Publ . 21 . X 11 . 1923 . IOLAUS. By Dr. C. Aurivillius. 393 
The blue colour of the hindwing is separated from the margin by a narrow or broad black marginal 
band and does not enclose any black sub marginal spots. At least the hindwing beneath with 
a black transverse line in lb to 2. 
o. Hindwing above without any red submarginal spots in 1 c and 2. 
1. The black marginal band of the hinclwing above as far as vein 1 b broad, at the apex 
about 3 mm, in area 1 c still nearly 2 mm broad. The blue colour of the forewing in 1 a 
and 1 b about 5 mm distant from the margin. /. julius. 
2. The black marginal band of the hindwing above much narrower, especially posteriorly. 
The blue colour of the forewing in 1 a and 1 b only 2 to 3 mm distant from the margin. 
I. silas v. lalos. 
oo. Hindwing above in area 1 c and usually also in area 2 with a red submarginal spot. 
I. silas. 
3. Wings above white, at the costal margin, apex and distal margin of the fore wing and at the margin of 
the hindwing more or less broadly black or blackish-grey. I. ismenias. 
I. piciggiae. 
II. Forewing with 11 veins; vein 7 into the apex or costal margin. 
a. Forewing beneath at the posterior margin with a sharply defined, black hair-pencil. Hindwing at vein 
3 with a rather long, hair-like, small tail. — Epamera H. H. Drc. — Wings beneath with a white ground¬ 
colour. 
*. Forewing beneath with a dark marginal band. I. Icion. 
**. Forewing beneath at the margin not or hardly darkened, uni-coloured white or only with a fine 
dark submarginal line; at the anal angle in 1 a and 1 b blackish, the dark colour, however, more 
or less completely covered with white scales. /. adamsi. 
(3. Forewing beneath at the whole posterior margin from the base to the distal margin covered will long 
black hair. Hindwing without the small tail at vein 3. — Sukidion H. Id. Drc. —- Wings beneath with e 
brown ground-colour. I. inores. 
1. alcibiades Ky. (67 d, f). Wings above greenish-blue; costal margin, apex and distal margin of 
forewing broadly black; the bine colour covers the discal cell, the base of the areas 2 and 3, and the areas 
1 a and 1 b as far as about 4 mm distant from the margin. Hindwing at the costal margin in 7 and 8 whitish- 
grey; marginal line, ends of veins and submarginal transverse streaks in 1 c and 2 black; the mealy spot whitish 
with a broad dark grey zone; wings beneath white, forewing with a red submarginal line; hindwing with red 
submarginal spots in 1 b and 2, a postdiscal line formed of black bows, and a red submarginal line from vein 3 
to the costal margin; the anal spot with a black clot. The $ differs by its lighter and somewhat less extensive 
blue colour and by large, red submarginal spots of the areas 1 c and 2 of the hindwing above. — The larva, 
according to Lamborn, is infested with the ant Cremastogaster Buchneri; it lives on an Aroiclea, Culcasia 
scandens Beauv. 
I. menas Iiani. Drc. (67 d). <$. Upper surface with a light sky-blue ground-colour: the blue colour 
of the forewing is clistally rounded in the shape of a bow, almost reaching the margin at vein 1 and covering 
more than half the area 2 and about the first third of area 3. The hindwing shows a black marginal line, at 
the costal margin it is blackish only in the areas 7 and 8 and at the base of area 6, and it has a rounded, 
jet-black mealy spot only distally narrowly encircled by grey; anal lobe red with some silvery green scales; 
margin at 1 b and 2 tailed, at 3 only slightly angled; forewing beneath white without markings; hindwing with 
a fine black postdiscal and marginal line, a uni-colourecl red submarginal spot in 2, which sometimes dispatches 
a fine submarginal line, and with a red, black-spotted anal spot. The $ (67 g?) *) deviates by the blue colour 
above being replaced by a milky-white colour faintly liued blue at the base of the forewing; hindwing also above 
with a postdiscal and submarginal line formed of dark streaks or dots of the areas 1 c to 6; the submarginal 
spot in 2 is larger, rounded and reddish. Senegambia to Gabun. 
I. iulus Hew. ( = mathilda Suff.) (67 d, e) is somewhat larger than menas with a green reflection on 
the blue colour; the latter is on the forevdng of the distally more irregularly though almost rectilinearly 
defined. The 2 is rather different from that of I. menas ; the light basal area of the forewing is violettish grey, 
distally whitish; the hindwings are brownish, at the apex of the cell and in the basal part of the areas 2 to 4 
greyish-violet, then -with a white postdiscal band and a white submarginal line in 1 c to 4 (to 6) and between 
them wdth thick, dark transverse streaks which are red and black in 1 c, jet-black in 2. — The larva, according 
to Lamborn’s statement, is of a wonderful ruby and green colour, it lives on a creeper and is visited by ants 
of the genus Cremastogaster; it has a distinct dorsal gland. Sierra Leone to the Niger. 
I. jamesoni Ham. Drc. is unknown to me, but it is apparently closely allied with iulus and only distinguish¬ 
ed by the costal margin of the forevung above being whitish at the base; the description at least does not 
*) This figui'e and some others marked with? were made according to specimens in the Berlin Museum, and the 
author was unfortunately not able to ascertain them without examining the specimens. 
alcibiades 
menas. 
iulus. 
jamesoni. 
XIII 
50 
