This, which appears the most aberrant type of the genus, immediately reminds the student of a dark coloured _Erycina_ or a _Phalæna_, both of which families, as being the Heliconian or Erycinian type of _Polyommatus_, it truly represents. It is at once known from _Erina_, by its very peculiar palpi, and by its more lengthened wings. The antennæ of three species now before us, present a remarkable difference. In two of these, the club is compressed and spatulate, like that of _Erina_; but in the third, here figured, it has the cylindrical form belonging to _Naïs_. Which of these forms is typical, must at present, be undecided; but there cannot be a stranger link of connection between _Lucia_ and _Naïs_, than the fact of this species borrowing, as it were, the cylindrical club of the latter. Without such a link, in short, the series would be imperfect. As we cannot satisfactorily determine whether the types here figured of _Lucia_ and _Erina_ are described in books, we have been compelled to regard them as unnamed. This, and the two other species we possess, are all from Australia. On bringing the genus _Polyommatus_ to analogical tests, the only demonstration of a natural group, we find the sub-genera representing the families of the Diurnal Lepidoptera, in the following manner:--1. TYPICAL, Polyommatus, _Papilionidæ_.--2. SUB-TYPICAL, Lycæna, _Nymphalidæ_.--3. ABERRANT, Naïs-_Hesperidæ_, Lucia-_Erycidinæ_, and Erina-_Satyridæ_. * * * * * * [Illustration: NAÏS _splendens_.] NAÏS splendens. _Blue-shouldered Copper_. ---- Sub-fam. Theclinæ. Genus Polyommatus. Sub-genus Naïs. _Sw._ SUB-GENERIC CHARACTER. Wings sub-angulated; posterior dentated, particularly at the anal angle. Copper coloured above, with silvery spots beneath. Antennæ cylindrical, thickening from the base: the tip truncate. ---- SPECIFIC CHARACTER. _Wings above coppery, with black dots, their basal half-shining blue; beneath fulvous; the posterior varied with ferruginous, and marked by silvery spots._ Pap. Naïs. _Cramer, pl. 57, fig. D. E._ ----