See text Diestrammena is a 'camel' or 'cave-cricket' genus in the family Rhaphidophoridae.
Species in the genus are native to Asia, including Japan.
Note: this genus should not be confused with the similarly-named Diestramima which also belongs to the subfamily Aemodogryllinae.
The Orthoptera Species File[1] includes two subgenera and lists: subgenus Aemodogryllus Adelung, 1902 - Japan subgenus Diestrammena Brunner von Wattenwyl, 1888 - China, Japan, Indo-China and Sulawesi