Identity Crisis

I have no idea how one knows whether this little chap is a grasshopper or a cricket. There were bloody loads of them in this field, walking through the grass they were hopping about everywhere. This obliging example kindly stayed still long enough for me to get a shot at him. Isn't he fine?

Minolta Dimage A2
Shutter - 1/250
Aperture - f7.1
Focal Length - 50.80mm
ISO Speed - 64