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vegetation and rainfall, “so that the extreme of a rainy- 
season form from a district where the rainfall is great and 
the vegetation dense, is much more pronounced than the 
extreme of a rainy-season form from a district with slight 
rainfall and sparse vegetation ; and these differences are even 
more marked in the dry-season forms.” The genera of 
Pierine dealt with in this paper are Huphina, Appias, Ixias, 
Terias, and Teracolus, and seasonal dimorphism is shown to 
prevail largely in all of them, so that the author feels war- 
ranted in materially reducing the number of hitherto ad- 
mitted species, contending that many of these are palpably 
founded on mere seasonal variations. 
In 1895, I had the pleasure of receiving from a valued 
friend and correspondent in Natal, Mr. Cecil N. Barker, 
the MS. of an interesting paper he had drawn up, from 
many years’ field observations, on the seasonal variation 
of butterflies in that colony and the adjacent territories. 
This paper, which was published the same year,* proceeds on 
much the same lines as that of Capt. Watson’s just noticed, 
but, instead of being confined to the Pierinz, traces the occur- 
rence of the phenomenon throughout the suborder, indicat- 
ing the following cases, viz., Acreinz 1 (in Acr@a) ; Satyrine 
2 (in Mycalesis) ; Nymphaline 9 (1 each in Atella, Junonia, 
Aypanis, Hamanumida and Charaxes, and 2 each in Precis 
and Crenis); Lycenide 3 (in Lycena); and Pierine 20 
(9 in Teracolus, 4 in Pieris, 3 each in FLronia and Terias, and 
1 in Herpenia). In many of these thirty-five cases the 
seasonal differences and the occurrence of intermediate 
specimens about the change of season are carefully described ; 
and several instances are recorded of the pairing of Pieris 
gidica with P. abyssinica or with intermediate examples. 
Mr. Barker’s observations were decidedly in support of my 
own published opinion as to the seasonal dimorphism of 
Hamanumida dedalus, Herpenia eriphia, Teracolus regina, 
T. speciosus, Pieris pigea, P. gidica, Hronia cleodora, and 
H. leda. 
* « Notes on Seasonal Dimorphism of Rhopalocera in Natal.” (Trans. 
Ent. Soc. Lond., 1895, p. 413.) 
