The Scottish Naturalist. 47 



Distribution — East, o Forth Tay o Moray Sutherland o 

 Zetland. 



West. Sohvay Clyde o o Hebrides. 

 OENICULATA M'Lach. Not common. Streams. 

 Distribution — East. 000 Dee 0000 



West, o Clyde 000 



POLYCENTROPUS. 

 flavo-maculatus Pict. Very common. Streams. 

 Distribution — East, o Forth Tay Dee Moray Sutherland o o 



West. Sohvay Clyde Argyle o o 

 MULTIGUTTATUS Curt. Not common Streams. 

 Distribution — East 0000 Moray Sutherland o o 



West, o Clyde Argyle o o 

 kingi M'Lach. Locally common. Streams. 

 Distribution — East. 0000 Moray 000 



West. 00000 



HOLOCBNTROPUS. 

 dubius Ramb. Not common. Ponds. 

 Distribution — East. 0000 Moray 000 

 West, o Clyde Argyle o o 



PICICORNIS Steph. Common. Ponds filled with water-weeds. 

 Distribution — East. 00000000 

 West, o Clyde Argyle o 



CYRNUS. 



TRIMACULATUS Curt. Very abundant. Rivers and lakes. 

 Distribution — East, o Forth Tay Dee Moray Sutherland 



West, o Clyde Argyle o o 

 plavidus M'Lach. Common. Weedy ponds. 

 Distribution— East 000 Dee Moray Sutherland o o 



West, o Clyde Argyle o o 

 The Scottish specimens of this insect vary considerably from the English ones. 



TINODES. 

 WiENERl L. Common. Streams and lakes. 

 Distribution — East, o Forth Tay Dee Moray Sutherland o o 



West. Sohvay Clyde Argyle o Hebrides. 

 AUREOLA Zett. Locally common. About rapids and rock 



springs. 

 Distribution — East, o Forth 000000 



West, o Clyde Argyle o o 



