Occidentalia

{{Short description|Genus of moths}}

{{Speciesbox

| genus = Occidentalia

| parent_authority = Dyar & Heinrich, 1927

| species = comptulatalis

| authority = (Hulst, 1886)

| synonyms =

• Crambus comptulatalis Hulst, 1886
• Acigona comptulatalis

| display_parents = 3

}}

Occidentalia is a monotypic moth genus of the family Crambidae described by Harrison Gray Dyar Jr. and Carl Heinrich in 1927.{{cite web |last=Nuss |first=M. |display-authors=etal |date=2003–2017 |url=http://globiz.pyraloidea.org/Pages/Reports/TaxonReport.aspx |title=GlobIZ search |website=Global Information System on Pyraloidea |accessdate=December 22, 2017}} It contains only one species, Occidentalia comptulatalis, described by George Duryea Hulst in 1886. It is found in North America, where it has been recorded from Alberta, Indiana, Maine, Manitoba, Minnesota, New York, Ontario, Quebec and Saskatchewan.[http://mothphotographersgroup.msstate.edu/species.php?hodges=5474 "800786.00 – 5474 – Occidentalia comptulatalis – (Hulst, 1886)"]. Moth Photographers Group. Mississippi State University. Retrieved December 22, 2017.

The wingspan is 23–26 mm. Adults are on wing from mid-July to August in one generation per year.

The larvae feed on Scirpus acutus, Scirpus americanus and Scirpus validus.{{cite web |author1=Bird, C. D. |author2=Schmidt, B. C. |name-list-style=amp |date=April 24, 2003 |url=https://search.museums.ualberta.ca/g/2-2906 |title=Species Details: Occidentalia comptulatalis |website=University of Alberta Museums |publisher=E.H. Strickland Entomological Museum |access-date=December 28, 2020}}