276 GEOL. AND NAT. HIST. SURVEY OF MINNESOTA. 



OENUS CHYDORUS Leach. 

 Chydorus spbsericus Miiller. 



Chydorus sphaericus — C. L. Herrick, Final Report Minn. Crust., p. 116; PI. F, 



Figs. 4, 7, 8, 10. 



Length 0.36 mm. to 0.42 mm.; height 0.31 mm. to 0.36 mm. Habi- 

 tat: Ohio, Kentucky, West Virginia, Georgia. This species is very- 

 abundant. At Atlanta, Georgia, it can be found any time during 

 the year. 



FAMILY POLTPHEMIDJ:. 



GENUS POLYPHEMUS De Geer. 



Polyphemus pediculus De Geer. 



Polyphemus pediculus — C. L. Herrick, Final Report on Minn. Crust., p. 121; PI. B^, 



Figs. 4-6. 



Habitat: Baxley, Georgia. 



