Insect blood is greenish, yellowish or colorless. Few insects have red blood. Human blood contains a red pigment called hemoglobin, which carries oxygen to the cells. Yes, after a hard days work, grasshoppers can smell really bad. The sense of smell is located chiefly in the antennae of insects.
Insects use smell to locate food and to find their way about and to locate places to lay their eggs.
Short-Horned grasshoppers have ears located on the sides for their body. Long-horned grasshoppers and crickets have ears located on their front legs.