It is unfortunate that Barry's first image,
"from a photo album at the Alexander Turnbull Library and shows the collar badges with scrolls attached being worn by a captain. (circa late 1880-1890's)," is unnamed or dated.
However, taking a few facts into account, such as the cuff rank, which is that of a Lieutenant, and that the crest of the Duke of Wellington was first worn in 1892 as a badge by the Wellington City Rifles, I can pretty much narrow it down to being just one of four officers, with Lieutenant W. G Duthie at the top of my list.
The following picture shows Corporal Halpin of the Wellington City Rifles.
The picture is from the New Zealand Graphic and is dated 6th March 1897.
Note that Halpin is wearing what looks like a glengarry badge. (Oldham 2/220)
CORPORAL. HALPIN. Wellington City Rifles. Winner of the Last Try. Taken from the New Zealand Gra.jpg