38 Moths described in 1921

Adaina zephyria is a moth of the family Pterophoridae first described by William Barnes and Arthur Ward Lindsey in 1921. It is found in the United States (California), Mexico (Oaxaca), Peru (Huanaca), Venezuela, Bolivia, Costa Rica and Ecuador.

Alucita montana, the Montana six-plume moth, is a moth of the family Alucitidae. It was described by William Barnes and Arthur Ward Lindsey in 1921. It is found in North America from south-western Quebec and Vermont, west to British Columbia and south to Arizona, California and Texas.

Anthela oressarcha is a moth of the Anthelidae family. It is found in Australia.

Anthela tetraphrica is a moth of the Anthelidae family. It is found in Australia.

Clanis pratti is a species of moth of the family Sphingidae first described by James John Joicey and George Talbot in 1921. It is known from Sulawesi and surrounding islands in Indonesia.

Clostera paraphora is a species of moth in the family Notodontidae. It was first described by Harrison Gray Dyar Jr. in 1921 and it is found in North America.

Coleophora borea is a moth of the family Coleophoridae. It is found in the United States, including Ohio.

Cryptophlebia peltastica is a moth of the family Tortricidae. It is found throughout Africa from Ghana to South Africa and Eritrea, including islands of the Indian Ocean and is also known from Asia, the Pacific region (Guam) and from the Bahamas.

Deuterocopus honoratus is a moth of the family Pterophoridae. It is found in Queensland, Australia.

Emarginea dulcinea is a species of owlet moth in the family Noctuidae. It is found in North America.

Emmelina buscki is a moth of the family Pterophoridae first described by William Barnes and Arthur Ward Lindsey in 1921. It is found in North America, including Florida and Mexico, but has also been recorded from Costa Rica and Jamaica.

Emmelina suspiciosus is a moth of the family Pterophoridae. It is found in Ecuador.

Epipsestis nikkoensis is a moth of the family Drepanidae first described by Shōnen Matsumura in 1921. It is found in the Chinese provinces of Jilin, Shaanxi and Hubei and in Japan, Taiwan, the Russian Far East, Nepal, Bhutan, Myanmar, the Korean Peninsula, Thailand and northern Vietnam.

Erechthias psammaula, the brown-stripe moth, is a moth of the family Tineidae. It is found on Fiji, French Polynesia, Tonga and the Cook Islands.

Eudalaca homoterma is a species of moth of the family Hepialidae. It is known from South Africa.

Eudonia commortalis is a moth in the family Crambidae. It was described by Harrison Gray Dyar Jr. in 1921. It is found in North America, where it has been recorded from Alaska to British Columbia, Washington and California.

Gillmeria albertae is a moth of the family Pterophoridae first described by William Barnes and Arthur Ward Lindsey in 1921. It is known from the mountains of Alberta near Banff.

Graphania agorastis is a moth of the family Noctuidae. It was first described by Edward Meyrick in 1887 from specimens collected at Lake Guyon and Akaroa. It is endemic to New Zealand.

Graphania averilla is a moth of the family Noctuidae. It is endemic to New Zealand.

Helastia clandestina is a moth of the family Geometridae. This species is endemic to New Zealand. It is classified as "At Risk, Relict'" by the Department of Conservation.

Helcystogramma hystricella, the lanceolate helcystogramma moth, is a moth in the family Gelechiidae. It is found in the United States, where it has been recorded from Minnesota to Pennsylvania, south to Maryland and Kentucky, west to Oklahoma and Kansas.

Helicoverpa gelotopoeon, the South American bollworm moth, is a moth of the family Noctuidae. It is found in southern South America, including Chile and Argentina.

Hellinsia arion is a moth of the family Pterophoridae that can be found in North America, including Alberta and Arizona. The species was first described by William Barnes and Arthur Ward Lindsey in 1921.

Hellinsia delospilus is a moth of the family Pterophoridae. It is found in Peru and Ecuador.

Hellinsia falsus is a moth of the family Pterophoridae first described by William Barnes and Arthur Ward Lindsey in 1921. It is found in the US states of California and Arizona and in Mexico's Baja California.

Hellinsia malesanus is a moth of the family Pterophoridae. It is found in Peru.

Hellinsia praenigratus is a moth of the family Pterophoridae that is found in Peru and Ecuador.

Holocacista salutans is a moth of the family Heliozelidae. It was described by Edward Meyrick in 1921. It is found in Zimbabwe and the South African provinces of KwaZulu-Natal and Limpopo.

Homona tabescens is a species of moth of the family Tortricidae. It is found in south-east Asia, where it has been recorded from Java, Sabah, China, Thailand, Malaysia, New Guinea and Vietnam.

Isotrias joannisana is a species of moth of the family Tortricidae. It is found in central and southern Italy. There are also records for France and Spain.

Lithacodes gracea, the graceful slug moth, is a species of slug caterpillar moth in the family Limacodidae.

Malgassoclanis delicatus is a moth of the family Sphingidae. It is known from Madagascar.

Mompha sexstrigella is a moth in the family Momphidae. It has a Holarctic distribution. In Europe it is found in northern Fennoscandia and Estonia. It is also found in the Asian part of Russia, where it is known from the Altai mountains, southern Siberia and Sakhalin. In North America, it is found in Canada and the western United States.

Neotelphusa praefixa is a moth of the family Gelechiidae. It is found in North America, where it has been recorded from Alberta, British Columbia, Maine, Manitoba, Montana, Ontario, Quebec and Saskatchewan.

Nephele leighi is a moth of the family Sphingidae. It is known from the Seychelles.

Notoreas arcuata is a species of geometer moth endemic to New Zealand.

Opistoclanis is a genus of moths in the family Sphingidae, containing only one species Opistoclanis hawkeri.