VIENNA — An autistic boy who was reported missing this afternoon by his father was found tonight by a pilot for the Maine Warden’s Service, nearly three hours after he disappeared.

Deborah Turcotte, a spokeswoman for the Maine Department of Inland Fisheries and Wildlife, said the boy, three-year-old Benjamin Lehr of Vienna, was spotted standing in a field of tall grass several hundred yards behind his home.

His father, Jonathan K. Kehr reported his son missing around 2 p.m.

A massive ground search was launched by the warden’s service, Maine State Police, and several local agencies, but it was the sharp eyes of warden’s service pilot Dan Dufault, who spotted the boy in the field.

Turcotte said Dufault was able to see the child because the boy had removed the top part of his camouflage pajamas.

The boy was in good condition.