_Dog's-head Butterfly_ (_Zerene caesonia_, _Colias caesonia_ or _Meganostoma caesonia_). Expanse 2 1/4 inches. Upper surface yellow with black inner and outer borders on front wings and black outer border on hind wings. The black and yellow of each front wing so combined as to make a distinct dog's head with black eye. _Clouded Sulphur_ (_Eurymus philodice_ or _Colias philodice_). Expanse 2 inches. Upper surface sulphur yellow with blackish borders, the yellow brighter in the male than in the female. Male with line between yellow and black distinct, a black spot just in front of the middle of each front wing and an orange spot near the middle of each hind wing. Under surface of male deeper yellow, with spots as on the upper surface but without black margin, and with a row of sub-marginal brownish dots on each wing. Female with upper surface more generally suffused between marginal mark and the yellow part with more or less duskiness both above and below. Spots on each wing much as in male. In the white form of the female (_pallidice_) the yellow is replaced by white. _Pink-edged Sulphur_ (_Eurymus interior_). At once distinguishable from _philodice_ by the narrow pink edge of all the wings, showing both from above and from below, slightly smaller as a rule. _Orange Sulphur_ (_Eurymus eurytheme_ or _Colias eurytheme_). Expanse 2 1/4 inches. Much like Clouded Sulphur in markings except that prevailing color-tone is orange yellow. _Black-bordered Sulphur_ (_Eurema nicippe_, _Xanthidia nicippe_ or _Terias nicippe_). Expanse 2 inches. Upper surface of wings bright orange with a small black dash in front of the middle of each front wing and a broad black border on all the wings. In the females the borders are interrupted at the rear. Under surface slightly brownish yellow, minutely striated and clouded when exposed when the butterfly alights. _Little Sulphur_ (_Eurema euterpe_, _Eurema lisa_, _Xanthidia lisa_ or _Terias lisa_). Expanse 1 inch. Easily known by its small size and delicate structure. Upper surface of wings yellow with distinct black borders. Under surface yellow with indistinct spots. _Dainty Sulphur_ (_Nathalis iole_). Expanse 1 inch. Easily known by its small size and narrow yellow wings with black bars across the outer angles and black bands across the back border of the front wings and the front border of the hind wings. THE NYMPHS FAMILY _Nymphalidae_ A large proportion of our most familiar butterflies belongs to this family. The Fritillaries, the Angle-wings, the Sovereigns, and the Emperors are tribes in which practically all the species are of medium or large size. The Crescent-spots include a few which are rather small.