8 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 122 



River on Rte. 22, Louisa Co., Va. ; (8) Lyells, Rte. 202, Northumber- 

 land Co., Va.; (9) Seaview, Northampton Co., Va.; (10) "1 mile 

 above D.C.," Fairfax Co., Va. (11) Howard University Reservoir, 

 Washington, D.C.; (12) tributary to east branch of the Potomac, 

 Burville, D.C.; (13) Plummer's Island, Potomac River, Montgomery 

 Co., Md.; (14) Laurel, Prince Georges Co., Md.; (15) 7 mi. west of 

 Bridgeton, Cumberland Co., N.J. 



Hosts. — Cambarus diogenes diogenes Girard was the host, or one of 

 the hosts, in all of the locaUties cited, and in the type-locality D. jeanae 

 was also found on Procambarus acuUis aciitus (Girard). 



OsTRACOD Associates. — In the type-locality and in localities 2, 3, 

 4, 6, and 8, listed above, D. jeanae was associated with Ornithocythere 

 waltonae and in locality 2 with Okriocythere cheia Hart (1964, p. 243). 

 At locality 13 it was found with Ankylocythere tridentata Hart (1964, 

 p. 245). 



Relationships. — Without a doubt, Dactylocythere jeanae has its 

 closest affinities with D. suteri (Crawford, 1959, p. 162). Their 

 penifera are distinctly similar and the tapering, L-shaped clasping 

 apparatus without a thickening at the junction of the two rami is 

 found in only two other species of the genus, D. chelomata (Crawford, 

 1961, p. 242) and D. striophylax (Crawford, 1959, p. 157). The 

 structure of the penifera of the latter two, however, suggests that 

 D. jeanae is not nearly so closely related to them as to D. suteri. 

 The combination of an angular hump on the posterior side of the 

 vertical ramus of the clasping apparatus, two teeth on the internal 

 border of the horizontal ramus, a bifid finger guard, and a rounded 

 anteroventral portion of the peniferum is unique in D. jeanae. 



Name.^ — This species is named in honor of its discoverer and a 

 member of my academic family, Dr. Jean E. Pugh, who through her 

 contribution of many crayfishes and ostracods to the national collec- 

 tion has added much to om* knowledge of both groups. 



Dactylocythere phoxa, new species 



IMaie. — Eye present. Shell (fig. \e) highest posterior to mid- 

 length, dorsal margin tapering ventrally much more suddenly 

 posteriorly than anteriorly; ventral margin of shell with only a 

 slight concavity just anterior to midlength; submarginal setae evenly 

 spaced except dorsally where absent; length 0.46 mm, height 0.26 mm. 



Copiilatory complex (fig. Id) : Peniferum with ventrally and slightly 

 anteriorly directed subacute apex; apical portion of peniferal groove 

 (pg) directed more strongly ventrally than that in other members of 

 the genus, width of groove at apex about }8 ot maximum anterior- 

 posterior diameter of vertical ramus of clasping apparatus; accessory 

 groove extending posterodorsally to level of dorsal extremity of sper- 



