According to the source, Humphrey Pugh Jones and his brother Hugh were sent to America by their parents to avoid impressment during the Napoleonic Wars. One Hemphry Jones is included on a Passenger List of a ship bound for Philadelphia, PA, USA in 1801. [ http://search.findmypast.com/results/united-states-records-in-immigration-and-travel?firstname=humphry&firstname_variants=true&lastname=jones&eventyear=1810&eventyear_offset=10]
"United States Census, 1850," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MZM9-W6X : 9 November 2014), Humphrey P Jones, Lloyd, Ulster, New York, United States; citing family 660, NARA microfilm publication M432 (Washington, D.C.: National Archives and Records Administration, n.d.). =[ https://familysearch.org/search/record/results?count=20&query=%2Bgivenname%3A%22Humphry%20Pugh%22~%20%2Bsurname%3AJones~%20%2Bmarriage_place%3A%22New%20York%22~%20%2Bmarriage_year%3A1815-1815~]
The only Humphry Jones I can find who was baptized in Merionithshire in 1781:
"Wales, Merionethshire, Parish Registers, 1538-1912," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:KCGJ-Y2J : 3 September 2015), Humphrey Jones, 16 May 1781, Baptism; from "Parish Records Collection 1538-2005," database and images, findmypast (http://www.findmypast.com : 2012); citing Llandrillo, Merionethshire, Wales, The National Archives, Kew, Surrey; FHL microfilm 2,422,651.
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