Male summer form is dull red with a barely hooked forewing tip, and a short tail on the hindwing. Male winter form is redder with more dark markings, a definitely hooked forewing tip, and a longer tail than the summer form. Both female forms are lighter red and have an irregular yellow submarginal band. The winter female form has hooked forewing tips. Males perch in clearings or on ridgetops to wait for females.
Adults hibernate, then mate in the spring.
G5 - Demonstrably secure globally, though it may be quite rare in parts of its range, especially at the periphery. Opler, P. A. and G. O. Krizek. Butterflies east of the Great Plains. Johns Hopkins University Press, Baltimore. Opler, P. A. and V. Malikul.