Idiostomatinae Arrow, 1904 Allidiostomatinae is a subfamily of beetles in the scarab beetle family, Scarabaeidae.

It is distributed in southern South America.

Of the eleven species, seven are endemic to Argentina.

[2] The subfamily was made up of the single genus Allidiostoma until 2009, when a second was erected for the new species Parallidiostoma tricornum.

[1] Genera and species include:[3] This Scarabaeidae-related article is a stub.