Blastobasis graminea is a moth in the family Blastobasidae. It is found in Colombia, Venezuela, Costa Rica, Mexico (Autlan and Veracruz) and the south-eastern United States (southern Louisiana).
The length of the forewings is 8.9âÂÂ9 mm.
The larvae bore the stem of Saccharum officinarum, Sorghum aethiopicum, Zea mays, Coix lacryma-jobi, Setaria paniculifera and Spartina alterniflora.