25. With a line of about ten eye spots along the margin of the posterior sucker 



Pisciola milneri (Verrill) 

 Not so 



Pisciola punctata (Verrill) 



26. With about three small rings to each segment (larger division of body) 



near the middle of the body 



Piscicolaria reducta Meyer 

 With twelve to fourteen small rings to each body segment near the middle 

 of the body 27. 



27. Body divided into a narrow anterior and a wider posterior region 



Illinobdella moorei Meyer 

 Sides of body more evenly parallel 28. 



28. With twelve small rings to each body segment 



Illinobdella elongata Meyer 

 With fourteen small rings to each body segment 29. 



29. Body extremely slender, being ten times as long as wide, when extended 



Illinobdella richardsoni Meyer 

 Body less than ten times as long as wide, when extended 

 Illinobdella alba Meyer 



30. With four pairs of simple eyes; color transparent greenish, with yellow 



spots; parasitic on fish and frogs 



Protoclepsis occidentalis (Verrill) 

 (Hemiclepsis occidentalis (Verrill) ) 

 With a pair of compound, adjacent eyes or with one to three pairs 

 of simple eyes; color various 31. 



31. Some of the body rings noticeably wider than others; fish parasites 



Actinobdella annectens Moore 

 Body practically evenly ringed 32. 



32. With one pair of compound, adjacent eyes, with or without pairs of 



tiny, simple eyes posterior to these; temporary parasites on turtles, 

 frogs, fish, etc. 



PlacobdeUa Blanchard (Four common species given) 33. 



With one to three pairs of simple eyes; on plants, stones, etc. 



Glossiphonia Johnston Brook Leeches (Five common species) 36. 



33. With tiny pairs of simple eyes behind the compound eyes; back greenish, 



mottled with brown, yellow and white; head almost colorless 

 Placobdella hollensis (Whitman) 

 With only a pair of compound, adjacent eyes; color various 34. 



34. First few segments widened to form a head'like region; back greenish, 



with lengthwise stripes 



Placobdella montifera Moore 

 No widened head region; striped or blotched 35. 



35. With minute, smooth skin papillae; usually greenish, with yellow stripes 



or spots 



Placobdella parasitica (Say) Common Turtle Leech 

 With sharp skin papillae, usually arranged in lengthwise rows; back 

 blotched green or yellow 



Placobdella rugosa (Verrill) 



88 



