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Mottled Tortoise Beetle

Posted on October 24, 2010 by Troy Bartlett

October 10, 2010 | Twelvestones, Roswell, GA, USA

A few weeks ago I found this tortoise beetle, Deloyala guttata, on the underside of a sycamore leaf in a nearby park. Most of the time you only see tortoise beetles safely tucked away inside their “shell” (hence their name). I waited for this one to start moving around so I could get this shot.

Posted in Featured Photos | 2 Comments

Identification Challenge #3

Posted on October 17, 2010 by Troy Bartlett

June 6, 2010 | Twelvestones, Roswell, GA, USA

I believe I’ve identified this to genus. Can you do the same?

Posted in Identification Challenges | 3 Comments

Identification Challenge #2 Reveal

Posted on October 16, 2010 by Troy Bartlett

What was this?

September 5, 2010 | Twelvestones, Roswell, GA, USA

As revealed in the comments, it is the rear end of a saddleback caterpillar, Sibine stimulea.

I neglected to take a good dorsolateral shot, but here’s a couple more shots of this individual.

More complete view

Front view -- head is tucked underneath

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Globular Stink Bug Invasive

Posted on September 26, 2010 by Troy Bartlett

This post’s featured creature is Megacopta Cribraria.

August 5, 2010 | Twelvestones, Roswell, GA, USA | ~5mm

Just outside the entrance to my subdivision, there’s a stand of kudzu, Pueraria montana var. lobata, at the border of a city park. If you’re not familiar with kudzu, it’s a major invasive here in the Southeast that pretty much takes over wherever it manages to take root. Many of the volunteer outings with the local nature conservancy are focused on eliminating this invasive from conservancy lands. Here are a few photos of the area to give you an idea. read more

Posted in Featured Creatures | 7 Comments

Late Summer Luna Moth

Posted on September 14, 2010 by Troy Bartlett

Twelvestones, Roswell, GA, USA | August 22, 2010

I spotted this luna moth while returning from a walk in a nearby park. It was at the base of some landscape timbers, maybe having just eclosed. I coaxed it onto a finger and brought it home. I picked these grass blades as a perch and took a variety of photos.

After dark I found a spot where I could get the nearly full moon in the photo. There’s no way to get both the moth and the moon in focus at the same time, so I simply took one photo with the moon in focus and another with the moth in focus, and then combined them digitally. read more

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Patterns in Beech Leaves

Posted on September 12, 2010 by Troy Bartlett

Looking up from a forest trail at a nearby nature center, I saw the leaves of a beech tree backlit by the afternoon sun. I picked off a few of the interesting ones and held them by hand so as to take some closeups. I find the patterns interesting in the same way ink blots are interesting.

What do you see in these abstract images?

Flames? | Twelvestones, Roswell, GA, USA | September 5, 2010

Mandelbrot Fractal Set?

Stained glass window?

Leaf within a leaf?

What do you see?

Can anyone explain what’s going on here? Is this how leaves start to turn in the fall? A disease of some sort?

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Dagger Fly with Prey

Posted on September 11, 2010 by Troy Bartlett

Awhile back, Alex Wild posted some shots of dagger flies. I commented at the time that I had recently seen and photographed the flies, but didn’t know what they were. Thanks, Alex, for saving me the effort of figuring out what I photographed here.

May 22, 2010 | Twelvestones, Roswell, GA, USA

I can’t make out what it has captured, a beetle maybe?

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Identification Challenge #2

Posted on September 9, 2010 by Troy Bartlett

September 5, 2010 | Twelvestones, Roswell, GA, USA

Can you make heads or tails of this (that’s a hint)? Leave a comment with your guess.

Posted in Identification Challenges | 3 Comments

Identification Challenge #1 Reveal

Posted on September 8, 2010 by Troy Bartlett

Maybe I made the first identification challenge too hard. No one even ventured a guess in the comments in the two months since I posted it. Here’s the image again:

May 23, 2010 | Twelvestones, Roswell, GA, USA | ~10mm

Here’s another view that might make it a bit easier.

This is the egg mass of an eastern tent caterpillar. Next spring, I should see the distinctive webbing on the cherry tree in my backyard where I found this. There’s hundreds of eggs here, but last time I checked it, it was looking a bit worse for wear. The varnish so clearly visible here has worn and chunks of the mass are missing. Perhaps some eggs were parasitized and the parasites have since exited. read more

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Resigned Parasitized Caterpillar

Posted on September 8, 2010 by Troy Bartlett

September 5, 2010 | Twelvestones, Roswell, GA, USA

This caterpillar from a nearby park with head held low seems resigned to its fate as a parasitoid host. OK, I know that’s a normal position — allow me to anthropomorphise a bit.

You can see some white eggs on its back. I assume a tachinid fly left those, placing them close enough to the head that they couldn’t be removed.

In this next image, you can see there are also some already hatched eggs, sealing this little guy’s doom.

Closeup showing hatched eggs

I know tachinid fly larvae have breathing tubes that pierce the host’s skin. Could those long fibers amongst the eggs be those breathing tubes? I wouldn’t think they would be so long. I’m more inclined to think those are just bits of debris that maybe got stuck to whatever holds the eggs in place. read more

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