Abstract
Spermatogonial and/or spermatocyte chromosomes of six lucanid species, and female somatic chromosomes from brain of Platycerus delicatulus delicatulus in Japan were examined with the modified Crozier's techniques. Ceruchus lignarius lignarius, Platycerus delicatulus delicatulus and Nicagus japonicus possessed n=10 (XYp). Aegus laevicollis subnitidus and Prismognathus dauricus had n=13 (XYp), Nigidius lewisi n=16 (XYp), and Dorcus titanus (D. t. castanicolor, D. t. tatsutai) n=6 (XYp).
