392 Dr. A. G. Butler—A Revision 
surface of the secondaries, but the male dry-season form never 
shows the conspicuous discocellular black spot which charac- 
terizes the male of typical 7. Johnstont. 
Mr. Guy A. K. Marshall, who calls the species 7. opalinus 
and sinks it as a synonym of 7’, erts, says that the type is an 
unusually large female from Delagoa Bay. Of our eight 
females three ought to be called unusually large, four fairly 
large, and one rather small; but the name opalescens was 
given to the type because it is faintly opalescent on the upper 
surface and on the under surface of the primaries, a character 
which I have since discovered to be inconstant, as also is the 
width of the internal black bordering of the primaries, which 
is frequently as wide again as in the type. ‘The dry-season 
form is smaller than that of the wet-season, the primaries 
comparatively shorter and broader than in 7. Johnstoni, with 
the conspicuous black discal spots below which characterize 
the wet-season form, and with a series of scaly brown spots 
across the under surface of the secondaries between the 
nervures. ‘These characters and the lack of the black disco- 
cellular spot readily distinguish it from the dry form of the 
southern species. 
11. Teracolus maimuna. 
Idmais maimuna, Kirby, Proc. R. Dubl. Soc. (2) ii. p. 3838 (1880) ; 
Waterhouse, Aid Ident. Ins. ii. pl. exliii. figs, 1, 2 (1882-90). 
The figures of this species are very poor and convey a false 
impression of it. The range of ZT. matimuna appears to 
extend on the West Coast from Senegal to Angola; it isa 
large form, although small examples occasionally are to be 
found. Of our seven females, one from Angola is larger than 
the type of 7’. opalescens, whilst the dry-season females are 
quite small. 
This West Coast representative of 7’. erts is at once recog- 
nizable in the male sex by the dull smoky character of the 
apical patch, the spots on which are small and less solid in 
colouring than in any of the other types; the white area on 
the primaries is also much broader and terminated less irregu- 
larly, the margin of the secondaries is more or less spotted at 
the extremities of the veins. ‘The wet-season form may 
always be distinguished from males of Z. opalescens (in 
addition to the dullness of the apical patch) by the almost 
total absence of orange colouring from the under surface of 
the secondaries, whilst some examples show a discal series of 
dusky spots across the secondaries ; the intermediate season 
form, which we have chiefly from Nenegal, has a well-defined 
orange costal streak below and a faint trace of a saffron-yellow 
