Species and Varieties Known to Exist in Wisconsin. 283 



Several species were not found north of central Wisconsin: 



Scapholeberis aurita, Fisch. 



Pleuroxus exiguus, Lillj. 



Dunhevedia setiger, Birge. 



Alona quadrangularis, O. F. M. 

 Without doubt the range of many of these will be extended by 

 further study. A. striking example occurred just as this paper 

 was going to press. Macrothrix rosea, Jur. was not found in 

 northern Wisconsin, although abundant in the centre of the 

 state and although it was especially sought. Finally a single 

 specimen was found in a pelagic collection from Bayfield at the 

 extreme north of the state, 



A considerable number of species have been found in southern 

 Wisconsin, whose range has not as yet been extended to the 

 northern part of the state. These are : 



Moina affinis, Birge. 



Moina flageilata, Hudendorff . 



Ceriodaphnia megalops, Sars. 



Scapholeberis obtusa, Schdl. 



Daphnia pidex, De Geer. 



Daphnia microcephala, Sars. 



Daphnia longiremis, Sars. 



Ilyocryptus sordidus, Liev. 



Bosmina longicornis, Schdl. 



Bosmina bohemica, Hellich. 



Leydigia quadrangularis, Leyd. 



Alona tenuicaudis, Sars. 



Alonopsis latissima, var. media, Birge. 



Camptocercus macrurus, O. F. M. 



Camptocercus biserratus, Schdl. 



Adding these to the former list we have a total of eighty- 

 four species and varieties known to exist in Wisconsin. Of 

 these varieties it may be said that nearly all of them are recog- 

 nized as species in standard lists of European Cladocera and in 

 comparing the fauna of Wisconsin with that of any other country, 

 most of them must be counted as species. 



