Notwithstanding the very decisive character which this species of Humming-Bird displays, and which considered individually can leave us little reason to distrust its identity as a species, we are not to overlook the very near approximation of this kind with some others that are described as specifically different, such as the Sapphire Humming-Bird, and that distinguished by the appellation of the Sapphire and Emerald Humming-Bird. The near approach of these and some others to the species now before us appears to be sufficiently obvious to induce a persuasion that in a less mature state one kind may sometimes have been mistaken for another, and this becomes the more probable when we recollect that the Humming-Birds in general, like many of the larger tribes of the feathered race, do not arrive at their full perfection of plumage till the second and more commonly till the third year. ------------------------------------------------------------------------ [Illustration: _6_ _London. Published as the Act directs by E. Donovan & Mess.^{rs} Simpkin & Marshall, May 1, 1822._ ] ------------------------------------------------------------------------ ENTOMOLOGY. PLATE VI. FIGURE I, I. PAPILIO MARCELLINA. MARCELLINA’S BUTTERFLY. ORDER LEPIDOPTERA. GENERIC CHARACTER. Antennæ thicker towards the tip and generally terminating in a knob: wings erect when at rest. Fly by day. * DANAI CAND. SPECIFIC CHARACTER AND SYNONYMS. Wings entire, rounded, yellow, each of them beneath with a geminous or double silver spot. PAPILIO MARCELLINA: alis integris rotundatis flavis: singalis subtus puncto gemino argenteo.—_Fabr. Spec. Ins. 2. 49. n. 214._—_Ent. Syst. t. 3. p. 1. 209. 654._—_Cram. 14. t. 165._ * * * * *