Lepidopterology is a branch of entomology concerning the scientific study of moths and the two superfamilies of butterflies. Someone who studies in this field is a lepidopterist or, archaically, an aurelian.
A Lepidoptera specimen drawer in a museum collection in Poland
Another Lepidoptera specimen drawer in a museum collection in Poland
Géographe and Naturaliste
Entomology is the scientific study of insects, a branch of zoology. In the past the term insect was less specific, and historically the definition of entomology would also include the study of animals in other arthropod groups, such as arachnids, myriapods, and crustaceans. This wider meaning may still be encountered in informal use.
Plate from Transactions of the Entomological Society, 1848
Example of a collection barcode on a pinned beetle specimen
"The butterfly catcher", painting by Carl Spitzweg
The Entomology Research Collection at Lincoln University, New Zealand, with curator John Marris