2i6 ANNALS OF SCOTTISH NATURAL HISTORY 



answered as the result of one visit to the island. Only long 

 experience with the various species and with the successive 

 changes, both in the plant formations and in the correspond- 

 ing Water-beetle associations, can satisfactorily settle such a 

 point. Hence the use of such lists of species as I have 

 given lies largely in the future, when a re-examination of 

 the ground will indicate changes in the fauna, which may 

 help to explain the origin of island faunas, and to solve the 

 question whether land-connections are of such importance as 

 some authors have declared. 



BIBLIOGRAPHY 



Of papers relating to Water-beetles in the North Ebudes and 

 also to the capture, etc., of Dytiscus lapponicus in the British 

 Islands. 



1854. Clark, Rev. Hamlet, (i) 'Notes on the Capture of some of the Rarer 



British Hydrocantharida;,' "Zoologist," 

 p. 4532. (The first Britannic record of 

 D. lapponicus. Isle of Mull. ) 



1855. ,, ,, (2) 'Notes on Certain British Hydrocantharidae,' 



ibid. p. 4770. 



,, ,, (3) 'Synonymic List of the British Carnivorous 



Water-Beetles, together with Critical Remarks and Notices of Foreign 

 Allied Species,' ibid. p. 4850. (These two papers merely refer to the 

 1854 record.) 



1860. Somerville, Alex. ' A Glimpse of Mull and its Fauna.' "Zoologist," 

 xviii. pp. 7055-7059. (D. lapponicus in southern part of the island.) 



1868. Somerville, J. E. ' Re-occurrence of D. lapponicus in Mull,' "EMM." iv. 



1869. ,, ,, ' D. lapponicus in Ireland,' ibid. v. 141. 



1870. White, F. Buchanan. 'Notes on the Habits of D. lapponicus, Gyll.,' 



"Scot. Naturalist," vi. (He mentions that 

 Somerville also took the species " in an island 

 near Mull." 



1871. ,, ,, ' Notes on the Insects of Strathglass, Inverness- 

 shire,' "EMM." vii. 45-53- 



1871-8. Sharp, D. 'The Coleoptera of Scotland,' "Scott. Naturalist," vols. 



i.-iv. (Records of D. lapponicus for "Moray, Clyde, and Argyll" 



districts. Unfortunately the Clyde record cannot now be traced.) 

 1876. Forbes, W. A. ' Notes on the Entomology of Skye,' "Scott. Naturalist," 



iii. 

 1895. Grimshaw, P. H. 'On some Coleoptera from the Island of Rum." 



(Collected by Mr. Symington Grieve in July 1884.) "Ann. Scott. 



Nat. Hist." iv. 128. 



1897. King, J. J- F. X. 'D. lapponicus in the Island of Mull,' "EMM." ser. 



2. viii. 



1898. Thornley, Rev. A. 'Additional Coleoptera from the Summit of Ben 



Nevis.' (Collected by Mr. W. S. Bruce in May 1896.) "Ann. Scott. 

 Nat. Hist." vii. 30. [D. lapponicus in tarn about 2500 feet.] 

 1903. Beare, T. Hudson. ' D. lapponicus in Tobermory district, Mull, MS. 

 Note of Captures in August 1903 kindly sent me. 



