Humphrey Silvester Evans was born in October 1890 in Shaftesbury, Dorset, England.
He was a British anthropologist and entomologist. After military service (1913-1920), during which he served in the Royal Army Medical Corps in England, Egypt, France, and Flanders, he entered the Colonial Medical Service as a Medical Officer. From 1920, he served mainly in Fiji. He donated over 5,000 Coleoptera samples to the British Museum's Natural History Department, collected between 1927 and 1951. In 1930, he sold a collection he had gathered among the Alunda and Bakaonde in north-western Rhodesia to the museum, likely just covering transport costs. This African collection was probably assembled shortly before October 1930.
In 1916, he married Emily Phyllis Irene Wheeler (1898–1993). He died on March 6, 1965, in Fiji.