Notes on Seasonal DhnorpMsm. 
425 
the striolations and freckling more defined. In some 
examples the nervules near the hindmargins are still 
clouded with blackish. On the upperside the longi- 
tudinal black bars of the <^s have nearly, or quite, 
disappeared, leaving only some fuscous clouding about 
base, and the ?s show a much contracted width of 
these bands and of the other fuscous markings. 
From this stage it becomes difficult to tell where 
T. gavisa ends and T. antevippe begins. Still later on 
in the season, August and September particularly, the 
$ examples of T, antevippe are generally smaller, with 
a disposition to greater acuteness of the apices of the 
forewings ; the apical bordering is narrower on the 
outside and almost obsolescent on the inside. The 
nervular spots of the hindmargins, hindwings have 
become mere faint streaks, and on the underside the 
apices of the forewings are freckled throughout and 
show no pale orange suffusion along the inner portion. 
The hindwings also are more densely freckled. The ? s 
of this form generally show a brighter orange or yellow 
apical patch. The 6 s and ? s of this late winter form 
approximate very closely to the corresponding sexes of 
T. simplex. The number of species recognized by some 
of our authorities, v/hich these above-described seasonal 
variations have given rise to, is legion — too numerous to 
comment upon individually in this paper. 
During the change of the seasons I have often come 
across intermediate forms in cop. with either T. gavisa or 
T. antevippe J or with slight modifications of the one or 
the other. 
To describe the transitions of T. omphale to T, theogene 
would be a mere repetition of the above, for they ex- 
hibit, with seasonal regularity, every gradation of the 
one form into the other, and are also equally common 
flies on the Natal coast. To give dates of capture of 
the different transitional examples of these common 
butterflies would also be superfluous, as so many, yearly, 
come under my observation. 
There can be but little doubt that T. antigone is the 
winter form of phlegetonia. Both forms are somewhat 
local, but wherever T. antigone is found in the winter, 
there you may be equally sure of finding T. phlegetonia 
in the summer. Intermediate forms, connecting the 
two so-called species, are not uncommon. I caught 
