Two last instar larvae of the Euchloe olympia (left) and Euchloe ausonides (right).  The differences in ~three-day old fifth instar larvae of the two taxa are subtle; but can be noted in the height of the gray region separating the lateral stripe from the mid-dorsum. In E. olympia, the height of this region is greater. Also, the hue of yellow stripe above this region is much brigher in E. ausonides as compared to E. olympia.