This neat looking fellow is a Waved Light Fly, Pyrgota
undata. It is a night flier that is
sometimes attracted to light. During the
day, it finds a secluded place to await the return of darkness. At first glance the coppery color and dark
wings suggest a wasp. Not only does it
look like a wasp, the attitude of the wings makes it appear to be an agitated
wasp.
The wasp imagery is only fleeting. The presence of halteres, those short rods
capped with white knobs, quickly identifies it as a type of fly. Halteres are situated behind the wings and function as
stabilizers to allow balanced flight.
All flies have them.
The fly also appears to be looking upward with a strange
forked tongue appendage emerging from the mouth. This is another false image. That is the top of the head, not a
mouth. The protrusions are antennae.
The orientation of the head is much clearer to see from the
side. This is not my first encounter
with this species, but it is the first time I’ve found a live specimen. A fly on the hoof is much more interesting
than a desiccated corpse.
The Wavy Light Fly is a parasitic species whose larvae
develop inside June Beetles. The adult
fly deposits its egg directly on the beetle.
When the egg hatches, the larva burrows inside and begins feeding. The beetle eventually dies and the fly larva pupates
inside the dead beetle’s body. I’ll have
to start cracking open dead June Beetles to see if I can find a fly pupa.
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