... look a little closer at that dead (or alive!) "leaf" or "twig", look under leaves and flowers, and take the time to turn rocks and logs over. Hold these thoughts on a nature hike, otherwise it's easy to miss out on the really interesting, captivating and ofttimes amusing things going on in the wonderful world of nature.
Sometimes you just have to be lucky enough to be in the right place at the right time. I would have overlooked this tiny green spheroid on a grape leaf had I not caught a female Hummingbird Clearwing in the act of ovipositing.
Tuesday, July 30, 2013
Always Look Twice ...
Thursday, June 17, 2010
A Wolf in Sheep's Clothing
What looks like an innocuous bumblebee ...
... isn't a bee at all. This "bumblebee" has only one pair of wings, and upon closer inspection the head and legs also look wrong for a bee. This insect is actually a predacious bee-like robber fly belonging to the genus Laphria. In fact this species is Laphria thoracica; the field marks are the yellow hair around the wings and the orange on the legs.
One wonders which pressures of natural selection produced such a faithful reproduction of a bee. Is this the Batesian mimicry also employed by many defenceless nectar sippers, intended to dissuade hungry birds looking for lunch? Or the stealth camouflage of a lurk and pounce hunter, evolved to allow the fly to get close to its prey?
Sure enough, it wasn't long until the fly got its dinner. Robber flies will eat whatever insects they can capture and overpower, including one another, but this is the first time I have seen one actually capture and consume a bee.


Male robber flies are shorter and less robust than the females. This one got trapped in a friend's window ... and of course fooled her into thinking he was a bee. After being photographed he was shown the door and sent on his way.
Another male observed at the same locale as the female.


These are not wasps in the next three pictures, they are flies, Thick-headed Flies or Conopid Flies of the genus Physocephala, probably Physocephala tibialis. Despite its fearsome needle-like proboscis the adult is actually a defenceless nectar drinker. The larvae, on the other hand, are internal parasites of bees and wasps. Should a bee pass by the female fly will alight on it, lay its eggs, and the fly larve will hatch and ... you know the rest of the story.



Again, is the purpose of this near perfect mimicry to avoid predation? Or to lower the suspicion of a potential host? Both? Here's a photo of the real thing, a Potter Wasp.
Monday, August 11, 2008
A walk among the gardens of the Tweed Heritage Center and along "the Trail" ...
Most molluscs are found in the water but some species, such as this colorful land snail (Cepaea sp.) and the common garden slug, are terrestrial.
This Pennsylvania Leatherwing (Chauliognathus pensylvanicus) has a hitchhiker, a parasitic mite.

Potter Wasp (Eumenes fraternus)

Sand Wasp (genus Bicyrtes, or Bembix ???) ... awesome translucent green eyes on these insects

Honeybee (Apis mellifera)

The insect above is NOT a bee ... many species of of flies, such as this Drone Fly (Eristalis sp.), mimic bees as a defense against predation. Compare the hoverfly's physical attributes to the bees and wasps above, and the common Greenbottle Fly (Lucilia sericata) below. Flies (order Diptera) only have two wings, members of the order Hymenoptera such as ants, bees, wasps have four.

Death lurks among the flowers; Ambush Bugs (Phymata pennsylvanica) await the unwary. These bugs (order Hemiptera ... true bugs) blend in with a wide variety of blossoms.




Flower Spiders (a.k.a. Crab Spider ... Misumena sp.) can change their coloration to match their background. Their venom is specifically potent to bees and flies. These spiders have good vision for movemant and this specimen was clearly aware of my presence.


Like most spiders the Long Jawed Orb Weaver (Tetragnatha sp.) snares its prey with a web.

The Halloween Pennant (Celithemis eponina) takes a more proactive approach and hunts its dinner. This species of dragonfly is a relatively weak flier.


















