Herbert Druce
He is not to be confused with his son , the English entomologist Hamilton Herbert Druce ( 1869 – 21 June 1922 ) , who also worked on Lepidoptera . 
<triplet> Hamilton Herbert Druce <subj> Herbert Druce <obj> father <subj> 21 June 1922 <obj> date of death <triplet> Herbert Druce <subj> Hamilton Herbert Druce <obj> child