ISOPODA OF THE FAMILY IDOTEID^ 331 



endeavour to exterminate the colony with materials at hand, 

 I poured a few drops of strong "washing ammonia into the 

 entrance of the tunnel after dark, immediately blocking the 

 opening with a pad of cloth saturated with ammonia. In 

 the morning the wasps /lad opened a new exit and were at 

 work as usual. (No casualties were apparent.) Subsequent 

 excavation showed that the first entrance to the subterranean 

 tunnel leading to the nest was distant some 15 ins. from 

 the nest itself, whereas the second entrance, opened under 

 sudden emergency, was made at the place where the earth- 

 covering was thinnest — immediately above the nest itself. 



ON THE ISOPODA OF THE FAMILY IDOTEID/^E 

 OCCURRING IN ST ANDREWS BAY. 



By Walter E. Collinge, M.Sc, F.L.S., etc., Research Fellow of the 

 University of St Andrews, the Gatty Marine Laboratory, St Andrews. 



Ix December 1904 my friend the Rev. Canon A. M. 

 Norman 1 published a very useful and interesting summary 

 of certain families of British Isopoda, amongst which was 

 included the Idoteidae. Of the genus Idoiea, Fabricius, he 

 recorded eight species, one of Zenobiana, Stebbing, and one 

 of Stcnosoiiia, Leach. 



Of these only two were then known to occur in St 

 Andrews Bay, and had been recorded by Professor MTntosh.- 



Recent investigation has shown that in addition to a 

 species new to science, seven of the eight British species of 

 Idotea are found in this bay. No species of Zenobiana^ 

 Stebbing, or Stenosoiiia, Leach, has been met with ; both 

 would seem to be rare in northern waters, although Bate and 



' An>i. and Mag. Nat Hisf., 1904 (s. 7), vol. xiv., pp. 430-448, pis. 

 xii-xiii. 



2 Marine Inverts, and Fishes of Si Andrews, 1875, p. 151. 



