Insect collecting Insect collecting has left traces in European cultural history, literature and songs (e.g., Georges Brassens's "La chasse aux papillons" ("The Hunt for Butterflies")). The practice is still widespread in many countries, and is particularly common among Japanese youths. Insects are passively caught using funnels, pitfall traps, bottle traps, malaise traps, flight interception traps and other passive types of insect traps, some of which are baited with small bits of sweet foods (such as honey). Different designs of ultraviolet light traps such as the Robinson trap are also used by entomologists for collecting nocturnal insects (especially moths) during faunistic survey studies.
Comma category with domain formula_65" in. An object of formula_78 is called a "morphism from formula_4 to formula_80" or a "formula_4-costructured arrow with codomain formula_80" in. Another special case occurs when both formula_4 and formula_5 are functors with domain 1. If formula_85 and formula_86, then the comma category formula_6, written formula_88, is the discrete category whose objects are morphisms from formula_8 to formula_10. An inserter category is a (non-full) subcategory of the comma category where formula_91 and formula_92 are required. The comma category can also be seen as the inserter of formula_93 and formula_94, where formula_95 and formula_96 are the two projection