David Whittemore's Two Hundred Fifty Pixels Wide : Western Tiger Swallowtail

For a few years now, I'd notice the occasional butterfly passing through the area - bopping along in the park next door, or in the backyard. I finally had the opportunity to take a picture and identify what the species is. Here's a fairly beat up Western Tiger Swallowtail. He's lost the ends of his tails and the tip of his left wing, and is resting on the flowering Potato Vine in the back yard.

The guide I found says that their "flight time" is in June and July, so he's a couple months early.