The St. Croix Snaketail, like other insects, is a diecious organism.  The males initiate mating by searching a small stretch of river in search of a mate.  Once a mate is found, the actual mating process for has been reported to occur while perched on vegetation close to their river.  After mating, the female uses the current of the river to disperse her eggs, which form aggregations.  The discoverers of this species found that the eggs of the St. Croix Snaketail are found mixed in with those of other snaketail species (Vogt and Smith 1993).  When the larvae hatch, they stay in the stream for a year before they become fully mature.  In their second year (when they mature), they crawl up on land and molt into their adult forms.  Pictured below is a molted exoskeleton, or exuviate, of Ophiogomphus susbehcha. Information courtesy of The Minnesota DNR.

Photo Matt Berg