GENUS. THECLA, _Fabr._ Polyommatus p. _Latr. & God._ Hesperia p. _Fabr. olim._ Papilio (Pleb. ruric.) _Linn. Drury._ THECLA SYLVANUS. Alis suprà maris obscurè violaceis, feminæ albido coerulescentibus; subtus fuscis, annulis numerosis albis seu albidis; posticis ocellis duobus anguli ani argenteis rufo cinctis. (Expans. Alar. 1 unc. 3 lin.) SYN. Papilio (Pleb. rur.) Sylvanus, _Drury_, _App. vol._ 2. Pap. Larydas, _Cramer_, _pl._ 282. _fig._ H. _Herbst. tab._ 290. _f._ 1. _Latr. & God. Enc. Méth._ ix. 619. (Polyommatus Larydas.) HABITAT: Sierra Leone. _Upper Side._ Head, thorax, and abdomen black. Wings of a dark mazarine blue, tinged with brown; immaculate. Posterior wings with three small narrow tails to each, which appear to be clusters of small hairs, extending from the wing below the cilia. _Under Side._ Palpi, breast, and thighs grey. Wings russet or hair-coloured. Anterior near the tips with a few faint markings. Posterior wings irregularly spotted with black, dark brown, and whitish {6}spots and marks; two black ones being situated next the abdominal corners, and sparkling with small sapphire-coloured specks placed thereon, being scarcely discernible. All the wings are entire. POLYOMMATUS ISIS. Plate III. fig. 4, 5. ORDER: Lepidoptera. SECTION: Diurna. FAMILY: Lycænidæ, _Leach_. GENUS. POLYOMMATUS, _Latr. & God._ Hesperia (rur.), _Fabr._ Argus p. _Scop._ POLYOMMATUS ISIS. Alis supra violaceo-coerulescentibus, disco anticarum maculâ, posticarum fasciâ albis; subtus albis; posticis fasciis duabus repandis, et macularum serie nigris, harum duabus internis argentatis [male]. (Expans. Alar. 1 unc. 3 lin.) SYN. Papilio (Dan. Festiv.) Isis, _Drury_, _App. vol._ 1. Hesperia Isarchus, _Fabr. Ent. Syst._ III. 1. _p._ 316. 198. _Herbst. Pap._ 320. _f._ 8, 9. _Enc. Méth._ ix. _p._ 679. _No._ 194. (Pol. Isarchus.) Papilio Camillus, _Cramer_, _pl._ 300. _fig._ A. B. HABITAT: Sierra Leone (_Drury_). "America, Dom. Drury" (_Fabricius_). Timor (_Enc. Méth._). _Upper Side._ Head, black. Thorax and abdomen dark blue. Anterior wings fine violet, a little inclining to purple; round the external edge runs a small narrow black line. Cilia white and black. On the middle of these wings is a white patch, with two small faint dark spots on its upper side. Posterior wings violet-coloured, with the same narrow black line running along the external edges as on the anterior. An irregular white bar crosses these wings from the anterior to the abdominal edges, beginning near the upper corner and ending near the extremity of the body.