OE SPECIES. 



247 



In other Parts of the Globe. 



Siberia. Thibet. Afghan- 

 istan 



Siberia. North Africa . 



Siberia. Cashmere . . 

 Siberia. North Africa. Af- 

 ghanistan 



Asia Minor. North Africa 



United States 

 Arctic Siberia 



Siberia. 

 Syria . 



North Africa 



United States 



Siberia . 

 Siberia. 

 Siberia , 

 Siberia. 

 Siberia 



North Africa 

 North Africa 



Siberia. North Africa 

 North Africa .... 



Siberia 



North Africa. Madeira 



Siberia. North Africa 

 Siberia. North Africa 

 North Africa .... 

 North Africa .... 

 Siberia 



Habits. 



North Africa. Canaries 

 Canaries 



In ponds, lakes, ditches, springs, at various elevations. 

 In shallow muddy waters. 



In slow streams, canals, ponds, marshes. 



On the muddy margins of stagnant and slow waters. 

 On the gravelly bottom of rivers,. in warm springs, etc. 



In canals, ponds, and gently running waters. 



In canals, ponds, and gently running waters. 



In ponds and ditches, on blades of grass and other 



plants. 

 On aquatic plants, both in stagnant and running water. 

 In gently flowing streams and lakes. 

 In ponds and gently flowing streams. 

 In ponds and ditches. 

 In shallow ponds, drains, and swamps. 

 In ditches, drains, and other stagnant water. 

 In ditches, drains, and other stagnant water. 

 In ponds, ditches, swamps, or among wet grass. 

 Everywhere common on water plants. 

 In stagnant marshes, ponds, ditches, etc. 

 Everywhere in marshes, ponds, canals, ditches, etc. 

 In ponds, ditches, stagnant marshes, etc. 



In muddy ponds and ditches. 



On water flags in ponds and ditches. 



On water plants in ponds and clear streams. 



On water plants in ponds, lakes, and marshes. _ 



On duckweed and other plants in ponds and ditches. 



On plants in shallow stagnant water. 



On plants in shallow stagnant water. 



Under stones, and among dead leaves and moss. 



Under stones and among dead leaves and moss. 



Under stones and among dead leaves and moss. 



Under stones, among rocks, trees, moss, chiefly in chalk- 

 districts. 

 On mud and water flags in wet places. 

 On plants in sandy places near the sea. 

 On mud and flags in wet places. 



In gardens, burrowing deep into the ground. 



In gardens, burrowing deep into the ground. 

 In rapids and mountain streams. 



