1) Animal scientist 2) Bug-hunter 3) Bugologist 4) Scientist who studies insects 5) Zoologist 1) Bugologist 2) Lepidopterist 3) Thoraxcollector 
Someone who studies insects
• (n.) One versed in entomology.
A person who studies insects.
En`to·mol'o·gist noun [ Confer French entomologiste .] One versed in entomology. 
[n] - a zoologist who studies insects
entomologist Someone who specializes in the study of insects.
scientist who studies insects
someone who studies insects.
bugologist noun a zoologist who studies insects
a scientist who studies insects.
scientist who studies insects; entomologists study insect physiology, behavior, form and structure, taxonomy, and ecology, as well as pest management and other disciplines that involve insects