I refer to your posting and follow-ups re Arthur Ahmuty. We know that he married Ursula D'Cruz and that they had nine children. My wife's family tree includes the name of Maria D'Cruz and we wander if these two ladies could be sisters?
I show some information below of the Colonel and we do have more references.
A fourth Ahmuty is Lieutenant Colonel Ahmuty, who in 1779 was commanding the cantonments around Midnapore, about 70 miles west of Calcutta, according to The Parliamentary Register: Or, History of the Proceedings and Debates of the House of Commons, by Great Britain, Parliament, (text available on line through Google Books) in a report starting on page 447 regarding a dispute between the Supreme Court in Calcutta, the East India Company and the Governor and Council.Achmuty's troops included, on 3rd December 1779 (page 450), a Lieutenant Stephen Bomford (page 452) who may well be David Bomford's illegitimate son (11.9).The given name of that Ahmuty is not stated.He may well, though, be the Major Arthur Ahmuty listed in Baptisms in Calcutta: 1767 to 1777.According to that document, the registers of St Johns Church recordthat Major Arthur Ahmuty and his wife Ursula baptised a son Richard on 15th October 1774 and a son Samuel on 13th January 1777.Footnote (58) in the document says of the son Richard, "Richard Ahmuty: query: writer on the Bengal establishment, 1791: Commissioner of Behar, 1797: Collector of Allahabad, 1803: Judge and Magistrate of Furruckabad, 1804. Proceeded to Europe, 1806, and resigned in England, March 30, 1808".