ANNELID GENUS CAMBARINCOLA — ^HOFFMAN 309 



normal in having a distinctly broader ental portion of the prostate, 

 as illustrated, but the quality level of this departure, particularly as 

 seen in one specimen, cannot be given much attention at the present. 

 It will, of course, be worthj^ of investigation when additional material 

 is forthcoming from the lower Mississippi drainage. 



Despite the apparent discontinuity involved, the specimens recorded 

 from western Massachusetts do not vary in any way from the typical 

 population of the species in Indiana. 



Distribution. — Records based upon specimens personally ex- 

 amined indicate a rather wide but perfectly coherent range over much 

 of midland United States, from northern Michigan and South Dakota, 

 Indiana, Kentucky, and Oklahoma to the coastal plain of Louisiana 

 and Texas. No material has been examined from many of the 

 States included in this general statement, but there is no doubt that 

 future collections will establish the species in all of them, as well as 

 extend the presently known periphery. 



Material examined. — 25 slides, from the following localities: 



Arkansas: Crittenden county: 14.6 miles south of Marked Tree, on U.S. 

 Hy. 63, July 5, 1958, P. C. Holt (PCH 758). greene county: Roadside ditch 

 along Ark. Hy. 25, 0.8 miles east of the Lawrence County line, July 5, 1958, 

 Holt (PCH 759), MARION county: Fallen Ash Creek at Flippen, July 6, 1958, 

 Holt (PCH 764). 



Indiana: clay county: 1.4 miles south of the Parke-Clay county line on Ind. 

 Hy. 59, July 26, 1958, Holt (PCH 808). perry county: Small gravelly stream, 



1.5 miles east of Adyville, U.S. Hy. 460, July 26, 1958, Holt (PCH 815, para- 

 types), spencer county: Sluggish muddy stream, 5.4 miles south of Chrisney 

 on U.S. Hy. 231, July 27, 1958, Holt (PCH 817). 



Iowa: dubuque county: 9.9 miles north of St. Donatus on Iowa Hys. 28 and 

 67, May 12, 1956, Holt (PCH 896). 



Kansas: chautauqua county: 4.3 miles west of the Montgomery County 

 line, near Niotaze, July 8, 1958, Holt (PCH 773). 



Kentucky: logan county: Small stream at Diamond Spring, 5.7 miles north 

 of Lewisburg on U.S. Hy. 430, July 27, 1958, Holt (PCH 821). mclean county: 



3.6 miles north of Livermore on U.S. Hy. 431, July 27, 1958, Holt (PCH 818). 

 Louisiana: st. mary's parish: Lake Lapoudre at Morgan City, data and 



collector not indicated (USNM 17759). Identified as C. macrodonta by Max 

 M. Ellis. 



Massachusetts: Berkshire county: Housatonic River drainage. Green- 

 water Pond, June 11, 1953, D. W. Crocker (PCH 577); also Lake Mahkeenac, 

 same date and collector (PCH 578). 



Michigan: cheboygan county: Douglas Lake, July 1915, Max M. Ellis 

 (USNM 17668). Labeled as paratype of Cambarincola vitrea by Ellis. 



Oklahoma: comanche county: Cache Creek at White Wolf Crossing, in Fort 

 Sill, June 1, 1959, J. W. Berry (PCH 906). Delaware county: Small gravelly 

 stream, 5.5 miles north of Jay, July 7, 1958, Holt (PCH 770). 



South Dakota: beadle county: 6.6 miles west of the junction of Hys. 14 

 and 281, on U.S. Hy. 14, July 19, 1958, Holt (PCH 788). codington county: 

 Watertown, July 19, 1958, Holt (PCH 789). 



