Pleske's grasshopper warbler 
(Helopsaltes pleskei), also known as Styan's grasshopper warbler and Taczanowski's warbler

Styan's grasshopper warbler (Helopsaltes pleskei), also known as Pleske's grasshopper warbler and Taczanowski's warbler, is a species of Old World warbler in the family Locustellidae. 
The bird breeds in eastern Siberia to Korea, Kyushu and Izu Islands; wintering in South China.

Locustellidae, Locustella is from Latin and is a diminutive of locusta, "grasshopper".
The genus name Helopsaltes combines the Ancient Greek helos meaning "marshy ground" and psaltis "a chanter".