The aberrant group of the Sub-family _Papilionæ_ appear to be the genera _Leilus_, Sw. (_Uranea_ Lat.) _Antimachus_, Sw. and _Clytia_ Sw. the two typical genera being _Papilio_ and _Amphrisius_, Sw. * * * * * * [Illustration: THOAS _Lysithous_.] THOAS Lysithous, _Lysithous Butterfly._ ---- Sub-fam. Papilionæ. Genus, Papilio. _Sw._ Sub-genus Thoas. _Nob._ SUB-GENERIC CHARACTER. Posterior wings terminating in spatulate or obtuse tails; the margins deeply scoloped; _Larva_ smooth; _Pupa_ braced, with the head directed _upwards_. TYPICAL SECTIONS. 1. Wings with macular yellow bands. PAP. THOAS. _Auct._ 2. Wings with entire white bands, the posterior spotted with crimson. AGAVIUS. 3. Wings black, varied with emerald green bands or dots; tails short, obtuse. PARIS. 4. Tails obsolete. EVANDER. 5. Tails short, acute. ANDROGEUS. ---- SPECIFIC CHARACTER. _Wings uniform black; anterior with a white band; posterior dentated and tailed, margined by red lunules; the disk white, bordered behind by 4-5 red spots._ Papilio Lisithous. _Ency. Meth. 1. p. 73, no. 136._ ---- We discovered this imposing species in the interior of Brazil, in 1814, long before it was made known in France by the specific name we have adopted. It is confined to the southern provinces; for we never met with it north of the Rio St. Francesco. Although greatly resembling _Thoas Agavus_ and _Harrisianus_, (Z. Ill. 1 Series, pl. 109) it is at once distinguished by the longer and more acute dentations of the inferior wings. The under side shews no material difference from the upper. To the second type of this subgenus belongs also _Ascarius_ L. _Polybius_ Sw. (Z. I. 1 Series, pl. 137), and _Tros._ Fab. while _Dardanus_ F. probably connects this American group with the third or _Paris_ type, whose geographic range is confined to Asia. In the fourth form (_Evander_), representing the Heliconian type, the tails are obsolete, but they begin to appear again in the fifth, and thus complete the circle of the sub-genus _Thoas_. By studying this natural series, the Entomologist will discover a most beautiful set of analogies between the genera _Papilio_ and _Amphrisius_. * * * * * * [Illustration: MUREX (_Pteronotus_) _pinnatus_.] MUREX (_Pteronotus_) pinnatus. _Finned Murex._ ---- Family Buccinidæ. Sub-fam. Muricinæ. _Sw._ Genus Murex. _Lam._ Sub-genus Pteronotus. Sw. SUB-GENERIC CHARACTER. See Pl. 100. ---- SPECIFIC CHARACTER. _Shell snowy white, with three twisted varices, which are surmounted by a thin, dilated fringe, having the margins undulated; channel curved; outer lip crenate._ Murex pinnatus. _Swains. Bligh. Cat. App. p. 17._ _Martini. Conch. 3 pl. III. fig. 1036-1037._ (_bad._) ----