This is a female Orange. Here are some points that help (none is itself good enough, but together they paint a fairly clear picture). The dark band shows through from above on the front wing and is wide (follow the veins out from the dark eye spot on the front wing and the band takes up more than half the distance to the margin - it's usually just a bit narrower in males, but much narrower in C. philodice). That same dark eye spot on the front wing is clear white in the center and rather large and rounded (usually narrower and less often pale-centered in C. philodice). There is an orange flush, especially on the front wing (rare in C. philodice. The overall coloring underneith is "clean" looking, without a dusting of dark scales. The wings are rather more angular in shape (a bit concave on both the front and outer margins of the front wing). C. eurytheme average larger (hard to see in a photo, and sometimes doesn't help, because size varies). And, so on.

Of course that's just comparing C. philodice and C. eurytheme. Both usually can be told from other species by the usually prominent bold borders above in both males and females; the spot in the middle of the hind wing usually (at least partially) double-ringed and with a satellite; and with the dark row of spots inside the ege of the wings below usually well-developed. Both common in rural and urban areas where other species rarely wander.

http://bugguide.net/node/view/123389