288 The Scottish Naturalist. 



pa lp ata M'Lach. 



Distribution— East, o Forth Tay o Moray Suther- 

 land o o 

 West, o o o o Hebrides. 



ODONTOCBRUM Leach. 

 ALBICORNE Scop. Common. Streams. 



Distribution — East, o Forth Tay Dee Moray Suther 



land o o 

 West. Solway Clyde o o o 



LBPTOCERUS Leach. 



nigro-nervosus Retz. Frequent. Rivers. 

 Distribution — East, o o o o o Sutherland o o 



West, o o Argyle o o 



FULVUS Ramb. Not common. Ponds, lakes, and rivers. 

 Distribution — East, o o Dee Moray Sutherland o o 



West, o Clyde o o o 

 senilis Burm. Not common. Rivers. 

 Distribution — East, oooooooo 



West, o Clyde o o o 



albo-guttattjs Hag. Frequent. Rivers. 

 Distribution — East, o o o o Moray Sutherland o 



West, o o o o o 



annulicornis Steph. Frequent. Rivers. 

 Distribution — East, o Forth Tay o o o o o 



West, o Clyde o o o 



aterrimtjs Steph. Very common. Ponds and lakes. 

 Distribution — East, o Forth Tay Dee Moray Suther- 

 land o o 

 West, o Clyde Argyle o o 



cineretjs Curt. Very common. Ponds, lakes, and rivers. 

 Distribution — East, o Forth Tay Dee Moray Suther- 

 land o Zetland. 

 West, o Clyde Argyle o o 



albifrons L. Common. Rivers. 



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



West, o Clyde o o o 

 COMMUTATUS (Rostock), M'Lach. Common. Rivers. 

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



West. Solway Clyde Argyle o o 



bilineatus L. Common. Streams. 



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



West, o Clyde Argyle o o 



DissiMlLls Steph. Common. Rivers. 



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



West, o Clyde o o o 



