A simple tally of bugs spotted is no fun at all. Now, on the other hand, if you assign two points for every white bug and three points for red bugs, it becomes quite the game. Of course, you have to assign penalties for false cries, and convertibles have to figure in there somehow. I'll let you in on my system. The Official Winn Rules For Bugs Red bugs are worth three points.
White bugs are worth two points.
Black bugs immediately set your score to zero. All other bugs are worth one point each. Convertibles are worth double, except for black ones. Rolls-Royce hooded bugs are worth double, too. Calling a bug that isn't there makes you lose the number of points that would normally be granted.