New genus of the subfamily Eutrombidiinae Thor, 1935 (Parasitengonina, Trombidioidea, Microtrombidiidae) associated with the adults of Calomera alboguttata (Klug, 1832) (Coleoptera, Carabidae)

The genus Arabium gen. nov . (subfamily Eutrombidiinae, tribe Hexathrombiini), with the species, A. calomerae sp. nov ., is described based on larvae. Individuals of the new species were abundantly found attached to the second thoracic sternite of the tiger beetle, Calomera alboguttata (Klug, 1832), while a few were found attached to abdominal sternites and hind leg. The taxonomic position of the new genus is discussed in detail, and a diagnostic key to valid genera and species of the tribe is provided.