Manuals contain information on

The correct option is: identification of names of species found in a particular area.

In taxonomic studies, various taxonomic aids are used to store, organize, and retrieve information about different organisms. Let's analyze the purpose of these aids to understand what manuals contain:
1. Manuals: Manuals are useful resources that provide information for the identification of names of species found in a particular geographic area. They help researchers and students identify specimens by providing keys, descriptions, and other diagnostic features.
2. Monographs: A monograph contains comprehensive taxonomic information on any one taxon (such as a single family or genus) at a time.
3. Flora: Flora contains the actual account of the habitat and distribution of plants in a given area. It acts as an index to the plant species of that specific region.
4. Catalogues: A catalogue is an alphabetical list of species found in a particular area, often accompanied by brief descriptions and references.

Based on these definitions, manuals specifically contain information regarding the identification of names of species found in a particular area.