Donuel,

The blue butterfly, the swallowtail, and the wolf spider are all native to Maryland, at least in the Baltimore area where I used to live.
If you've found a real Scarab beatle it would be worth some coin to any bug collector. I would be a little skeptical unless the bug was a lot larger than our usual June bugs which look the same.
The Tiger mosquitos are indeed an import, I believe from Southeast Asia.
In this area we have an infestation of green assassin bugs and I can tell you they have a nasty bite.
Every so often I see very large (1 to 1.5 inch in length)ant like insects that are covered with a scarlet hair and have at least one stripe around their abdomen. I haven't been able to actually identify them yet. I always see only one of them, not a swarm.