He was the son of Eoin MacNeill founder of the Irish Volunteers which Niall MacNeill joined later becoming an officer in the Irish Army. With the rank of Colonel he specialised in surveying, training with the Royal Engineers on the Isle of Wight. After retiring from the army he worked for the State Ordnance Survey and he was made Assistant Director in 1935.
- Anon. 1970 Obituary Irish Naturalists' Journal 16:289-90.
- Longfield, C. 1970 Tribute to Colonel MacNeill as an entomologist. Irish Naturalists' Journal 16: 290-291.
- Habitas Bibliography very incomplete but lists 44 papers
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