Fritz Rühl, also Roule, was a Swiss

Switzerland

Switzerland name of one of the Swiss cantons. ; ; ; or ), in its full name the Swiss Confederation , is a federal republic consisting of 26 cantons, with Bern as the seat of the federal authorities. The country is situated in Western Europe,Or Central Europe depending on the definition....

 entomologist. He was a professional insect collector and insect dealer who worked with the Berlin

Berlin

Berlin is the capital city of Germany and is one of the 16 states of Germany. With a population of 3.45 million people, Berlin is Germany's largest city. It is the second most populous city proper and the seventh most populous urban area in the European Union...

 natural history dealers and publishers Alexander Heyne

Alexander Heyne

Alexander Heyne was a German entomologist who specialised in Lepidoptera.He was the son of Ernst Heyne also an entomologist as was Martin Heyne Alexander's brother...

 and Otto Staudinger

Otto Staudinger

Otto Staudinger was a German entomologist and a natural history dealer considered one of the largest in the world specialising in the collection and sale of insects to museums, scientific institutions, and individuals....

. His Hymenoptera

Hymenoptera

Hymenoptera is one of the largest orders of insects, comprising the sawflies, wasps, bees and ants. There are over 130,000 recognized species, with many more remaining to be described. The name refers to the heavy wings of the insects, and is derived from the Ancient Greek ὑμήν : membrane and...

 collections were sold to Paolo Magretti and are conserved in the Museo Civico di Storia Naturale di Genova

Museo Civico di Storia Naturale di Genova

The Museo Civico di Storia Naturale di Genova is a natural history museum in Genoa, northern Italy.-External links:*...

. He supplied collections of Lepidoptera und Coleoptera from around the world to the Istituto Sperimentale per la Zoologia Agraria

Istituto Sperimentale per la Zoologia Agraria

The Istituto Sperimentale per la Zoologia Agraria , located in Florence, Italy, is the oldest phytopathology centre in the world....

 in Florence.

Rühl edited Die palaearktischen Grossschmetterlinge und ihre Naturgeschichte. Band 1. Leipzig, Ernst Heyne (1892-1895), a monograph

Monograph

A monograph is a work of writing upon a single subject, usually by a single author.It is often a scholarly essay or learned treatise, and may be released in the manner of a book or journal article. It is by definition a single document that forms a complete text in itself...

 with the Berlin insect dealer Max Bartel (1879-1914) and wrote scientific papers on Coleoptera.