We suppose that the figure of the Hirondille longipennes, in the _Planches Coloriées_, (pl. 83), is intended to represent this species; if so, it is incorrect, both in drawing, proportion, colouring, and detail. * * * * * * [Illustration: EUDAMUS Pl.1. _1. Agesilaus. 2. Doryssus._] EUDAMUS Agesilaus. ---- Family Hesperidæ.--_Nob._ (_Anopluriform Stirps. Horsf._) GENERIC CHARACTER. Antennæ with the club unequally fusiform, the outer half abruptly bent, forming a lengthened, attenuated hook, alike in both sexes; anterior wings papilioniform: posterior wings with the caudal appendages very long and obtuse. Type.--_Hesperia Proteus._ Fab. ---- SPECIFIC CHARACTER. _Posterior wings dark brown, with a broad, entire, cream coloured margin; beneath marked with two darker bands, and a basal dot: appendages very long, whiteish._ ---- The insects composing this group, have only been discovered in the hot latitudes of America. In the _Systema Naturæ_ one species alone is recorded; Fabricius was acquainted with three; our own cabinet possesses eighteen, all collected in a comparatively insignificant portion of Brazil. Others have been figured by Drury and Cramer, so that the number of species already known, may probably amount to near thirty. The flight of these Swallow-tailed _Hesperidæ_, is usually performed in the morning and evening, and is so rapid, as frequently to elude the eye of the observer. They rest with _all the four wings perpendicular_, similar to the Swallow-tailed Butterflies, (_P. Machaon_, &c.) The present is a very rare species; we captured only two specimens near Bahia. ---- EUDAMUS Doryssus. _Posterior wings, with short snowy tails, and a half border of white on both sides; beneath brown, with a few paler dots near the base._ ---- The sexes of this species materially differ. Our figure represents the female: in the male, the wings are browner, and highly glossed at their base with green; the snowy border on the posterior wings is very narrow above, but much broader beneath. It appears very locally distributed; we found it common in the vicinity of Bahia. * * * * * * [Illustration: MITRANÆ Pl. 4. _Mitra episcopalis._] MITRA Episcopalis. ---- Family Volutidæ.--Sub-Family Mitrianæ. GENERIC CHARACTER. _Animal_---- _Shell_ never turrited or plaited, ovate-fusiform, the _base_ wide, obtuse, and truncated: _pillar_ with 4 plaits: the plaits simple. _Outer lip_ crenulated, or toothed: _Aperture_ at the base effuse, smooth within, and destitute of an internal groove. _Nobis._ Types of Form. 1, _M. episcopalis_. 2, _papalis_. 3, _scabriuscula_. 4, _Zebra_. 5, _ferruginea_. ---- SPECIFIC CHARACTER. _Shell with the spire thickened, and marked by transverse punctured dots: white with crimson spots; inferior spots small and quadrate, the superior large and irregular; pillar 4 plaited._