Josef Redtenbacher (March 27, 1856, Kirchdorf an der Krems – July 18, 1926, Linz) was an Austrian entomologist and teacher. He specialized in the orders of Orthoptera (grasshoppers, locusts, and crickets), Phasmatodea (stick and leaf insects), Mantodea (mantis) and Blattodea (cockroaches), which are classically summarized as „Orthoptera“, as well as in the earwigs (Dermaptera), which are not assigned to the „Orthoptera“, especially from Austria-Hungary and Germany. Life Redtenbacher was born the son of the scythe dealer Franz Xaver Redtenbacher (1804-1871) and Theresia Redtenbacher née Lampl (1823-1883) in the wealthy market town of Kirchdorf an der Krems in what was then the Austrian Empire. He was the brother of the scythe dealer Simon Redtenbacher, the nephew of the chemist Josef Redtenbacher and the entomologist Ludwig Redtenbacher. Redtenbacher studied natural sciences at the University of Vienna from 1874 to 1878. He passed his teaching examination in 1879 in the subjects of natural history, mathematics and natural sciences and from 1880 worked in the teaching profession in Vienna. From 1892 to 1896 he taught at the German Realschule in Budweis (today České Budějovice). From 1896 to 1915 Redtenbacher was a professor at the grammar school (Gymnasiium) in Vienna-Wieden. He spent the last decade of his life in Linz. Scientific activity As early as 1886 he worked as a trainee at the Natural History Museum in Vienna. This activity resulted in a collaboration with the entomologists Ludwig Ganglbauer, Friedrich Moritz Brauer and especially with Carl Brunner von Wattenwyl. From 1889 he was a corresponding member of the Francisco Carolinum Museum, to which he gave most of his entomological collection in 1887. The Kremsmünster Monastery received the Upper Austrian grasshoppers. His achievements as an entomologist include, in particular, the creation of a "Monograph of the Conocephalinae" (German original: „Monographie der Conocephaliden“), the research of the „Orthoptera“ and earwigs of Austria-Hungary and Germany, whose identification tables form the basis of all later work on the orders processed here Central and Southeastern Europe formed. He also wrote (Vol. 1 & 3) together with Brunner von Wattenwyl (Vol. 2) an edit and complete overview of the stick insects. Of the stick insect taxa described by Redtenbacher, 570 species, 78 genera and some higher taxa are valid to date (as of November 2022). In addition, he published some smaller studies on the larvae of Myrmeleontidae (antlions) and other works on grasshoppers, of which he described 223 species and 53