IOLAUS. By Dr. C. Aurivillitjs. 
395 
only by the forewing beneath exhibiting within the marginal band another dark transverse band tapering 
posteriorly and terminating in area 1 b. Sierra Leone. 
I. parasilanus Rbl. is unknown to me. The blue colour above is a little darker than in 1 . iulus Hew. ; paras ila- 
the black distal part has almost the same extent, but it is at the proximal angle a little broader than in iulus. 
The costal margin and fringes of the forewing are here likewise black. The hindwing shows a broad black margin 
being 3 mm broad at the costal angle and slowly narrowing towards the anal angle. Anal lobe cerise. The sexual 
mark consists of a circular, dark grey costal-marginal spot inside filled up with black, not quite reaching to 
the proximal margin of the discal cell. The small tail on vein Cu2 (= vein 2) is 5 mm long and at the base 
and apex white. (The small tail on the anal vein is absent.) The fringes are white in their terminal half. Under 
surface silvery white, forewing with a fine, brownish transverse streak at the end of the discal cell, a fine brownish 
transverse stripe at two thirds, and another, orange, parallel one between the latter and the margin. On the 
hindwing the proximal transverse stripe extending at two thirds is almost straight and brownish, above the 
anal angle it is sharply broken, and in its part returning towards the proximal margin black. The distal trans¬ 
verse stripe is here orange, two, as in the forewing. In the anal lobe there is a red, round macula proximally 
bordered by violet, distally by black, and in cell 2 a much smaller red dot. Tarsi with distinct black rings (Rebel 
i. litt.). It therefere probably belongs to the third group. Length of forewings: 20 mm. Captured in the prime¬ 
val forest on the north western shore of the Lake Tanganyika. 
I. caesareus Auriv. (67 f) is one of the most beautiful and most peculiar species of lolaus. <$. caesareus. 
We may add to what has already been said above, that the blue basal area of the forewing is distally, between 
the apex of the cell and vein 1, almost quite straightly cut off and almost reaches the margin in 1 a and 1 b. 
The mealy spot of the hindwing is very small, but surrounded by a very broad zone; the blue colour of the 
hindwing passes over into a light blue towards the costal margin, and everywhere it almost completely reaches 
the margin, the black marginal line is extremely fine, being distinct almost only at the ends of the veins; areas 
1 a and 1 b black; anal lobe small, black and white without any red. Both wings beneath white; forewing without 
markings; hindwing with a small, black, proximally red dot in 2 and a small black anal spot bordered with 
red and scaled blue; post discal line scarcely visible; sub marginal line absent. The $ is unknown to me. Cameroon. 
L lukabas Ham. Drc. (67 f). The blue basal area of the forewing is distally rounded off, covering lukabas. 
about half of the areas 2 and 3, and in the areas 1 a and 1 b at least 3 mm distant from the margin. Hind¬ 
wing above in 1 a and 1 b grey, otherwise as far as vein 7 and as far as the fine black marginal line of a bright 
sky-blue with a red anal spot and large, black submarginal spots in 1 c to 4. Wings beneath white; 
forewing without any markings; hindwing only on the anal lobe with a black spot proximally bordered with 
red, and a red dot in area 2. P unknown. Senegambia. 
I. Julius Stgr. (68 e). The $ resembles that of lukabas, but it differs by the greenish-blue colour abo\?e julim. 
being much less extensive; on the forewing it only covers a part of the discal cell and not or but little the base 
of the areas 2 and 3; on the hindwing it is separated from the margin by a proximally irregularly lobate, black 
marginal band of 2 to 4 mm width. Mealy spot olive-brown surrounded by a lustrous black. Stattdixger 
describes the $ as follows: ,,I. julius $ is above still more intensely blue than julianus (= alcibiades) —-2, 
without the intense greenish hue of the latter species;-the black marginal parts of the forewings contrast still 
more with the blue; on the hindwing the costal margin is light only in the uppermost part (as far as it is 
covered by the forewing), otherwise black, particularly between the subcostals 1 and 2, where it is greyish- 
white in the larger proximal part in julianus, and in julus mostly somewhat light-coloured, though never so 
intensely black. Above the brownish-red anal eye-spot differing from the two other species there is an orange 
spot distinctly encircled by black, above which there are two more black marginal spots, the lower of which 
shows some orange scales in the centre; these three distal-marginal spots are contiguous at the veins; in front of 
them there are three oblong, distinct, black spots in the blue ground-colour, which differ entirely from the four 
blackish streaks in julianus {alcibiades)- $ or even julus- ?, where they flow together like a band.“ 
I. aelianus Stgr. Of this species, unknown to me, only the $ has been described. Statjdinger, in aelianus. 
1891, writes about it as follows: ,,Size 40 mm; the upper surface shows a blue colour similar to that in julius- ?, 
perhaps a little lighter, though by no means so greyish, as in julianus-, the black marginal parts of the forewing 
are somewhat broader than those in julius, and contrast just as strongly with the blue; on the hindwing the 
costal-marginal part between the subcostals 1 and 2 (= veins 6 and 7) is just as black as in julius the 
brownish-red anal spot, however, is different, with a black spot downwards as in julianus and julus ; 
different from those of the other three species are the three black marginal spots above it, since in the 
lowest being faded in both aelianus- ?? there are no traces noticeable of orange or reddish scales; the two 
upper ones are distinct and are separated from each other by the median vein 2 (= vein 3) and some blue 
colouring; in front of them there is in the Sierra Leone-? a distinct, dentate, black transverse line mar¬ 
king growing indistinct downwards and being neither so broad and distinct in another ?; this black line is 
