''Udea ferrealis'' is a

moth Moths are a paraphyletic group of insects that includes all members of the order Lepidoptera that are not butterflies, with moths making up the vast majority of the order. There are thought to be approximately 160,000 species of moth, many of w ...

in the family Crambidae. It was described by George Hampson in 1900. It is found in

Amur The Amur (russian: река́ Аму́р, ), or Heilong Jiang (, "Black Dragon River", ), is the world's List of longest rivers, tenth longest river, forming the border between the Russian Far East and Northeast China, Northeastern China (Inne ...

in the

Russian Far East The Russian Far East (russian: Дальний Восток России, r=Dal'niy Vostok Rossii, p=ˈdalʲnʲɪj vɐˈstok rɐˈsʲiɪ) is a region in Northeast Asia. It is the easternmost part of Russia and the Asian continent; and is admini ...

. The

wingspan The wingspan (or just span) of a bird or an airplane is the distance from one wingtip to the other wingtip. For example, the Boeing 777–200 has a wingspan of , and a wandering albatross (''Diomedea exulans'') caught in 1965 had a wingspan of ...

is about 32 mm. The forewings are rufous with a fine antemedial line which is very oblique from the costa to the median nervure, then very sinuous. There is an elliptical darker rufous spot in the middle of the cell and a discoidal spot. There is also a minutely dentate postmedial line, curved from the costa to vein 3 and then oblique, as well as a terminal band with a dentate inner edge. The hindwings are whitish, suffused with pale brown, especially on the inner and terminal areas. There is also a dark point at the lower angle of the cell and a curved minutely dentate postmedial line.''Transactions of the Entomological Society of London'', Volume 48
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References

Moths described in 1900 ferrealis {{Udea-stub