All organisms, including beetles, have their scientific names, which are written in Latin, Greek or Latinized expressions of other languages.

Why? Because these names must be clearly understood by everyone around the world.
To this end, the International Commission on Zoological Nomenclature (abbreviated ICZN; website: http://iczn.org/) has been established to publish the International Rules on Zoological Nomenclature. In this publication, the rules and standards governing the scientific naming of animal taxa (genera, species, subspecies…), as well as higher taxonomic units (orders, superordinates, families…) are clearly given.
How to write the names of beetles correctly?

The basic names of all species are binomial and consist of generic and generic names:
Pachnoda marginata – species belonging to the genus Pachnoda
Sometimes the species is still divided into subspecies (subspecies):
Pachnoda marginata peregrina
Pachnoda marginata marginata
The names of the species (and higher and lower taxa) are followed by the names of the year:
Pachnoda marginata peregrina (Kolbe, 1906)
Pachnoda marginata (Drury, 1773)
These names tell who described the species as first (subspecies or other taxonomic unit).