Head width analysis of adult Locusta migratoria from Tsushima Island. Frequency distribution of head widths among female (A) and male (B) individuals. Relationship between head widths and total body length in fresh specimens (C). Box plot illustrating head width distribution by fresh female individuals (D) and male individuals (E). The figure presents data obtained from both recently collected fresh specimens and dry specimens gathered in 1930 and 1933 that were preserved at Kyushu University’s museum. Additionally, reference data from Hiura’s study (1976) are included.