Figs 18–21: Developmental stages of Exochomoscirtes. (18) E. hajeki, submerged larva. Note the long antennae and the air bubble at the tip of abdomen. (19) E. hashimi spec. nov., developmental stages seen on bamboo wall above the water surface: one larva ready for pupation, one pupa, two freshly emerged adults, one pale adult still connected to larval exuvia, four exuviae remains. (20) E. chiangmaiensis/ carinensis larva with broken off antennae, enveloped by a pupal chamber made of debris (front part of pupal chamber removed). (21) E. hajeki pupa attached to the bamboo wall inside the unfinished pupal chamber.