1. Temper Hyperactivity
The ants in his pants may not be a sign of ADHD, but rather Asperger's. A child with Asperger syndrome may feel stressed and anxious in new situations, which can lead to trouble relaxing or sitting still.
If possible, give your child advance notice of what to expect in new situations. ("We're visiting Aunt Susan today. She just moved to an apartment in the city, which will be very different from the house in the suburbs where she used to live.")