Anterior wings with the outer or exterior margin much shorter than the posterior; inferior wings lengthened horizontally, but short and rounded. Antennæ slightly pectinated in one sex only: palpi pointing vertically. Inhabits Tropical America only. _Nob._ ---- SPECIFIC CHARACTER. _Large: anterior wings black, with one basal, and two transverse, opaque, deep yellow bands; posterior yellow, with a broad black border; margins of both wings dotted with white._ P. Tiresia. _Cramer. Pl. 85. f. B._ ---- We now, for the first time, detach from the moth-like, or diurnal Sphinxes, all those large and imposing species which are found in Tropical America; and by comparing their characters with those of the Oriental group _Helonia_, it will be seen how strikingly they differ. During our researches in Brazil, the chief metropolis of this group, great attention was paid to these insects, of which we have a most extensive series. They fly slowly and heavily during the middle of the day, and on the least touch counterfeit death. Most of the species, when handled, discharge from their body a brown liquor, like their prototypes the _Heliconidæ_. ---- ANTHOMYZA heliconides, _Heliconian Burnet_. ---- _Anterior wings black, with one basal and two transverse hyaline yellowish white bands: posterior yellowish white, with a broad black border, margins of both wings dotted with white._ ---- If we were not in possession of both sexes of the foregoing species, we should have suspected that _this_ was a mere sexual difference; but the spots are transparent. The remarkable resemblance between this and some of the Heliconian butterflies, particularly _Linus_ and _Psidii_, (Cr. pl. 257.) is truly astonishing. Nature could not have stamped their analogy stronger. * * * * * * [Illustration: LEILUS _Surinamensis_. _Sw._] LEILUS Surinamensis. _Surinam Emerald Butterfly._ ---- Family, Papilionidæ. Sub-fam Papilionæ. Genus, Leilus. Sw. (_Fissirostral or Hesperian type_) Sub-genus. Leilus _proper_. Sw. SYNOPSIS OF THE SUB-GENERA. I. TYPICAL. Antennæ filiform, thickened in the middle; posterior wings with long pointed tails. LEILUS. II. SUB-TYPICAL. Antennæ as in the last, but arcuated near the tip. Tails of the posterior wings short and obtuse. ORONTES. III. ABERRANT. Antennæ clavate; front very hairy; tails none. RIPHEUS. Antennæ clavate; wings hyaline; tails very long. LEPTOCIRCUS. ---- SPECIFIC CHARACTER. _Wings black, varied with lines and bands of emerald-blue green: posterior tailed; the green spots round the margin running into each other; tails nearly white._ Papilio Leilus. _Linn. Sys. Nat. 2. 750. Fab. Ent. Sys. 3. p. 21. Merian. Surin. pl. 29._ Urania Leilus. _Fab. Syst. Gloss._ ----