White larva of  a parasitic wasp, <i>Cotesia (=Apanteles) medicaginis,</i> dissected out of an alfalfa caterpillar, <i>Colias eurytheme.</i>.
White larva of a parasitic wasp, Cotesia (=Apanteles) medicaginis, dissected out of an alfalfa caterpillar, Colias eurytheme..
Credit: Jack Kelly Clark