This afternoon the Brown Stockings play the St. Louis University Nine, and the friends of the professionals will have a chance to see their new catcher, McGinley, at work as he is to play behind the bat. To-morrow the third game with the Athletics takes place.-St. Louis Globe-Democrat, June 23, 1876
Changes in the Boston Nine....McGinley has been released, and has been engaged as change catcher for St. Louis.
-St. Louis Globe-Democrat, June 26, 1876
This is the first mention I've found of a new catcher to replace Tom Miller. Although there is no record of him playing in a League game for the Brown Stockings, McGinley is obviously Ted McGinley, who played in nine games for Boston in 1876. Doing a quick search, it appears that McGinley did play in several exhibition games for the Brown Stockings, giving John Clapp and his sore hands a needed rest.