A 1777 tax list of what is now Putnam County, New York, includes several Crosbys. See http://genealogytrails.com/ny//putnam/history/chapter4.html. Presumably one is the father or grandfather of our Elisha Crosby. See J. Kelsey Jones' analysis of many of these men in a post from several years ago. Some Fosters, Conklins and one Garrison are also listed.