154 ANNALS OF SCOTTISH NATURAL HISTORY 



They are written solely with the view of contributing 

 something towards the solution of one of the most complex 

 and obscure problems in the life-history of one of our most 

 familiar food -fishes, and with the conviction that nothing 

 but severe abstinence from predilection, a priori speculation, 

 and opinion based on evidence short of comprehensive, 

 will serve towards elucidating the mystery of salmon- 

 movement. 



SOME RECORDS OF COLLEMBOLA AND THY- 

 SANURA FROM THE "CLYDE" AREA. 



By WILLIAM EVANS, F.R.S.E. 



So little is known from actual observation of the distribu- 

 tion of the Aptera in these islands, that authentic records, 

 however few, from almost any district can scarcely fail to 

 contain some useful items of information hence the present 

 communication. 



During the past two years I have had occasion to 

 visit several localities in the Clyde area in search of 

 spiders ; and while so engaged a good many Aptera 

 have naturally come under my observation also. Two 

 species of Thysanura occurred, and the number of Collem- 

 bola of which specimens have been secured is thirty-two. 

 Most of them are well-known common forms, but several 

 have only quite recently been added to the British list, in 

 which connection I would refer those interested in the 

 subject to a paper by Mr. G. H. Carpenter and myself on 

 ' The Collembola and Thysanura of the Edinburgh District,' 

 which was published in the " Proceedings of the Royal 

 Physical Society" for 1899. Perhaps the most interesting 

 item in the present list is the occurrence of Sminthurus 

 CCECUS in an ants' nest among the Lowther Hills. 



The only person who seems to have previously paid 

 any attention to the Aptera of " Clyde " is Mr. D. A. Boyd, 

 who has recorded, in the " Proceedings of the Natural 

 History Society of Glasgow " (vols ii. and iii. of new series), 

 1 8 or 19 species from the neighbourhood of West Kilbride, 

 Ayrshire. 



