M. M. Latrielle and Godart, are evidently mistaken regarding the insect figured by Clerk, which they consider to be the female of _Polydorus_; this error we have ascertained from fine specimens of both sexes, sent from Java and now in our possession. We have figured the male, and Dr. Horsfield has enabled us to add the Caterpillar and Chrysalis. * * * * * * [Illustration: PTILIOGONYS _cinereus_. _Male_.] PTILIOGONYS cinereus,_ male_. _Yellow-vented Short-foot_. ---- Family Laniadæ. Sub-fam. Tyranninæ. Genus Ptiliogonys. _Nob._ GENERIC CHARACTER. Zool. Journ. no. 10. p. 164. ---- SPECIFIC CHARACTER. _Light cinereous; flanks olive; under tail covers bright yellow; quills and tail glossy blue-black, the latter ornamented with a central snowy band; chin and vent white._ For Synonyms--see pl. 62. ---- On the sixty-second plate of these Illustrations, we figured the female of this elegant and highly interesting bird, from a specimen sent to us from Mexico, by the late Mr. W. Bullock. We are now enabled to add the male from a fine example, obligingly presented to us by John Taylor Esq. F. R. S. It was killed near Real del Monte; and these, we believe, are at present the only specimens that have reached England. By viewing this as the type of the Scansorial group of the Tyrant-flycatchers, (_Tyranninæ_) every circumstance, even the most minute, regarding its structure and its colours will be explained. As representing _Brachypus_, (North. Zool. 2. 485.) and its analogies, it has the under tail covers richly coloured. As representing _Leiothryx_ (Il. 490.) it has the same coloured cinereous and silky plumage: as a scansorial type, it has a conspicuous although an _incumbent_ crest, and a long ornamented tail. It is a Titmouse among the Tyrants, and is nearly as much of a _Ceblepyris_ as of a _Tyrannus_. Indeed, when we described the female, we thought it actually entered the circle of the former, but the laws of representation has set us right on this point. _Phoenicornis_ is the first of the _Ceblepyrinæ_, as _Philiogonys_ is the last of the _Tyranninæ_. The _females_ of _Phoenicornis_ are clothed in the same slate coloured plumage, but, as being of a _fissirostral_ type, their mouths are conspicuously bristled, while those of _Ptiliogonys_ are quite smooth. Finally, the wings are those of a _Ceblepyris_, but the tail that of a _Tyrannula!_ * * * * * * [Illustration: PLECOCHEILUS _undulatus_.] PLECOCHEILUS undulatus. _Waved Pupa-snail._ ---- Family Pupadæ. _Guilding._ Genus Carychium. _Muller._ Sub-Gen. Plecocheilus. _Guild._ SUB-GENERIC CHARACTER.