_Diana Fritillary_ (_Argynnis diana_). _Male._ Expanse 3 1/2 inches. Apex of fore wings rounded. Upper surface of all wings, with a little more than basal half, solid brownish black and the rest of the surface orange-brown, marked with darker brown round spots and vein lines. Under surface light buff, marked with black, with silver crescents and spots on hind wings. _Female._ Expanse 4 inches. Upper surface of all wings blackish with bluish or greenish iridescence, and marginal third marked with blue spots and stripes. These are more prominent on the hind wings. Under surface slaty brown with prominent silver crescents on the hind wings. _Idalia or Regal Fritillary_ (_Argynnis idalia_). _Male._ Expanse 3 inches. Front wings fulvous brown with black spots and markings. Hind wings black except at base with a row of fulvous brown sub-marginal spots and an inner row of whitish or bluish white spots. _Female._ Expanse 3 1/2 inches. Similar to male except for larger size and the fact that the two rows of spots on the hind wings are yellowish brown. _Great Spangled Fritillary_ (_Argynnis cybele_). Expanse 3 1/4 inches. General color of wings fulvous brown with black markings on upper surface and black and silver markings on under surface. The yellow band between the rows of silver spots on hind wings is broad. There is a distinct narrow fulvous stripe on the upper side of the hind wing just inside the outer margin, and a similar stripe along the margin of the front wing, more or less interrupted by the veins. _Silver-spot Fritillary_ (_Argynnis aphrodite_). Expanse 3 inches. Similar to the Great Spangled but a little smaller, and with the buff yellow band between the rows of silver spots on the lower surface much narrower and almost disappearing at the rear. _Mountain Silver-spot_ (_Argynnis atlantis_). Expanse 2 1/4 inches. Known by its smaller size and the black marginal border stripe on all the wings, with no brown line dividing this stripe. _Silver-bordered Fritillary_ (_Brenthis myrina_). Expanse 1 3/4 inches. Known by its small size and a marginal row of silver spots on the under side of each of the wings, and with many other silver spots scattered over the under surface of the hind wings. _Meadow Fritillary_ (_Brenthis bellona_). Expanse 2 inches. Easily known by the absence of silver spots on all the wings. The wings are long in proportion to their width. THE TRIBE OF THE CRESCENT-SPOTS The members of this tribe have the following combinations of characters: scaly antennae, with a short stout club some three times as long as broad, and a pair of slender palpi in which the terminal joint is only about half as long as the middle one. There may or may not be a slight ridge running lengthwise of the naked part of the antennal club.