Ken, how are you distinguishing this guy from terminalis? I was thinking that the shape of the tibiae could be used, maybe?

The tibial extensions are more parallel sided and extend the entire length of the tibiae; those of A. terminalis are shorter and have a slightly different shape.

I think I'm getting it. The tibial extensions "extend the entire length of the tibiae" helps! Thank you, Ken!

Some of the specimens in the Guide are ambiguous. Take, for instance, the one below. The extensions are shaped more like those of terminalis, but they also appear to extend the length of the tibiae, like those of thomasi. Go figure. :)

Ken,
Do you think the first two images in this series are the same species as the last three images? The Acanthocephala that I've reared lay their eggs individually and nymphs are pale for the first day and then turn dark. The author indicates that the hatchlings and nymphs were photographed three days apart, but the nymphs here appear to be fourth instar.

I suspect they are different genera, and I've left a comment to that effect on the post. If the contributor responds, perhaps we can separate the two. If not, at least our doubt will be clear to others who view the post.

I should have said third-instar nymphs in the first two images of the Acanthocephala and fourth-instar for the last image. For the initial two images -- the nymphs to me look Leptoglossusish, but the eggs, while aligned, appear to the wrong shape. What did you think of those, Ken?
(At any rate, the two different genera should probably be unlinked, imo, because it's a bit misleading. I was digging through Acanthocephala terminalis images as I prepare to write a little article on rearing.)

...I think I'm seeing a dilated third antennomere. Those could be the nymphs (and eggs) of Euthochtha galeator:



I'll give the original contributor a couple of days to respond to my question before separating the two sets of images.

I'd never heard of that one -- very cool!
I can't find images of their eggs except for this contributor's (unidentified) guess:


Edit: oh, and this.

I didn't think A. thomasi even occurred in my area so I had never bothered to learn the differences. Thank you for the tips.