Thaumatopsis pectinifer is a moth in the family Crambidae.

[1] It is found in North America, where it has been recorded from North Dakota to Oklahoma, Texas and southern Florida, as well as Michigan and Indiana.

[3] Adults are on wing in March, from May to June and from August to November.

The larvae feed on various grasses, including corn.

This article relating to the moth tribe Crambini is a stub.