IOLAUS. By Dr. C. Aurivillius. 
403 
light blue; the blue colour generally only occupies the proximal half of the discal cell, being distally slantingly cut off 
almost in a straight line and at vein 1 about 3 mm distant from the margin; the black apical part hereby attains in the 
middle a width of about 10 mm. Hindwing above light blue with a fine, black marginal line being in the areas 5 and 6 expanded 
into an apical spot of 2 to 3 mm width, and a very large, silvery grey spot at the costal margin; the mealy spot itself (of special, 
erect scales, occurring in other species in the centre of this lustrous spot) seems to be entirely absent here; the areas 
la and lb grey or blackish. Under surface white; forewing at the apex and margin as far as the postdiscal line distinctly 
darkened (particularly in the apical part); the transverse lines are greyish-brown; on the hindwing the whole postdiscal line 
and the submarginal line from the costal margin to vein 3 grey, brown or blackish; between vein 3 and the proximal margin 
the submarginal line, however, is thickened, dentate and orange-red; in area 2 it converges with the black-pupilled submarginal 
spot and in this area it also touches the postdiscal line. Anal lobe red, black and white, or above without any red. Forewing 
beneath at the anal margin with a broad mother-of-pearl lustre or light bluish; according to A. Schultze, in rnildbraedi 
on both sides of vein 1 with a feather-shaped scent-spot formed of pale ochreous scales, almost touching the margin; such a 
spot is not mentioned in the descriptions of the other species, though it may have been overlooked by the authors. 
Suffert and Schultze do not compare their species with J. aethria having been described before by Karscii. As 
I was only able to examine rnildbraedi, it is unfortunately not possible to state the differences of the single species. The descrip¬ 
tions and figures only exhibit insignificant differences. 
I. aethria Karsch (68 h). Mealy spot on the hindwing above separated by the blue colour from the aethria. 
black apical spot; forewing beneath with a black transverse streak at the end of the discal cell, at the anal 
margin broad bluish. Legs black and curled white. Togoland. 
I. mirabilis Ham. Dree, is without the transverse streak at the end of the discal cell on the forewing mirabilis. 
beneath, but otherwise the same as aethria. Sierra Leone. 
I. rnildbraedi Am. Schultze (70 h). The mealy spot of the hindwing above reaches to the black apical mildbraed 
spot and thus removes the whole blue colour in 5 and 6; forewing beneath with a fine transverse streak at the 
end of the discal cell; at the anal margin a mother-of-pearl lustre with the mealy spot mentioned above. 
Legs white, curled black. The $ has the normal shape of the wings of the Iolaus -$$, the blue colour is light 
violettish-blue, covering in both wings the whole discal cell; the black, about 2 mm broad marginal band of 
the hindwing is parted by a white band and separated from the margin by a fine white line of the areas l c 
to 3. Beneath as in the <$. South Cameroon. 
I. barbara Suff. (68 g). Hindwing above at the costal margin as far as the black apical spot lustrous barbara. 
grey. Forewing beneath without a transverse streak at the end of the discal cell. ,,Legs white“. Cameroon; 
Victoria. 
Fifth Group of Species. 
This group comprises the typical species of the genus and only differs from the fourth group by the 
thick transverse streak at the end of the discal cell on the forewing beneath. Postdiscal line of forewing and 
hindwing as far as vein 2 also thick and yellowish-brown; submarginal line also slightly thickened and similarly 
coloured, between the veins 1 a and 3 of the hindwing coloured red as usually. Anal lobe above red with a 
black dot and white marginal line. Hindwing with three small tails. 
Review of the 
A. The blue colour of the forewing above only forms an anal-marginal band of 5 mm width, covering the areas 
1 a and 1 b almost as far as the margin, and the basal part of the discal cell. Hindwing above as far as 
the apex only with a fine black marginal line. Under surface brownish-grey. Frons above reddish-yellow, 
below white. /. eurisus. 
B. The blue colour of the forewing above almost reaches the costal margin, it is distally rounded, extending 
beyond the discal cell, but at the anal angle separated from the margin by a black band of 2 mm width. 
The black marginal line of the hindwing above is somewhat expanded at the apex. Under surface creamy. 
Frons white, in the middle yellowish-brown. I. bolissus. 
I. eurisus Cr. (= thurani Suff.) (69 a). In the $ the basal area of the forewing above is light blue eurisus. 
at the base as far as the apex of the discal cell, then in the basal parts of the areas 2 to 5 and in the distal part 
of area 1 b white. Hindwing above at the costal margin as far as the discal cell and vein 5 blackish, in 
1 c to 4 bluish grey, distally whitish with a black discal transverse line, black veins, black submarginal 
spots in 1 c to 3 and a fine, white marginal line; under surface of a white ground-colour. Sierra Leone 
to Cameroon. 
I. bolissus Hew. (69 a, b) is beneath very much like eurisus, and above only different by the marks bolissus. 
already mentioned. $ unknown. Cameroon and Congo. 
Sixth Group of Species. 
To this group only a single species belongs different from all the others by the marking beneath. 
