The history of this splendid species of Tanager is unknown to Naturalists: we are aware only, that independently of the varieties arising from its different states of plumage, there are two pretty distinct and accurately defined varieties, one of which has the head of a fine green, the other of a rich blue. Some authors consider these two birds as specifically different, while others are as well assured they are the same. Dr. Latham observes that these birds are, without doubt, the same, differing only in sex, but which of them is the male is not ascertained. Some of the French writers, among whom is Vieillot, express a different opinion, for they assure us neither the female or the young are known, and they further add, that in the Brazils this bird is common, while in Guiana it is rare. Vieillot once regarded them as distinct species, but has subsequently described them as the same. Both birds, according to Dr. Latham, are from Cayenne; we have seen both kinds from the Brazils. The size of this bird is that of the house sparrow: the rump is usually green, but in the blue headed variety, is sometimes flavous, more or less inclined to orange. ------------------------------------------------------------------------ [Illustration: _24_ _London. Published as the Act directs, by E. Donovan & Mess.^{rs} Simpkin & Marshall, Nov.^r 1 1822._ ] ------------------------------------------------------------------------ ENTOMOLOGY. PLATE XXIV. PAPILIO THERSITES THERSITES BUTTERFLY. LEPIDOPTERA. GENERIC CHARACTER. Antennæ thicker towards the tip, and generally terminating in a knob: wings erect when at rest. Fly by day. SPECIFIC CHARACTER AND SYNONYMS. Wings tailed and yellow: border black: lower ones with yellow lunules. PAPILIO THERSITES: alis caudatis flavis: limbo nigro, posticis lunulis flavis. _Fabr. Ent. Syst. T. 3. p. 1. 88._ We may venture to affirm, with every degree of certainty, that there is no figure of this very beautiful species, extant, in the work of any previous author. Fabricius described it as a new species, under the name of Papilio Thersites; his description refers to a specimen in the cabinet of Dr. Hunter, but he has omitted to insert his usual reference to the drawings of Mr. Jones, among which that specimen was delineated, and from which we are well aware the Fabrician description of the species is derived. It is from those drawings, also, that we have been enabled to determine the species with perfect accuracy.