than even the 3- $ , that in the same locality it is rare 

 to find two specimens which are absolutely alike, and 

 this applies to all the forms ; but there are some special 

 schemes of variation in the white markings of the under 

 wings which suggest the idea of double races for the 

 varieties, to which attention will be called further on; and 

 also the under wings of the species now under considera- 

 tion are easily distinguished from those of the varieties, 

 though I am unable to believe in a specific difference 

 between them. 



The specimens of Poseidon in the British Museum are 

 of a much warmer green than those of Pronomus, but in 

 other respects there are no differences except that the 

 black spots on the secondary wings are very small (or 

 smaller than in Pronomus). The wings of Pronomus are a 

 bluer green. 



S . In the Hewitson collection (Brit. Mus.), a rather 

 larger example than others in the museum, the hind 

 wings with slightly smaller and more accuminate black 

 spots in the discal white area, the three lowest are separ- 

 ate from, and the highest or first is united with the other 

 submarginal black by a long indentation of the same 

 colour. The shape of the white marks on the secondary 

 wings are very different from those of the Brit. Museum 

 specimens : the primary wings only exhibit the usual 

 trifling differences ; the white area divisions of the disc on 

 the secondaries are almost uniformly hastate nearest the 

 cell between the veins ; in a British Museum example 

 they are strongly accuminate. The white fascia of the 

 discoidal cell of the primary wing is also rather broader 

 and more obliquely placed. 



Hewitson's specimens of this species are bracketed 

 with Aruana of Felder, that is a pair of each species in 

 one group. 



O. PRONOMUS. 



" S . In general appearance it is like that of the 

 P. Priamus, but is rather smaller, and the primary wings 

 (besides the prominent bands of rich green) have the 

 outer side of the median nervure and more or less of the 

 base of the median nervule ornamented with the same 

 rich green. The secondary wings have the outer margin 

 much narrower than in P. Priamus, but with three rounded 

 black spots, one on each space between the costal nervure 

 and the discoidal nervule ; the spot that is situated 

 between the 2nd subcostal and discoidal nervules is 

 sometimes very small ; beneath each of these spots is, 

 in some specimens, a small golden spot. 



" The under surface of the primary wings is marked 

 very similarly to that of P. Priamus, but the golden green 

 partakes of a bluish tinge throughout its surface. The 

 under surface of the secondary wings is also similarly 

 marked, but the general surface is bluish, with the mar- 

 ginal portion golden green ; the golden spot above the 

 blue spot between the costal nervure and the ist subcostal 

 nervule is of a more lengthened form, though it is some- 

 times very small ; the golden spot below the 2nd, 3rd, 

 and 4th black spots is not so prominently marked as in 

 Priamus ; the outer black margin is very narrow, and the 

 anal angle is buffy yellow, with a black heart-shaped spot, 

 while in P. Priamus this space is black, with a small 

 buffy yellow mark." 



" ? . This sex agrees better with the figure given in the 

 Voyage d'l Astrolabe, t. 4, than with any figure that 

 represents the 2 of P. Priamus ; but it differs from it by 

 the marking in the discoidal cell of the primary wings 

 being more diffused towards the discocellular nervules ; 

 the other white markings are similar in position and 

 form, but in some cases they are rather larger. The 

 secondary wings are also like the above-mentioned 

 figures ; the four large buffy white spots between the 

 nervules retain somewhat of the tear-shaped form, espe- 

 cially that occupying the two spaces between the 2nd 

 subcostal and the ist median nervules ; but none of the 

 spots advance to the discocellular nervules, nor to the 

 median nervure, nor is there any white spot within the 

 discoidal cell, as is represented in that figure, though 

 they possess the black spot in the middle of each ; the 

 anal angle is buffy white, showing the black spot that 

 exists on the under surface ; and at the anterior angle 

 there are two buffy-white spots. 



"The under surface of the primary wings is like the 

 upper ; but the mark in the discoidal cell is not so diffused. 

 The under surface of the secondary wings is also like the 

 upper side ; but the two spots at the anterior angle, and 

 the outer portion of the space between the nervules are a 

 rich yellow ; and the space at the anal angle is equally 

 as prominent as the others." [In the collection of the 

 British Museum.] 



Habitat, Cape York, N. Australia. 



[See Gray's Catalogue of the Lepidopterous Insects 

 in the British Museum.] 



The following notes on examples in the British Museum 

 and Hewitson collections may be useful. 



S- . On the secondary wings are three black discal 

 spots, and outside the two lowest are two golden spots 

 nearest the margin ; of the 3 black spots the upper one 

 is rectangular, and the two below are quadrate in form. 

 [British Museum Coll.] 



S . This specimen is labelled Archideus. The anterior 

 wings green, with subcostal and marginal bands very 

 narrow — commencing at the base of the interior margin, 

 and being quite continuous along that and the exterior 

 margin to within a little of the apex ; with a green atomic 

 line half-way along the median nervure from the base ; 

 also with the three median nervules, except where inter- 

 rupted by the sexual brand, with similar green lines ; part 

 of the submedian nervules also treated in the same 

 manner. Secondaries with four black spots : the lowest 

 one being very small and rudimentary ; the black margin 

 very narrow and sinuate. 



This example has somewhat the appearance of Rich- 

 mondia, especially on the under surface. 



Length of costa 69 mms. [British Museum Coll.] 



$ . With the submarginal light area of the secondary 

 wings a little more buff-coloured than in the type, and 

 the discoidal-cellular white fascia of the primaries nar- 

 rower than in other examples. [British Museum Coll.] 



? . A small example, with a very small white spot 

 within the discoidal cell at its distal end above and 

 below, close to the nervures. [Hewitson Collection.] 



