Catoptria trichostomus is a moth in the family Crambidae. It was described by Hugo Theodor Christoph in 1858.[1] It is found in North America, where it has been recorded from Alaska to Labrador and Baffin Island in the Northwest Territories, south in the Rocky Mountains to southern Alberta.[2] It is also found in the Russian Far East. The habitat consists of coniferous forests.
The wingspan is 17–20 mm.