It has now become a routine for me to donate blood to at least one tick every year. Last year I returned from Illinois with a lone star tick attached to my leg. The year before, a tick and I enjoyed a Neil Young concert together.
I found this year's first tick on my arm last night 2 days after my last field trip, which was a successful search for the snail Cepaea nemoralis on Sunday. I got the tick either then or on Saturday when I was searching for slugs in the woods. Here it is on my arm still in the process of gorging itself on my hemoglobin.
My wife, who is an expert tick remover thanks to the frequent training opportunities I have provided for her over the years, quickly got it off. And here is a close-up of the beast.
It was ~1.5 mm long. I am assuming it is a nymph of a deer tick (Ixodes scapularis). I have posted a larger photo on BugGuide.net. Maybe I'll get a more definite identification from there.
Meanwhile, I still have an itchy, red swelling on my arm where the tick was.