Figures 39–42.Hydrochasma sinuatum sp. n. (Mexico. Sinaloa: 13 km NE of Concordia) 39 epandrium and cerci, posterior view 40 same, lateral view 41 internal structures of male terminalia (aedeagus [shaded], phallapodeme, gonite, hypandrium), ventral view 42 same, lateral view. Scale bar = 0.1 mm.