How to catch an escaped corn snake: (from here)
"Lay some sound traps along the walls. The crinkly-sound-making plastic bags from the grocery store are great. Kind of crumple them up and put them on the floor, at least one on each exposed wall. Do the same in any nooks and crannies (spaces between furniture and walls, for example). About 9-10 PM, when it is completely dark, turn off all the lights, turn off the TV, stereo, make it as quiet as possible. Then, with a flashlight turned off but close at hand, just sit. And listen. Give it a half hour or so for the snake to become convinced that it's safe to move. Once it hits one of the bags (or any other crinkly or other noise making sound traps you've put out), you'll hear it. It is just a matter of figuring out where the noise came from, getting over there quickly without causing a great deal of vibrations through the floor (you don't want to overly alert them to your coming), get that flashlight on, and nail 'em.
That doesn't work? Too tired to keep it up all night? No problem. Before retiring for the evening, lay about an inch-wide strip of flour or cornstarch across the doorways. The next morning, if the snake moved through any of the doorways, you will see the trail for a short distance pointing in the direction they were headed. This, if nothing else, should help you narrow down the field of search.
If the sound and flour don't work, you can also put a nice warm mouse (dead is fine, you can buy them frozen in pet shops) in an empty liter soda bottle. Poke a few holes in it to let as much odor out as possible. Place it someplace on the warm side (again, get those odors out there), disappear yourself, and wait. The snake may come out for a snack, and stay (the black bottoms of some of the bottles makes a nice cave-y feeling place) after its eaten."
A safe way to transport the snake is in a pillowcase. You might want to enlist the help of someone who isn't phobic, though 