286 Tlie Scottish Naturalist. 



MICROPTERNA Stein. 



sequax M'Lach. Frequent. Streams. 



Distribution — East. o Forth Tay o Moray Suther 



land o o 

 West. Solway Clyde o o o 

 ateralis Steph. Common. Streams. 

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



West, o Clyde Argyle o o 



HALBSUS Steph. 



radiatus Curt. Very common. Streams. 

 Distribution — East. o Forth Tay o Moray Suther 



land o o 

 West, o Clyde o o o 



All the species of Halesus are autumnal. 



digitatus Schrank. Frequent. Streams. 

 Distribution — East, oooooooo 



West, o Clyde o o 



AURICOLLIS Pict. Common. Streams. 



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



West, o Clyde o o o 



DRUSUS Steph. 



annulatus Steph. Common. Streams. 



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



West, o Clyde o o o 



ECCLISOPTERYX Kol. 



GUTTULATA Pict. Common. Streams. 



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



West, o Clyde Argyle o o 



CH^ETOPTERYX Steph. 



VILLOSA F. Common. Streams. 



Distribution — East, o Forth o Dee o o o o 



West, o Clyde o o o 



APATANIA Kol. 



WALLENGRENI M'Lach. 



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



West, o Clyde o o o 



SERICOSTOMATIOffi. 



SERICOSTOMA Latr. 

 P3RSONATUM Spence. Common. Streams. 

 Distribution —East. Tweed o Tay Dee Moray Suther- 

 land o o 

 West, o Clyde o o o 



GOERA Leach. 

 PILOSA F- Common. Slowly-running streams. 



