_Under Side._ Palpi very small, hairy, and white. Thorax, legs and abdomen white. Wings pale red-brown, having a shade of darker colour running along their external edges, and on the anterior ones are placed two faint-coloured streaks, running from the external edges towards the middle of the wings. Margins of the wings angulated and dentated. CASTNIA THAIS. Plate XVI. fig. 4. ORDER: Lepidoptera. SECTION: ----? (hesperi-sphinges, _Latr._) FAMILY: Castniidæ. GENUS. CASTNIA, _Fabr. Latr. God. Dalm._ Papilio (Dan. Festiv.), _Drury_. CASTNIA THAIS. Alis anticis supra fusco-viridibus, nitidis, basi fasciisque duabus carneo-griseis; posticis rubris fasciis duabus margineque nigris. (Expans. Alar. 2 unc. 6 lin.) SYN. Papilio (Dan. Festiv.) Thais, _Drury_, _App. vol._ 3. Castnia Thalaira, _Latr. God. Enc. Méth._ ix. _p._ 800. _No._ 14. HABITAT: Brazil. _Upper Side._ Antennæ brown. Thorax, abdomen, and anterior wings red-brown; the latter having two streaks or bars of a lighter colour crossing them from the anterior edges to the posterior and external ones; one crossing the middle of the wing, the other nearer the tips. Posterior wings orange; the lower part black along the external edge, whereon are placed a row of square orange-coloured {23}spots, those next the upper corners reaching to the edge; a black line also crosses these wings, beginning just below the body, and running almost across to the upper corner. _Under Side._ Palpi and thorax red-brown. Abdomen yellowish. Anterior wings yellowish clay-coloured, with three black lines crossing them transversely, the middle one being the broadest. Posterior wings orange-brown, with a small white spot placed near the centre. Margins of the wings plain. PLATE XVII. [Illustration] HESPERIA OPHION. Plate XVII. fig. 1, 2. ORDER: Lepidoptera. SECTION: Diurna. FAMILY: Hesperiidæ, _Steph._ GENUS. HESPERIA, _Fabr. Latr._ Erinnys P. _Schr._ Papilio (Pleb. Urb.), _Drury_. HESPERIA OPHION. Alis fuscantibus, anticis utrinque punctis quinque discoidalibus alterisque tribus subapicalibus albis; posticis subtùs albis margine antico nigro 3-maculato serieque punctorum submarginalium. (Expans. Alar. 1 unc. 10 lin.) SYN. Papilio (Pleb. Urb.) Ophion, _Drury_, _App. vol._ 3. _Stoll Suppl. Cram._ _pl._ 26. _f._ 4. HABITAT: Sierra Leone. _Upper Side._ Antennæ black. Head with five small white spots. Thorax, abdomen, and wings dark greyish brown; anterior wings having a cluster of five small oval transparent white spots placed near the middle of the wings, and three very small round spots of the same kind nearer the tips. Several faint dark spots are also dispersed on these and the inferior wings.