189 
During the development of the butterflies the wing-covers became 
\.t first whitish, and not transparent, and the eyes dark. On the third 
lay before the last the thorax became of a brown colour, the wing- 
ases and the abdomen pale dirty yellow. Over the brown eyes the 
he darker curved streak was still visible. The leg and wing-cases 
lad each received a broad longitudinal line, and the tips of the an- 
enna9 showed themselves as two brown, elongated, longly-elliptical, 
mall spots, between the ends of the wing-cases. On the day before 
he last the wings and the end of the abdomen had taken a brown 
olour.* The first butterfly (a female) appeared on the 31st May. 
Lccording to the time of extrusion of these four specimens, the 
uration of the pupal state of the first generation (if there be a 
Bcond) is 12—14 days. The butterflies (2^5^, 2 ? ) were true Arta- 
erxes. Only, one of the males had on the upper-side of the fore-wing, 
istead of the white spot, nothing but a very small whitish dot, scarcely 
erceptible, but, like the others, no trace of the black mark always 
resent in Medon. 
If I now compare the descriptions of the larvae of Medon and 
[rtaxerxes, made after a number of specimens, the diff'erence in the 
)lour of the dorsal stripe is first noticeable ; purple-brown in Medon, 
ark green in Artaxerxes ; and in the latter it is even difiereutly formed, 
-at least, I find in my memoranda about Medon nothing mentioned 
3out a narrowing of the same in the segments. 
But this being a difi"erence of colouring, I lay no stress upon 
, any more than upon the colour of the lateral swelling, which in 
Tedon is simply purplish-red throughout, instead of being lighter in 
le middle, as in Artaxerxes. The difiereuce in the build, and in the 
ubescence of the swellings, is much more important. It is said of 
':edon, that those (swellings) situated near the dorsal stripe bear 
imerous bristles of unequal length ; of Artaxerxes, that they have 
ily apparently thicker bristles than the rest of the body. I am sorry 
at, relying upon the exactness of my last year's description oi Medon 
rvae. I have not drawn up that of Artaxerxes, with my notes upon 
e former before me, and that, therefore, to make quite sure, new 
iscriptions will have to be taken, 
I therefore omit to point out also the other small differences, 
lich perhaps lie more in the words than in the reality. But supposing 
at both larvae are built quite alike, and that the colour of the dorsal 
* The larva and pupa of Artaxerxes were described by Mr. Buckler in our last numhpr Cn \'!R\ ;„ 
"v"d ,W th' ^""""■' ^1^' ''^. T"' ^'■°^- ^^"""^ description for the sak^of comSn • it will b2 
Uty -Eds ''^"^" '" '" ""'"'^''"" P°'»'«' '"« differences being more thoa7of ^^rds thai, of 
