NO. 3668 PTERODRILUS—HOLT 7 
Eagle Creek (Holt Spring Branch) about 4.5 miles north of Living- 
ston, Overton County, Tenn., by Perry C. and Virgie F. Holt, 
July 24, 1961; five paratypes, PCH 1393, from Cambarus tenebrosus 
and Orconectes placidus (Hagen) taken in Little Eagle Creek about 0.5 
miles above confluence with Eagle Creek and about 6.0 miles north 
of Livingston, Overton County, Tenn., by Perry C. and Virgie F. Holt, 
July 24, 1961. 
Diaenosis.—Without dorsal projections, dorsal ridge present on 
segment VIII; bursa pyriform, small, extending at most to ventral 
border of gut; ejaculatory duct of medium length; prostate sub- 
equal to or shorter than spermiducal gland, diameter about % that of 
latter, differentiated; spermatheca with long ectal duct, median bulb 
and ental process. 
Ficure 7.—Pterodrilus choritonamus: a, lateral view of reproductive systems; J, lateral 
view of jaws; c, holotype. 
