There are some very large species of scarab in several of the subfamilies. Some of the largest insects in the world are in the genus Megasoma and Goliathus and a few other genera. Some exceed 100 grams and would be a heck of thing to hit while driving a car, let alone on a motorcycle.In the 60s and 70s there were thousands of them every year, they were a danger to motorcyclists, it felt like getting shot. They started disappearing in the 80s, that's the first big one I've seen for about 30 years. Not sure why but I guess land clearing is the main problem and maybe pesticides.