D. W. Donnelly
Perhaps this is him: Daniel Webster Donnelly 1862–1908
...Captain Donnelly, San Mateo Wheelmen...
Thomas Stevens finishes his around-the-world bicycle journey in San Francisco, January 8, 1887.
S. H. Knapp Jr. and D. W. Donnelly are two of the members [of the Bay City Wheelmen] residing in San Mateo. They are invaluable men on the occasion of picnic runs, and have a pleasant habit of hiding a three-gallon can of fresh milk near the roadside whenever the club has a run beyond San Mateo. On a warm day it is easy to understand how acceptable their habit is and the stampede of riders for the can is worth seeing. They usually form a line and are allowed one cup at a time. When the first has had a drink he goes to the foot of the line and awaits his turn again, as do all the others until the can is empty.
BAY CITY WHEELMEN, Well-Known Athletes Who Travel Around on Wheels. - The San Francisco Examiner, Oct 14, 1888
Steve Knapp, as lecturer, was a huge success. After absorbing a great deal of information regarding dams, the boys started for the beach, and were soon swimming in the pleasantly warm waters of the Bay. On the road leading from the beach is the home of D. W. Donnelly, a member of the [Bay City Wheelmen] club. The riders were invited in and regaled with fruit and watermelons, freshly picked.
To the Summit of Mount Diablo by Wheel. - Wheel. - San Francisco Chronicle, 08 Apr 1889