EGG.—Long, narrow, fusiform, thickest in the middle, tapering about equally to either end ; the two ends nearly equal, small, blunt, the upper one rounded ; the sides marked by many low, narrow, longitudinal ribs, about 30 in number ; in shape much resembles egg of Colias Philodice, but the ribs are more numerous and less prominent, and there are no cross striæ. Color, when first laid, greenish-yellow; after a few hours turning to red. Duration of this stage in midsummer 2 to 3 days.