An online resource based on the award-winning nature guide

Predatory Insects

Drama In The Goldenrod Patch

At this time of year when most flowers have gone by, Canada Goldenrod (Solidago canadensis) is a primary source of pollen and nectar for bees, beetles, butterflies, flies and many other insects. Consequently, goldenrod flowers are a popular place for insect-eating predators to linger.

Recently I spied an Ambush Bug that had captured a fly and had its proboscis inserted into it, contentedly sucking away the fly’s innards while I photographed it.  Unbeknownst to me or the Ambush Bug, another predator, a Bald-faced Hornet, had spied the bug with its prey. Although adult hornets consume liquids, usually sugars like the juice of fruits or nectar, their larvae are raised on a diet of insects, so adults are constantly looking for prey. Suddenly, out of nowhere, the hornet flew in, tussled with the Ambush Bug and flew off with the fly in its mandibles, landing on a nearby branch with the object of its thievery.

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Eastern Dobsonflies Emerging

7-9-18 male dobsonfly2_U1A0727

Eastern Dobsonfly (Corydalus cornutus) larvae, known as Hellgramites, are the top invertebrate predators in the rocky streams where they occur. In this stage they look like underwater centipedes and consume tadpoles, small fish, and other young aquatic larvae. Adults keep watch over them from a nearby area above the water.

After leaving their stream and pupating on land, the 4”-5 ½”-winged adults, referred to as Eastern Dobsonflies, emerge. Males can easily be distinguished from females by their large, sickled-shaped mandibles which the females lack. (The short, powerful mandibles of the female are capable of giving a painful bite, which the males’ mandibles are not.) Adults are primarily nocturnal and they do not eat. During their short lifespan (about three days for males, eight to ten days for females) they concentrate on reproducing.

The elongated jaws of the male are used both as part of the premating ritual (males place their mandibles on the wings of the females) and as weapons for fighting rival males.   (Thanks to Clyde Jenne for photo op.)

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