I think Ladyhawk 
meant the 1881 Scotland census.
I did
have modified by post
This might be James Lockhart born c1855 Barr from 1881c with his parents and siblings
on 1861 c
Water of Minnock Rowantra Poll, Barr, Ayrshire, Scotland
Robert Lockhart 37 1824 Stewarton, Ayrshire occ. Gamekeeper
Bettsie Lockhart 31 1830 Kilmaurs, Ayrshire
James Lockhart 7 1854 Barr, AyrshireRobert Lockhart 6 1855 Barr, Ayrshire
Tairley D Lockhart 4 1857 Barr, Ayrshire
William Lockhart 4 1857 Barr, Ayrshire
David Lockhart 2 1859 Barr, Ayrshire
1849 marriage
https://familysearch.org/ark:/61903/1:1:XTRW-N65ch Robert parents Robert Lockhart & Bethia DINNING
https://familysearch.org/ark:/61903/1:1:XY1R-XX3Ch Fairla Dinning Lockhart
https://familysearch.org/ark:/61903/1:1:XY1R-XX5Didn't spot one for James on familysearch but there are others with parents
named Robert LOCKHART & Bethia DINNING
James doesn't appear to be living at home 1871c
Taglaney, Rowantree Road, Barr, Ayrshire,
Robert Lockhart 1826 Ayrshire occ Gamekeeper
Bethia Lockhart 1830 Kilmaurs, Ayrshire
Robert Lockhart 1856 Barr, Ayrshire
William Lockhart 1858 Barr, Ayrshire
David Lockhart 1860 Barr, Ayrshire
Andrew C Lockhart 1863 Barr, Ayrshire
Christina Lockhart 1864 Barr, Ayrshire
Mungo R Lockhart 1867 Barr, Ayrshire
it would appear Mungo's middle name is Parker
https://familysearch.org/ark:/61903/1:1:KM2Z-LBZand Mungo's son married in Canada
https://familysearch.org/ark:/61903/1:1:FMF6-PSWThis might be James LOCKART born 1854 Barr occ Gen Servt.
https://familysearch.org/ark:/61903/1:1:VBR7-311