Elachista compsa

{{Short description|Species of moth}}

{{Speciesbox

| image = Elachista compsa.jpg

| image_caption =

| genus = Elachista

| species = compsa

| authority = Traugott-Olsen, 1974{{cite web|url= http://www.faunaeur.org/full_results.php?id=435458|archive-url= https://web.archive.org/web/20121015144222/http://www.faunaeur.org/full_results.php?id=435458|url-status= dead|archive-date= October 15, 2012|title=Elachista (Elachista) compsa Traugott-Olsen, 1974|publisher=Fauna Europaea|version=2.6.2|date=August 29, 2013|access-date=November 12, 2013}}

}}

Elachista compsa is a moth of the family Elachistidae. It is found from Fennoscandia and the Baltic region to Germany, Poland to Italy.

The wingspan is {{convert|8|-|11|mm}}.[http://www2.nrm.se/en/svenska_fjarilar/e/elachista_compsa.html Swedish Moths]

The larvae feed on Deschampsia cespitosa and Melica nutans uniflora. They mine the leaves of their host plant.{{cite web|url=http://www.bladmineerders.nl/minersf/lepidopteramin/elachista/compsa/compsa.htm|title=Elachista compsa Traugott-Olsen, 1974|publisher=Bladmineerders.nl|access-date=September 23, 2011|archive-url=https://web.archive.org/web/20120927000958/http://www.bladmineerders.nl/minersf/lepidopteramin/elachista/compsa/compsa.htm|archive-date=September 27, 2012|url-status=dead}} Larvae can be found from October to December. They then overwinter within the mine. In spring, they vacate the mine to pupate. There is a second generation in July. They have a light brown head.