The species is named in honor of Lord Walsingham (Thomas de Grey), a pioneer microlepidopterist who had collected extensively in the general areas of the type-locality during 1871-1872.
According to the entomologist Thomas de Grey (1843-1919), the larvae of this species may occasionally be found in the horns of living animals.
The river was named in 1861 by the explorer and surveyor Francis Gregory after Thomas de Grey, 2nd Earl de Grey who was, at the time, President of the Royal Geographical Society.
His collection was acquired by Thomas de Grey, 6th Baron Walsingham and later donated to the Natural History Museum.
:The name of the present species was misapplied to S. afflictana by Baron Walsingham in 1879.
Thomas de Grey, 2nd Earl de Grey (1781-1859), British Tory politician and statesman
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Thomas de Grey, 6th Baron Walsingham (1843-1919), English politician and amateur entomologist
In 1833 he succeeded his aunt as second Earl de Grey according to a special remainder and also inherited the Wrest Park estate in Silsoe, Bedfordshire.
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On her death, the Earldom of de Grey and the Barony of Lucas passed under their respective remainders to her nephew, the 3rd Baron Grantham, who became 2nd Earl de Grey and 6th Baron Lucas.
Hugh de Grey (born Chillingham, Northumberland, c. 1203), father of John de Grey, born in Scotland, and grandfather of Thomas de Grey of Heton (Heton, Northumberland, circa 1266 - Angus, Scotland, 1310), whose son Sir Thomas de Grey of Heaton (circa 1297 - bef. 12 March 1343/1344) was taken prisoner by the Scots at Bannockburn and married circa 1327 Agnes (possibly Agnes de Beyle, born Heton, Northumberland, c. 1301), being the parents of Sir Thomas Grey
de Grey was the third son of Thomas de Grey, MP, of Merton, Norfolk, and Elizabeth, daughter of William Windham.