_Butterfly._--Easily distinguished from all other species in our fauna by the pointed hind wings, margined on the outer border with black, and by the heavy black border of the fore wings, deeply excised inwardly, recalling the fore wing of the species of the genus _Meganostoma_. Expanse, ♂, 1.75 inch; ♀, 1.85 inch. _Early Stages._--We do not, as yet, know much about these. _T. mexicana_ is very common in Arizona, and occurs also in Texas. It is abundant in Mexico. (5) =Terias damaris=, Felder, Plate XXXVII, Fig. 9, ♂; Fig. 10, ♂, _under side_ (Damaris). _Butterfly._--Allied to the preceding species, but readily distinguished from it by the less deeply excised outer border of the fore wing, by the fact that the black outer margin of the secondaries extends inwardly beyond the angulated point of the wing, and by the different color and style of the markings of the lower side. Expanse, 1.35-1.65 inch. _Early Stages._--Unknown. _Damaris_ occurs in Arizona, and thence ranges south into Venezuela. (6) =Terias westwoodi.= Boisduval, Plate XXXVII, Fig. 11, ♂ (Westwood's Yellow). _Butterfly._--Pale yellow or orange-yellow, with a narrow black border on the fore wings, beginning on the costa beyond the middle, and not quite reaching the inner angle. On the under side the wings are pale yellow, immaculate, or at the apex of the fore wing and the outer angle of the hind wing broadly marked with very pale reddish-brown. Expanse, 1.75-2.00 inches. _Early Stages._--Unknown. Westwood's Yellow occurs in Texas and Arizona, but is not common. It is abundant farther south. (7) =Terias lisa=, Boisduval and Leconte, Plate XXXVII, Fig. 13, ♂; Plate II, Fig. 3, _larva_; Plate V, Fig. 56, _chrysalis_ (The Little Sulphur). _Butterfly._--Allied to the three following species, from which it may at once be distinguished by the absence of the black bar on the inner margin of the fore wings and by the profusely mottled surface of the under side of the hind wings. It is subject to considerable variation, albino females and melanic males being sometimes found, as well as dwarfed specimens of very small size. Expanse, 1.25-1.60 inch. _Early Stages._--These have not been thoroughly studied and described, in spite of the fact that the insect is very common in many easily accessible localities. The caterpillar feeds on _Cassia_ and on clover. _T. lisa_ ranges from New England south and west as far as the foot-hills of the Rocky Mountains, and into Mexico and Honduras. It is found in the Antilles and Bermuda. An interesting account of the appearance of a vast swarm of these butterflies in the Bermudas is given by Jones in "Psyche," vol. i, p. 121: