KiNttsLEY. — On Diadema nerina. 207 



round blue-edged white spots across the disc towards the oblique 

 whitish band, beyond which they are continued by two small 

 round blue spots to the external margin of the tawny patch ; 

 between the oblique baud and the tawny patch there is a rather 

 faintly marked blue spot. A double sub-marginal series of in- 

 terrupted limulated bluish spots. 



Secondaries crossed by a broad whitish patch bordered with 

 blue ; a sub-marginal series of spots as in the primaries, but 

 more indistinct ; the series of round spots also continued as 

 rather faint blue spots. 



Body above blackish-brown ; head and pro-thorax white 

 spotted ; white vertical dash at back of each eye. 



Wings below, red- brown ; basal area of primaries ferru- 

 gineous ; basal half of costa black, spotted with white ; four 

 black-edged, sub-costal white spots, oblique patch of black 

 brown across disc to middle of costal area ; oblique band of five 

 white spots as on the upper side, the extra spot being on the 

 costal area. A double, sub-apical, whitish spot, with series of 

 small spots as on upper, the two blue ones being larger but more 

 faint, a double sub-marginal series of lunulated whitish spots, 

 fringe white, varied. 



Secondaries below, a diffused central transverse whitish 

 band ; a discal series of white spots, and a double series of 

 lunulated whitish spots ; body below red-brown, spotted with 

 white ; palpi and inner edge of femora, white ; expanse of 

 wings, -14 inches. 



In comparing this description with that in Mr. Enys' book, 

 there are tbe following differences : — 



On the primaries, he gives five elongated white spots, this 

 has but four, and bordered with blue tinge ; he gives a sub- 

 apical white spot ; this has a double white blue-edged spot ; his a 

 series of white spots ; this two of the series unmistakeably blue, 

 and a blue spot near the tawny patch ; his lunulated spots 

 were white, these decidedly bluish. 



On the secondaries, his large spot is edged with either tawny 

 or blue ; his diagram shows tawny ; this is edged with a 

 brilliant blue. 



He says nothing of the discal series of blue spots. 



Below, he does not mention the oblique band of black-brown, 

 but gives the costal base and anal area as ferruginous, which I 

 fail to observe. 



His measurement is 3 inches 9 lines ; mine, 4*5 inches. 



With regard to the rare occurrence of this species, as well as 

 the Yanessu antiopa, or Camberwell Beauty of the British Isles 

 (the latter only observed at regular periods of seven years), I 

 have long had a supposition that the larva of these butterflies 

 may very probably take a much longer period to arrive at 

 maturity, say five or six years ; if so, this would fully account 



