and "Die Arachniden" are different ways of carrying out the same project and they can both be considered as autonomous works, whereas Brignoli – an important cataloguer in arachnology – regarded "Monographie der Spinnen" only as a sort of blueprint for "Die Arachniden". Die Arachniden Until the end of the 18th century, all studies of spiders, scorpions, and related forms were treated as part of the wider study of entomology, for these were described as wingless insects and included in one genus, the Aranea of Linnaeus, of perhaps 500 different species. Based on Walckenaer's "Fauna Parisienne" (1802) Latreille established the first set of genera for spiders in his work, which is marking the real beginning of arachnological systematics, and which was extended by Walckenaer into the important "Histoire naturelle des Insectes Aptères" (1837–1847). During the mid-19th century, the centre of activity shifted away from France to Germany. An important part of this shift was due to the 14-volume work of Hahn and C. L. Koch, "Die Arachniden" (1831–1848). In contrast to the French manuscripts with their terse descriptions and infrequent illustrations, the 2000-plus pages of beautifully coloured plates of this work captured the attention of zoologists everywhere. French arachnologist Simon was incited by the high number of species, described from Germany in "Die Arachniden", while from his native France almost nothing had been done. In particular, "Die Arachniden" was very influential in founding a German tradition of active interest in arachnology, which flourished for nearly a century. Its major shortcoming, as was realized later, was the lack of a natural scheme of classification, particularly above the family level. Complete list of works (all illustrated by Hahn himself) Voegel(,) aus Asien, Africa, America, und Neuholland, in Abbildungen nach der Natur mit Beschreibungen. 19 installments, Lechner: Nuremberg, 1818–1836. Monographia Aranearum – Monographie der Spinnen. 8 installments, Lechner: Nuremberg, 1820–1836. Naturgetreue Abbildungen zur allgemeinnützigen Naturgeschichte der Thiere Bayerns. Author: Nuremberg, 1826–1828. Nurnberg, Lechner, 1826. (PDF) (together with Jacob Ernst von Reider Fauna Boica, oder gemeinnützige Naturgeschichte der Thiere Bayerns. Zeh: Nuremberg, 1830–1835. Die Arachniden. Getreu nach der Natur abgebildet und beschrieben. 2 volumes, Zeh: Nuremberg, 1831–1834 (from the 3rd volume onwards continued by C. L. Koch). Die wanzenartigen Insecten. Getreu nach der Natur abgebildet und beschrieben. 3 volumes, Zeh: Nuremberg, 1831–1835 (from the 4th volume onwards continued by G. A. W. Herrich-Schäffer). Gründliche Anweisung Krustenthiere, Vielfüße, Asseln, Arachniden und Insecten aller Klassen zu