ON A COLLECTION OF COPEPODA FROM FLORIDA, 

 WITH A DESCRIPTION OF DIAPTOMUS FLORID ANUS, 

 NEW SPECIES 



By C. DwiGHT Marsh 



Of the United States Department of Agiricidture 



Amonj; collections made by F. J. Myers in Polk County, Fla., in 

 1918 and given me by H. K. Harring were three vials, numbered 1, 

 3, and 4, containing copepods. The following species were repre- 

 sented : 



Diaptomus fiorUfaniis, new species. 

 Cyclops viridis Jurine. 

 Cyclops leuckarti Clans. 

 Cyclops albidus Jurine. 

 Cyclops fuscus Jurine. 

 Cyclops seiTtilatus Fischer. 

 Cyclops phalerutvs Koch. 

 Canthocamptus northumbricus Brady. 



Other than the discover}^ of an hitherto undescribed species of 

 Diapt&mus, which here is given the name foridanuis, no especial im- 

 portance attaches to the occurrence of Canthocamptus northumbricus 

 or the species of Cyclops, with the exception of Cyclops viridis, as 

 they are forms Avhich are practically world-wide in distribution. 



The presence of Cyclops vii'idis, however, is of considerable in- 

 terest. While this species has been reported from many American 

 localities, the evidence of the distribution of the true European 

 viridis in America is very meager, and many of the identifications 

 are very doubtful. 



Chambers ^ states clearly the distinctive characteristics of C. viridis 

 Jurine, C. parous Herrick, and C.americanusliiisivsh. Marsh ^ veri- 

 fying Chambers's findings, not only has reexamined and compared 

 these three species, but also Cyclops hrevispinosus Herrick and 

 Cyclops magnus Marsh, 



No. 2659.— Proceedings U. S. National Museum. Vol. 70. Art. 10. 



18122—20 2 



