Parasthena

{{Short description|Genus of moths}}

{{Speciesbox

| image =

| parent_authority = Warren, 1902

| taxon = Parasthena flexilinea

| authority = Warren, 1902{{cite web |last=Yu |first=Dicky Sick Ki |url=http://www.taxapad.com/local.php?taxonidLC=82846550 |title=Parasthena Warren 1902 |website=Home of Ichneumonoidea |publisher=Taxapad |archive-url=https://web.archive.org/web/20160304075104/http://www.taxapad.com/local.php?taxonidLC=82846550 |archive-date=March 4, 2016}}

| display_parents = 2

| synonyms = *Hydrelia flexilinea

}}

Parasthena is a monotypic moth genus in the family Geometridae. Its only species, Parasthena flexilinea, is found on Sulawesi, in the Philippines and Borneo and possibly on Seram and Papua New Guinea. Both the genus and species were first described by Warren in 1902.{{cite journal |last1=Xue |first1=Dayong |last2=Scoble |first2=Malcolm J. |date=June 27, 2002 |url=https://www.biodiversitylibrary.org/page/40870918#page/79/mode/1up |title=A review of the genera associated with the tribe Asthenini (Lepidoptera: Geometridae: Larentiinae) |journal=Bulletin of the Natural History Museum |series=Entomology Series |volume=71 |issue=1 |pages=77–133 |doi=10.1017/S0968045402000044}}

The ground colour of the wings is pale grey-brown with fine grey-brown fasciation and black discal spots.{{cite web |last=Holloway |first=Jeremy Daniel |url=http://www.mothsofborneo.com/part-10/eupitheciini/eupitheciini_33.php |title=Parasthena Warren Gen. rev. |website=The Moths of Borneo |accessdate=March 10, 2019}}