II. Gyrophaena (Gyrophaena) keeni species group

3. Gyrophaena (Gyrophaena) keeni Casey, 1911: 185 (CANADA: Alberta, British Columbia, New Brunswick, Ontario, Quebec, and Yukon Territory; UNITED STATES: Florida, Maine, Massachusetts, Montana, New Hampshire, New York, Tennessee, Washington and Wyoming) .

4. Gyrophaena (Gyrophaena) nanoides Seevers, 1951: 684 (CANADA: Ontario and Quebec; UNITED STATES: District of Columbia, Indiana, Iowa, Virginia, and Wisconsin) .

5. Gyrophaena (Gyrophaena) caseyi Seevers, 1951: 684 (CANADA: New Brunswick and Quebec; UNITED STATES: Michigan, New York, North Carolina, and Pennsylvania) .

III. Gyrophaena (Gyrophaena) laetula species group 6. Gyrophaena (Gyrophaena) laetula Casey, 1906: 300 (CANADA: New Brunswick; UNITED STATES: District of Columbia, Illinois, Indiana, Kentucky, Massachusetts, New York, Pennsylvania, Tennessee, Virginia, and Wisconsin). Gyrophaena fustifer Casey, 1906: 300 . Gyrophaena centralis Casey, 1906: 301 .