Hiking in the woods, you keep swatting at the irritating mosquitoes that land on your face. later, you're surprised to discover a number of itchy mosquito bites on your legs. the reason you noticed the mosquitoes landing on your face but did not notice the mosquitoes landing on your legs is probably because:

The reason you noticed the mosquitoes landing on your face but did not notice the mosquitoes landing on your legs is probably because there are more sensory receptors in your facial skin than in the skin on the backs of your legs. The skin's touch receptors aren't evenly distributed. Some areas have more sensory receptors (face) than other (legs for example).