| Elcysma westwoodi | |
|---|---|
| |
| Male in Kōka, Shiga Prefecture | |
Scientific classification 
| |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Arthropoda |
| Class: | Insecta |
| Order: | Lepidoptera |
| Family: | Zygaenidae |
| Genus: | Elcysma |
| Species: | E. westwoodi
|
| Binomial name | |
| Elcysma westwoodi (Vollenhoven, 1863)
| |
| Synonyms | |
|
Agalope westwoodii Vollenhoven, 1863 | |
Elcysma westwoodi (often spelled Elcysma westwoodii), commonly known as the white-tailed zygaenid moth, is a species of moth in the burnet moth family Zygaenidae. It has a Palaearctic distribution, being found in Japan, the Korean Peninsula, China, and the Russian Far East. The species was first described by Samuel Constantinus Snellen van Vollenhoven in 1863 as Agalope westwoodii.
The white-tailed zygaenid is particularly known for its status as an agricultural pest for members of the family Rosaceae, and has been described as the most damaging pest for Prunus yedoensis trees. Studies have been conducted on the potential for the use of endoparasites in mitigating the extent of damage on crop trees.
The Japanese common name alludes to the swallow, of which the moth's hindwings resemble the tails of. The Korean common name refers to its status as an agricultural pest of the cherry tree.