''Micromastra isoldalis'' is a species of

snout moth The Pyralidae, commonly called pyralid moths, snout moths or grass moths, are a family (biology), family of Lepidoptera in the ditrysian Taxonomic rank, superfamily Pyraloidea. In many (particularly older) classifications, the grass moths (Cramb ...

, and the only species in the genus ''Micromastra''. It was described by

William Schaus William Schaus (January 11, 1858, in New York City – June 20, 1942) was an American Entomology, entomologist who became known for his major contribution to the knowledge and description of new species of the Neotropical realm, Neotropical Lepido ...

in 1940 and is known from the US territory of

Puerto Rico ; abbreviated PR), officially the Commonwealth of Puerto Rico, is a Government of Puerto Rico, self-governing Caribbean Geography of Puerto Rico, archipelago and island organized as an Territories of the United States, unincorporated territo ...

References

Moths described in 1940 Pyralinae Monotypic moth genera Moths of the Caribbean Pyralidae genera {{Pyralinae-stub