40 



is a close ally of the 2 of lydius, probably only a variety 

 of it. 



If we compare thee? $ of the two species crcesus andlydius, 

 we find that the secondary wings of the former are 

 generally without black spots, or that they never are more 

 than two in number, one of them being almost obselete ; 

 in the type of lydius there are four well-marked black 

 spots. The orange colour of all the wings is lighter, and 

 more shot with green, though intermediate gradations of 

 colour are met with in the various specimens of crcesus till 

 we reach the gorgeous colouring of lydius ; the very red 

 variety of the <? in the Hewitson collection which I 

 describe in the article on crcesus, if not an example of lydius 

 is certainly a close link between the two species. The 

 semi-diaphanous or brassy lemon mark on the lower 

 wings of lydius within the cell and outside, occupies a very 

 extensive area, but a relatively small one in crcesus, being 

 generally broken up into small marks and spots — very 

 small in an example in my collection ; but in crcesus there 

 are more marginal brassy spots, four in my example. 

 The orange of the lower wing of lydius is more 

 dusted with black atoms, and the median and other veins 

 are more strongly accentuated than in crcesus. The costal 

 longitudinal band of the upper wing is narrower in lydius 



than in crcesus : in the cell of crcesus it becomes quite 

 pyriform. On the under surface of the primaries of lydius, 

 the green occupies the greater portion of the cell ; in 

 specimens of crcesus, it is only a comparatively small spot, 

 of course, varying in different examples. In lydius the 

 green discal spots of the upper wings are graduated to 

 blue towards the outer margin ; in crcesus they are golden 

 green. In lydius between the 3rd median branch, and 

 submedian vein there is an elongated black mark ; in 

 crcesus this is absent, but there are sometimes indications 

 of this mark in atoms, and probably in a number of 

 individuals would be found some with or without the 

 mark, as I have shown in the plate of Richmondia. 



It is to be observed that the colour bands always found 

 on the posterior and exterior margins of the Primaries of 

 the Priamus group (least developed in Richmondia) are 

 entirely absent from crcesus and lydius, with the exception 

 of the orange mark at the posterior base of the wings. 



The types are in the Felder collection, now in the museum 

 of the Hon. Walter Rothschild. The species is also in 

 the museums of Messrs. Godman & Salvin, M. Ch. 

 Oberthiir, of Rennes, &c, but at present is a comparatively 

 rare insect. 



