_Upper Side._ Antennæ, head, thorax, and abdomen black. Wings black, at the base surrounded by a white band, separating it from the external part, which is black likewise. On the anterior wings, near the tips, are four small white spots, the two uppermost being largest; along the external edges is a narrow marginal row of small blue crescents, continued along the posterior wings, where it is double, having above it a row of brown orange spots, verged at top with blue. A white bar begins on the middle of the anterior edges of the anterior wings, which, crossing them and the posterior, ends at the extremity of the body. _Under Side._ Palpi, head, breast, and legs brown. The parts that on the upper side are black, are of a fine red brown. The basal parts having some brown orange spots on both wings, verged with black. Margins blue; scollopings edged with white. Margins of the wings dentated; the inferior ones most. Mr. Say observes of this beautiful species that it occurred sparingly in the Northwestern territory, during the advance of Major Long's expedition toward Lake Winnepec. He also found it at that lake as well as at the Lake of the Woods, and in other parts of Upper Canada. He procured specimens likewise from Arkansaw, in the expedition to the Rocky Mountains, and received it from Cambridge (Massachusetts). PIERIS EUCHARIS. Plate X. fig. 5, 6. ORDER: Lepidoptera. SECTION: Diurna. FAMILY: Papilionidæ, _Leach_. GENUS. PIERIS, _Schrank. Latr. God. Boisduval_. Pontia p. _Ochs._ Papilio (Dan. Cand. or Heliconii), _Linn._ _Drury, &c._ PIERIS EUCHARIS. Alis suboblongis integerrimis, supra albis, omnibus utrinque venis limboque nigris: posticis subtùs flavis, maculis marginalibus coccineis alboque cinctis. (Expans. Alar. 3 unc. 2 lin.) SYN. Papilio (Dan. Cand.) Eucharis, _Drury, App. vol._ 2. _Cramer, pl._ 201. B. C. [male]. 202. C. [female]. Papilio (D.C.) Hyparete, _Fabr. Ent. Syst._ III. 1. _p._ 176. (Exclus. Syn. _Linn._) Pieris Epicharis, _God. Enc. Méth_. ix. _p._ 153. _No._ 122. _Boisd. Hist. N. Lepid._ 1. _p._ 456. HABITAT: Bombay. _Upper Side._ Antennæ black. Head grey. Thorax and abdomen grey. Anterior wings white: nerves black, with seven white oblong spots placed along the external edges and tips on a black ground. Posterior wings cream-coloured, with six oval flesh-coloured spots placed along the posterior margin on a black ground, separated by the black nerves. {20}_Under Side._ Palpi, breast, and abdomen grey. Anterior wings white, with very broad and black nerves, forming white oblong spots on the upper side. Posterior wings yellow, with a broad black margin along the external edges, whereon are placed six oval scarlet spots, edged or surrounded with white. Nerves black and broad. Margins of the wings entire.