13. Little Wakarusa River, Sec. 18, T. 13 S, R. 21 E, June 21, 1952. 14. Rock Creek, Sec. 33, T. 13 S, R. 18 E, Oct. 2, 1952. 15. Wakarusa River, Sec. 14, T. 13 S, R. 20 E, March 28, 1953. Several collections made between 1912 and 1948 are deposited in the University of Michigan Museum of Zoology. In the annotated list these collections, all from Douglas County, are designated "UMMZ": 1. Rock Creek, June 9, 1912. 2. Oxbow Lake, 6 mi. E Lawrence, 1924 (several dates). 3. Wakarusa River, 7 mi. SE Lawrence, April 9, 1924. 4. Rock Creek, 9 mi. SW Lawrence, April 14, 1924. 5. Rock Creek, 12-1/2 mi. S and 8-1/2 mi. E Topeka, July 4, 1948. Our collections, all of which were made in 1959, are identified by the letters DM followed by a station-number. Stations are numbered consecutively beginning at the mouth of the Wakarusa River and proceeding up each tributary as it is encountered. _Description of Stations_ 1. Wakarusa River, Sec. 4, T. 13 S, R. 21 E, March 14 and Oct. 18. Mouth of Wakarusa to one-half mile upstream; width _ca._ 25 feet; depth to 4 feet; bottom mud; banks mud, 10 feet high; current slight; water turbid. 2. Wakarusa River, Sec. 7, T. 13 S, R. 21 E, March 21. Width _ca._ 25 feet; bottom mud; banks mud, 10-20 feet high. 3. Little Wakarusa Creek, Sec. 19, T. 13 S, R. 21 E, May 2. Long sandy riffles, 6-10 inches deep; pools to 3 feet deep; bottom sand and mud; water slightly turbid. 4. Little Wakarusa Creek, Secs. 29 and 32, T. 13 S, R. 21 E, May 2. Riffles 8-10 inches deep having rubble bottom; pools to 4 feet deep having mud bottom; width 15-30 feet. 5. Little Wakarusa Creek, Sec. 7, T. 14 S, R. 21 E, May 2. Riffles 6-8 inches deep having gravel bottom; pools to 3 feet deep; bottom gravel and mud; width 8 to 15 feet; water slightly turbid. 6. Cole Creek, Sec. 21, T. 13 S, R. 20 E, May 2. Riffles 8-12 feet wide, 6 inches deep, bottom of flat, fragmented shale; pools having shale and mud bottom; water slightly turbid. 7. Cole Creek, Sec. 10, T. 14 S, R. 20 E, May 2. Small, shallow creek having sand bottom; water slightly turbid. 8. Cole Creek, Sec. 23, T. 14 S, R. 10 E, May 2. Banks steep, 20 feet high; bottom sand and hard clay; water clear. 9. Tributary to Yankee Tank Creek, Sec. 10, T. 13 S, R. 19 E, May 14. Width 2-10 feet; bottom mud; water turbid. 10. Washington Creek, Sec. 6, T. 14 S, R. 19 E, Feb. 26. Width _ca._ 25 feet; bottom rubble and gravel; water clear. 11. Washington Creek, Sec. 11, T. 14 S, R. 18 E, Feb. 26, March 28, March 30, and Oct. 18. One-half mile below dam at Lone Star Lake; width 10-15 feet; bottom gravel; water clear. 12. Tributary of east arm of Lone Star Lake, Sec. 13, T. 14 S, R. 18 E, March 31. Width 5-7 feet; bottom limestone rubble; water clear.