426 
Mr. Cecil W. Barker^s 
T. phlegetonia plentifully at the Lower Tugela in Decem- 
ber, 1890_, and on the same hillside in August, 1889, and 
again, in July, 1893, I found it replaced by T. antigone. 
The extraordinary variations in the $ s of T. antigone 
have also given great scope to the prevailing furor for 
species-manufacturing. These variations of the $s 
appear to be quite arbitrary, depending on neither 
season nor locality exclusively, for I have caught many 
different forms at one and the same place, and at the 
same time. The ^s, strange to say, hardly show any 
variation beyond the seasonal modifications connecting 
them with T. phlegetonia. 
The winter form of T. vesta, var. A of Trimen {T. 
argillaceus of Butler), is yet another excellent illustra- 
tion of the tendency of seasonal forms to modify accord- 
ing to well-defined rules. There is the usual attenuation 
of the markings of the uppers! de and the suffusion with 
reddish of the apical area of the forewings and the 
whole of the hindwings of the underside. The following 
dates are illustrative of the seasonal character of this 
differentiation : — 
August, 1889, I caught numerous specimens of var. 
A., T. vesta, at the Lower Tugela. At the same place 
in December (early) I caught many of the typical form, 
and a few intermediate between typical and var. A. 
Again, in July, 1893, I caught and observed at the 
same place var. A only. 
I could supplement these dates by other instances in 
other times or places, but as all the cases which have 
come under my observation bear out the contention that 
variety A is the winter form of T. vesta, it is unnecessary 
to do so. 
Eronia cleodora also has a well-defined late season 
form. It differs from the typical, or wet season form, in 
its smaller size, much narrower black borders to the 
wings on the upperside, and on the underside the 
adoption of a darker, more ochreous colour on the disc 
of the hindwings, and of the orange mark near apex of 
the forewings. 
Eronia huquetii also modifies seasonally, the winter 
form being devoid of the blackish apical bordering of 
forewings, this being replaced by a faint narrow brown- 
ish edging, in some examples hardly observable. The 
irroration of the underside of the hindwings is also more 
