Mihi itch or Mihisucht is the ambition to describe new species (or other taxa: subspecies, hybrids, genera, etc.) as a means to immortalize one's name. ' is the dative form of the Latin word ego, thus "mihi itch" means to satisfy one's egotistical impulses. The expression appeared in print as early as 1884.
A consequence of the Mihi itch may be the unwarranted description of new taxa, differing only slightly from already established taxa, leading to taxonomic inflation. A more extreme case may be termed taxonomic vandalism when a large number of species are described with limited scientific evidence.