which, like 

 Klaas Billen Bay, open into the great lee Fiord of the West Island. 



ENTOMOBEYIDAE. 



ISOTOMINAE. 



Folsomia Willem. 

 Folsomia sexoculata (TuUberg). 

 This springtail was found at a single locality only on the archipelago. 

 Klaas Billen Bay (four specimens among moss and Carex at edge of salt marsh, 

 near Bruce City, 13th August, 1921). It is known to occur in eastern 

 Greenland and on Jan Mayen (Linnaniemi, 1912, p. Ill), as well as in 

 northern Europe (Norway, Finland, Germany, northern England, Scotland, 

 and western Ireland), but it has not previously been recognised as a membei' 

 of the Spitsbergen fauna. 



F. quadrioculata (Tullberg). 

 This species has been known as a member of the Spitsbergen fauna since 

 the publication of Lubbock and Wahlgren's papers (1899). In the present 

 collection it is represented by specimens from Klaas Billen Bay (twenty 

 among moss and Carex at edge of salt marsh, near Bruce City, 13th August, 

 1921, and four in damp moss by boulders on raised beach, Bruce City, 

 4th August, 1921). It has been recorded from the western and eastern coasts 

 of the West Island by Skorikow (1900, p, 206), as well as from King Karl's 

 Islands. Wahlgren (1900&, p. 5) noticed its presence on Bear Island. It has 

 a wide distribution in northern and central Europe (including Great 

 Britain), and extends into Greenland and North America (Linnaniemi, 

 1912, pp. 111-13). 



Archisotoma Linnaniemi. 

 Proisotoma Borner (in part). 

 Archisotoma Beselsi (Packard). 

 Isotoma Beselsi Packard (1877). 

 /. spitzbergenensis Lubbock (1899). 

 /. arctica Stscher (1899). 

 I. janmayensis'WaMgr. (1900a). 

 This well-known and most characteristic Spitsbergen insect is abundant 

 in the collection. Prince Charles Foreland (in large numbers among decay- 

 ing seaweed on shingle shore, inner side of Pdchard Lagoon, 9th July, 1921). 

 Klaas Billen Bay (sixteen specimens on surface of tidal pools near Bruce 

 City, 13th August, 1921 ; twelve specimens at low water-mark. Cape Scott, 

 10th August, 1921). Lubbock's types of /. spitzlergeyisis came from Dixon 

 Bay, which, like Klaas Billen Bay, opens into the great Ice Fiord. 



