sentences:  In these bugs, the male intromittent organ is formed by the coupling of the aedeagus with the left paramere, as in bed bugs.Females also exhibit paragenital modifications at the site of intromission, which include grooves and invaginated copulatory tubes to guide the male paramere.The evolution of traumatic insemination in "Coridromius" represents a third independent emergence of this form of mating within the true bugs.