Bioacoustics of Megaulacobothrus

1 . Male............................................................................................................................................................2 - Female.........................................................................................................................................................4 2. Head and thorax brown; tegmina dark brown with narrow radial field, width near origin of RS narrower than subcostal field ................................................................................................................. M. latipennis - Head and thorax dark green; tegmina dark black with broad radial field, width near origin of RS broader than subcostal field.....................................................................................................................................3 3. Antennae long, more than 2 times the length of head and pronotum combined; mid antennomeres 4.1–5.2 times longer than wide; hind femur with stridulatory pegs mean number less than 165 ....... M. aethalinus - Antennae shorter, less than 2 times the length of head and pronotum combined; middle antennomeres 3.0– 3.5 times longer than wide; hind femur with stridulatory pegs mean number more than 185 ...................... .................................................................................................................................... M. jejuensis sp. nov. 4 . Head and thorax brown or green dorsally; antennae short, as long as head and pronotum length combined; mid antennomeres 2.5–3.0 times longer than wide; tegmina mesopterous, distinctly not extending to abdominal end or hind knees; hind femur stout, 4.0–4.8 times longer than greatest width .......................... ..................................................................................................................................... M. jejuensis sp. nov. - Head and thorax brown; antennae longer, more than 1.2 times of head and pronotum length combined; mid antennomeres 3.5–4.0 times longer than wide; tegmina macropterous, reaching/surpassing abdominal end or hind knees; hind femur slender, 5.0–5.5 times longer than greatest width.....................................5 5. Tegmina with wide radial field, the width near origin of RS two times wider than subcostal field; costal field 1.5 times wider than subcostal field. .............................................................................. M. aethalinus - Tegmina with narrow radial field, the width near the origin of RS as wide as subcostal field or costal field ................................................................................................................................................. M. latipennis