This is one of the Tachinid Flies, family Tachinidae. The second largest fly family, there are 1,350 species in North America. Here is a link to the pdf checklist of North America. Four subfamilies are listed: Dexiinae, Exoristinae, Phasiinae and Tachininae. Most of these guys are restricted to particular hosts. Many attack caterpillars of the butterfly and sawfly species but some attack beetle larvae.  Eggs are laid directly on the host or on plants that are inhabited by the host. The tachinid larvae feed internally. The hosts almost invariably die. I have found the adults on flowers before and I have seen a long-legged darker species similar to this one. This guy (or gal) flew into my car and landed on my net handle. Insects seem highly attracted to my net handle. Hard to say. Perhaps my aroma?

In fall this yellow-rumped species which is likely in the genus Epalpus shows itself and frisks the flowers.

This is another Epalpus or the same species in early summer from Indian creek area. This is a big bulky fly. Hulking you might say. Loud buzz.

The, well, shining, spiny ass end of the same fly. Yikes.

One of the Tachinids with a comb on the hindleg (comb-footed flies). Very nice animals. Don't have the species specifics yet. There is a similar black species that flies in the fall. Elusive so far.

Visible combs here as well with slightly different red distribution. One needs a book on the Tachs alone. This comb looks heavier than the above.

Appeared to have the Syrphid cross vein but alas I was misinformed by my eye. A fly man beyond my capabilities believes this is a Tachinid in the Phasiinae subfamily. Very dark species and very striking for a fly don't you think? And though it appears to have two extra wings, I believe that is due to fly sex. The underlying partner is mostly obscured.

No combs on the leg. Sort of looks like a cross between the above two flies. Same facial structure. Really nice flies though. I could believe this was the female to the fly two shots up.

No fly has impressed me more than this one recently. A breath-stopping Tachinid fly which is likely in the genus Cylindromyia. It is a genus of about 20 or less in the US. They are in the Phasiinae. I think most are narrow-waisted. They are parasitoids as are all of the Tachs.

Also seems to be close enough to the waisted Tachinid above to be in the genus Cylindromyia.  But this is actually Cordyligaster septentrionalis. The only species in this genus in the east. Dark and shaded woodland for this one and it was very wary up on its leaftops like a robber.

A big Tach. Had its little area on the path and kept going there. Much larger than the fly just below though they were on the same trail on the same day. I am in the process of obtaining the US Tach catalog. We will see.

Smaller and purpler version. This one was a dervish on the leaf top. Spinning and running to the edges. Ruby red eyes.

Must be a relation of the above. These Tachinids seem to guard their leafy perches closely, I assume on the lookout for rivals and mates.

Very common in the horsetail area of Toadsuck.  Buzzing in several areas and landing up on leaf tops. Wide eyed and wary. Seems to be a common late summer fly in several areas.