Koies on Seasonal Dimorphism. 
415 
both in the typical form and its so-called variety archaloia 
(which^ I believe^ is a true species), each, show in their 
winter forms a marked change of facies. The pale orange- 
ochreous of the underside of the hindwings and apices of 
forewings, together with their spots and markings, are 
all suffused by a ferruginous ground-colour which, in the 
hindwings, encloses three macular oblique whitish bands. 
Intermediate or transitional forms of either species are not 
uncommon, about the change of the seasons, in which 
the suffusion of the spots and markings peculiar to the 
full winter form is only partially effected. Hamamcmida 
dsedaUis affords another very striking example of 
attenuation of the whitish spots, and the adoption of a 
darker unspotted underside in the dry season forms of 
the species. 
To illustrate the regularity of this seasonal change of 
facies (which, however, in H. dsedalus occurs later than 
that of some of the butterflies, both in the spring and 
autumn of the year respectively), I have appended the 
following dates of capture from my notebook : — 
Dec. 19th, 1889, one c^, Meleagris form. 
„ 22nd, 1889, „ ?, 
March 30th, 1890, „ 6, 
From the 9th to the 19th of March, 1891, I observed 
and captured a large series of this butterfly in the 
TJssatu Yalley and neighbourhood of Swaziland. All 
these without exception were the summer or Meleagris 
form. 
On my return to Malvern— 
April 7th, 1891, one ^, typical form. 
„23rd, 1891, „ ?, „ 
My notes also mention the abundance of this butterfly 
during this month (April), whereas hitherto, as far as my 
experience and the far larger experience of Colonel 
Bowker goes, it had always proved a very rare visitor to 
these parts. From this time up till now, Dec, 1894, the 
butterfly has continued prevalent throughout the year. 
Further dates of capture represent only a few out of 
the many observed. 
