Proceedings of 

 the United States 

 National Museum 



SMITHSONIAN INSTITUTION • WASHINGTON, D.C. 



Volume 122 1967 Number 3587 



A NEW GENUS AND THREE NEW SPECIES OF OSTRACODS 



WITH A KEY TO GENUS DACTYLOCYTHERE 



(OSTRACODA: ENTOCYTHERIDAE) 



By HoRTON H. HoBBS, Jr. 



Senior Scientist, Department of Invertebrate Zoology 



The two genera treated here appear to be restricted to the eastern 

 part of the United States. The new genus Ornithocythere is represented 

 by a smgle species that ranges from the Dismal Swamp, Vu-ginia, 

 northward to the vicinity of Baltimore, Maryland, and, insofar as 

 is known, is found only on burrowmg crayfishes. The much more 

 widely distributed Dactylocythere ranges from New Jersey and Ken- 

 tucky southward to Alabama, where most of the species are knoAvn 

 from the mountains, Cumberland Plateau, and the piedmont area. 

 The range of the genus is perhaps more extensive than present records 

 indicate, for one of the species described here is the fu-st to be recorded 

 from the lower coastal plain; its range extends from North Carolina to 

 New Jersey. This ostracod, like the one mentioned above is known 

 only from burrowing crayfishes. The thu'd species, also a member of 

 the genus Dactylocythere, is presently known from a single locality 

 in the Greenbrier drainage system in West Virginia, where it was 

 found on perhaps the commonest crayfish in the Appalachian Moun- 

 tains, Cambarus b. bartonii (Fabricius). 



Because no key exists to aid in the identification of the species of 

 the genus Dactylocythere, an artificial one is presented as an introduc- 

 tion to the two members described here. 



