Publ . 26 . TI . 1924 . 
IOLAUS. By Dr. C. Aurivillius. 
401 
spot in 2 and with the anal spot they are united; forewing with a fine grey transverse streak at the end of the 
discal cell. The $ deviates above from the d' by the blue colour of the forewing distally passing over into 
white, the costal margin of the hindwing being broad black and the areas 1 c to 4 showing black submarginal 
spots. German and British East Africa. —- By the white hair-pencil of the forewing beneath this species differs 
from all the others. 
I, creta Hew. (68 f). <$. Both wings above sky-blue; apical half of forewing black, the black colour creta. 
at the base of the veins 3 and 4 extended towards the base, at the anal margin 3 mm broad; hindwing in la 
and 1 b dark brown, only at the apex narrow black; no submarginal spots; anal lobe white and black 
almost without any red; the mealy spot is of a moderate size, round, brown with a broad, lustrous grey zone. 
The under surface is white and distinguished by the brown postdiscal and submarginal lines being of an irregular 
thickness and at least united at the costal margin; the anal spot and the submarginal spot in area 2 black 
proximally bordered with red. $ above lighter blue with a black costal-marginal band of the hindwing 
(as far as vein 6); hindwing in the areas 1 b to 3 at the margin white with a black marginal line and black 
submarginal transverse streaks and besides with a round black spot in area 2. Congo District. 
I. carina Hew. (68 f). This delicate species is particularly distinguished by the great extent of the carina. 
light, in the $ blue, in the $ almost white colour of the upper surface; on the forewing the light colour reaches 
to the costal margin, extending far beyond the apex of the discal cell and being distally very much rounded 
off; the black apex is therefore only 5 mm broad and gradually narrows towards the anal margin. The hindwing 
in the $ shows a small mealy spot, a fine black marginal line and a grey proximal margin; in the $ only a black 
submarginal line broken up into spots; the rest is blue in the $ and whitish in the $. Beneath with two 
widely separated, fine, reddish transverse lines, the proximal line extending across the middle, the distal line 
corresponding to the postdiscal line of the other species; the submarginal line is absent; a small, black 
submarginal dot at the anal angle and in area 2; both towards the base bordered with orange. ,,West 
Africa “. 
I. iasis Hew. (= bertha Stiff.) (68 f.). Wings beneath white with fine blackish-grey postdiscal and iasis. 
submarginal lines; forewing at the margin feebly darkened; the submarginal line of the hindwing is in area 2 
united with the red bordering of the submarginal spot and is then thickened as far as vein 1 a and orange; 
anal lobe white with a black, proximally red spot as usually strewn with some metallic scales. The upper sur¬ 
face of the <$ has already been described in the review (p. 399). The 2 differs above by the blue basal area 
of the forewing being smaller and distally, particularly in 1 b, 2 and 3 whitish; hindwing at the costal margin 
as far as the discal cell and vein 5 black, in the discal cell and the basal part of the areas 1 c to 3 light bluish, 
then in 1 c to 4 violettish-grey or whitish with black postdiscal transverse streaks in 1 c and 2 and with 
a black submarginal spot in 1 c; anal lobe as in the proximal margin grey; fringes white. Senegambia to 
Kuilu. 
I. albomaculatus Em. Sharpe is unknown to me. The short description says: allied with I. iasis (68 f), albomacu- 
but easily discernible by the white spot of the forewing. <§. Forewing: costal margin and apex black, towards 
the anal angle much narrower; the middle deep blue, brightened by a white spot in the upper part of the middle; 
hindwing similar to that of I. iasis, the blue colour somewhat more purple; the under surface does not deviate 
from that of I. iasis. Toro. 
I. sibella Ham. Dree. (68 g) differs above from iasis only by the marks mentioned in the review, sibella. 
Beneath white and similar to iasis, except both the transverse lines of the forewing and the submarginal line 
of the hindwing being absent or indistinct. Cameroon. Fernando Po. 
I. cytaeis Hero. (68 g). Wings above deep blue; forewing at the costal margin as far as the discal cytaeis. 
cell, at the apex very broad (about 8 mm) and at the distal margin as far as the anal margin (about 3 mm 
broad) black, the blue colour distally rounded off; the black marginal line of the hindwing at the apex expanded 
into a band of 2 to 3 mm width. Beneath white, only differing from iasis by the submarginal line and the red 
submarginal spots of the hindwing between vein 3 and the proximal margin being united into a broad orange- 
red band. $ unknown. Fernando Po. 
I. cottoni B.-Bak. (68 g). The £ of this species differs from all the allied species by the dark greenish- eoltom. 
blue colour on the forewing above covering the greatest part of the areas 2 and 3, whereby a black marginal 
band of only 2 (to 3) mm width remains between the vein 4 and the anal margin; in the areas 4 to 6, however, 
the black colour reaches to the apex of the discal cell. Hindwing at the costal margin as far as vein 6 
and at the proximal margin in 1 a and 1 b black; a very fine black marginal line; fringes white; mealy spot 
lustrous black, covering the discal cell. Wings beneath white, at the apex and distal margin of the forewing 
as far as vein 2 darkened; the postdiscal line of the forewing only reaches vein 3; hinclwing with a distinctly 
prominent, reddish postdiscal line, but without a submarginal line; a separate, red submarginal spot in 2; anal 
spot black, proximally bordered with red. Congo District: near Makala and Beni. 
XIII 
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