The passage from _Polyommatus_ to the type now before us, is distinctly marked by the section (for under that rank we may still retain it), named _Pithecops_; the palpi of these latter being both hairy, like the typical _Polyommatus_, and squamose, as in _Erina_: the posterior wings of both are also much of the same shape. By these blended characters Nature gently glides into the form now under consideration, which is the satyrian or _rasorial_ type of the genus; representing the _Satyridæ_, the _Hipparchianæ_, &c. and which supplies the place of _Polyommatus_, strictly so termed, on the Australian continent. We have already before us six species from that country; five of which are typical, but the sixth, the _L. ignita_ of our friend Dr. Leach (_Zool. Miss. I. pl. 60_), demands particular attention. We have elsewhere shewn that all aberrant forms unite into a circle of their own. Now as _Erina_, _Lucia_, and _Naïs_, are the aberrant forms of the genus _Polyommatus_, so there should be species either in the first or the last,--that is, in _Erina_ or _Naïs_, which would exemplify this theory in the present instance. We accordingly find it demonstrated by _Erina ignita_; for that insect, although essentially belonging to this type, in the characters of the _palpi_ and _antennæ_, nevertheless assumes one of the great distinctions of _Naïs_.---_The wings of the two sexes being different_: the posterior pair in the female are dentated, while those of the male are completely entire; so that the first might pass for a _Naïs_, and the second for an _Erina_; both sexes further shew the union of these two types, by having the under surface of their wings ornamented, as in _Naïs_, with silvery spots. Our figures, by the scale, are somewhat enlarged. We have sent a specimen of _E. pulchella_ to the British Museum for general reference. * * * * * * [Illustration: LUCIA _limbaria_.] LUCIA limbaria. _Brown-winged Blue._ ---- Sub-fam. Theclinæ. Genus Polyommatus. _Lat._ Sub-genus Lucia. _Sw._ SUB-GENERIC CHARACTER. Wings horizontally lengthened, entire: palpi very slender, ciliate with long hairs, the last joint very minute, scarcely distinguishable. Antennæ with a lengthened club, either cylindrical or compressed. Colours obscure, moth-like. ---- SPECIFIC CHARACTER. _Wings above brown, disk of the anterior fulvous, with two brown spots above, and three beneath, encircled with white: posterior beneath varied with grey and white, with a central band of square brown spots._ Hesp. Lucanus? _Fab. Ent. Syst. 3, 1, p. 322. Donovan's Ind. Ins. pl. 43, f. 4?_ Mus. Nost. ----