Conchylodes octonalis, the eight-barred lygropia moth, is a snout moth in the family Crambidae.

[1] It is found in North America, where it has been recorded from central and southern California to Texas and from Iowa, Mississippi, Nevada, New Mexico, Oklahoma and Tennessee.

[2] The habitat consists of low-elevation arid areas.

Adults are on wing from late March to October.

The larvae have been recorded feeding on Heliotropium curassavicum.