Adult and larval chigger. Only the newly hatched larva is parasitic. After a blood meal the almost invisible larva leaves its host and becomes a predator of tiny arthropods in the soil. (Modified from Michener 1946)
scanned from Mallis Handbook of Pest Control, this is a commonly reproduced image. Probably originated in Michener 1946. Ann. ESA vol 39: 101-118