INSECTA SCOTICA. 



AN ESSAY TO CATALOGUE THE INSECTS INHABITING 

 SCOTLAND. 



INTRODUCTION. 



TN publishing lists of the Scottish Insects, it will be advisable 

 A to indicate, so far as is practicable, the distribution of each 

 species throughout the country. For this purpose Scotland has 

 been divided into thirteen districts. (Plate III.)' In selecting 

 these, an attempt has been made to obtain natural divisions 

 (such as those afforded by the basins of the larger rivers), instead 

 of the arbitrary sections heretofore used for similar purposes. 



The districts are as follows : — 



Eastern Districts. 

 i. Tweed. — The part drained by the Tweed and other rivers 

 entering the sea between Berwick and Cockburnspath. 



2. Forth. — The part drained by the Forth and other rivers 

 between Cockburnspath and Fifeness. 



3. Tay. — The part drained by the Tay and other rivers be- 



tween Fifeness and Cratown. 



4. Dee. — The part drained by the Dee and other rivers be- 

 tween Cratown and Pitsligo. 



5. Moray. — The part drained by rivers between Pitsligo and 



Ord of Caithness, and by the Caledonian Canal as far 

 west as Loch Oich. 



6. Sutherland. — The part drained by rivers between Ord of 



Caithness and Cape Wrath. 



7. Orkney. 



8. Zetland. 



Western Districts. 

 1. Solway. — The part drained by rivers between the Liddel 

 and Culzean Castle. 



