_Butterfly._--Head large, the antennæ moderately long, with the club flattened; the tip of the abdomen does not extend beyond the inner margin of the hind wings; the cell of the hind wings is open; the primaries are elongated, nearly twice as long as broad, with the exterior margin excavated; the secondaries at the outer margin denticulate. The prevalent color of the upper side of the wings is fulvous, adorned with black spots and lines, the under side of the wings paler brown, in some of the species laved with pink and brilliantly adorned with large silvery spots, as in the genus _Argynnis_. _Egg._--Conoidal, truncated on top, with fourteen ribs running from the apex to the base, between which are rows of elevated striæ, causing the surface to appear to be covered with quadrangular pits. _Larva._--The caterpillar is cylindrical in its mature stage, tapering a little from the middle toward the head, which is somewhat smaller than the body. The head and each segment of the body are adorned with branching spines. [Illustration FIG. 87.--Neuration of the genus _Dione_.] _Chrysalis._--The chrysalis is suspended, and has on the dorsal surface of the abdomen a number of small projections. At the point where the abdominal and thoracic segments unite on the dorsal side there is a deep depression, succeeded on the middle of the thorax by a rounded elevation composed of the wing-cases. At the vertex of the chrysalis there is a conical projection; on the ventral side the chrysalis is bowed outwardly. This genus is confined to the New World, and contains five species. It is closely related to the genus _Coloenis_ on the one hand and to the genus _Argynnis_ on the other. It is distinguished from _Coloenis_ by the more robust structure of the palpi, which closely approximate in form the palpi of the genus _Argynnis_. It is distinguished from the species of the genus _Argynnis_ by the form of the wings and by the open cell of the secondaries. The larva feeds upon the different species of the genus _Passiflora_. I cannot at all agree with those who have recently classed this butterfly with the Heliconians. In spite of certain resemblances in the early stages between the insect we are considering and the early stages of some of the Heliconians, and in spite of the shape of the wings, which are remarkably elongated, there are structural peculiarities enough to compel us to keep this insect in the ranks of the Nymphalinæ, where it has been placed for sixty years by very competent and critical observers. In a popular work like this it manifestly is out of place to enter into a lengthy discussion of a question of this character, but it seems proper to call attention to the fact that in the judgment of the writer the location of this genus in the preceding subfamily does violence to obvious anatomical facts. (1) =Dione vanillæ=, Linnæus, Plate VIII, Fig. 7, ♂ (The Gulf Fritillary).