1) Bug-hunter 2) Bugologist 3) Butterfly collector 4) Entomologist 1) Butterflies 
A person who studies butterflies and moths
A lepidopterist or aurelian is a person who specialises in the study of Lepidoptera, members of an order encompassing moths and the three superfamilies of butterflies, skipper butterflies, and moth-butterflies. The term also includes hobbyists who are not formal scholars, who catch, collect, study, or simply observe lepidopterans. ==Fictional lepi...
• (n.) One who studies the Lepidoptera.
Lep`i·dop'ter·ist noun (Zoology) One who studies the Lepidoptera. 
[n] - an entomologist who specializes in the collection and study of butterflies and moths
lepidopterist 1. An entomologist who specializes in the collection and study of butterflies and moths. 2. A person who studies the order of insects called Lepidoptera, a large order including butterflies and moths.
someone who studies butterflies and moths (insects in the Order Lepidoptera).
lepidopterologist noun an entomologist who specializes in the collection and study of butterflies and moths