396 
IOLAUS. By Dr. C. Aurivillius. 
more remote from the spots and runs much more obliquely than is the case in the corresponding 2$ of 
julianus and julus. On all the wings beneath there is a broad, orange transverse line widening on the 
hindwing towards the costal margin, which is not the case in julianus and julus ; besides here the lower orange- 
red spot into which it terminates (in one specimen provided with a large black pupil) is entirely connected with 
the brownish-red anal spot by a narrow, faded, orange line, which is not the case in either of the 3 other species; 
on the forewing the apical part of the costal margin is rather broad and distinctly blackish-grey down to the 
median vein 2, whereas in the $2 of the other 3 species it is here only very faintly darkened; into this distinctly 
darkened upper costal margin vanishes the very broad orange transverse line which is situate close at the distal 
margin as in julius and extends parallel to it. Particularly this distinctly dark apical part of the distal margin 
on the forewing beneath, as well as the different markings in the lower distal-marginal part on the hindwing 
above separate these I. aelianus-9.9. from those of the three other species; they are the most closely allied to 
julius- but I do not believe that they might be a dimorphous form of it. aelianus cannot be the $ of calisto 
Dbl. & Hew. being rather similar to julius on the under surface, since calisto exhibits beneath neither 
traces of the orange transverse lines nor any of the distinctly dark apical part of the distal margin.“ 
s liar ns. I. silarus Ham. Dec. is described as follows: <$ above on the forewing of a lustrous violettish-blue, 
the apex, costal and distal margins being black; hindwing with two small tails of a lustrous blue, the costal 
margin broadly and the distal margin narrowly black; anal lobe carmine with violet scales and a black margin; 
a black spot between the veins 1 c and 2 encloses an indistinct red dot; another smaller red spot is situate bet¬ 
ween the veins 2 and 3 and also encloses an indistinct red dot. Under surface lustrous white; hindwing with 
a distinct, straight, red submarginal line extending from the apex of the wing to a red spot in area 2; anal lobe 
violettish-red with a black spot; within the anal lobe a black, interrupted line as far as vein 3. — above 
on the forewing violettish-blue, whitish at the base of the veins 2 and 3; the apex, costal and distal margins 
blackish-grey; hindwing violettish-blue, the apex, costal and distal margins blackish-grey, with a postmedian, 
irregular, black transverse band being bordered with red between the veins 1 c and 3; anal lobe carmine. Antennae 
black. Palpi above black, below white. Legs white. East Africa: Delagoa Bay. — The species is unknown 
to me. Druce compares it with iulus Hew.] but the description does not show by what it differs from silas 
Ww. and its race lalos. 
silas. I. silas Ww. (67 d, g). Forewing above lustrous blue; at the costal margin, at the apex (very broadly) 
and distal margin black; the blue colour is costally and distally rounded off and covers the discal cell, the areas 
1 a and 1 b as far as 2 to 3 mm from the margin, about the basal half of area 2 and a small part of the areas 
3 and 4; beneath the forewings are uni-coloured white without markings, or they show a more or less com¬ 
plete reddishryellow submarginal line. HindAving above blue, at the costal margin as far as the middle of area 
6 and at the distal margin narrowly black, at the proximal margin as far as vein 1 b whitish-grey or blackish- 
grey; the black marginal line is narrow (about 1 mm) and only expands to a AAddth of 2 to 3 mm at the apex 
anal lobe red strewn with some metallic scales, surrounded by white and decorated Avitli short black and longer 
AA r hite scales; in 1 c and generally also in 2 there is an orange submarginal spot more or less surrounded by black; 
3 small tails, that at the end of vein 3 short; hindwing beneath white with a fine postdiscal line being black 
in the areas 1 a to 2 and reddish-yelloAv in 3 to 7, a separate red submarginal spot in 2, a fine, black marginal 
line and a black anal lobe proximally broadly bordered with red. The mealy spot on the hindwing above is 
yellowish-brown and surrounded by a broad, blackish-grey zone covering the greatest part of the discal cell. 
-— The $ entirely resembles the $ beneath, but above it deviates by the blue colour being les£ extensive and 
covered with a grey or whitish tint; the black marginal band of the foreAving is about 4 mm broad at vein 2; 
on the hindwing the blue colour terminates a little behind the middle, AA r hereby a dark marginal band of 5 mm 
width is formed, enclosing large, generally united, reddish-yelloAv submarginal spots of the areas 1 c to 5. 
lalos. Cape Colony as far as Delagoa Bay. — lalos Ham. Drc. (67 g; f ?) is the north-eastern, somewhat larger 
race differing in the $ by the absence of the red submarginal spots on the hindwings aboA?e, and in the $ by 
both Avings above being in the middle broadly white or whitish instead of bluish; the reddish-yellow submarginal 
spots on the hindwings above are in the $ large though generally only developed in the areas 1 c, 2 (and 3). 
lasius. German and British East Africa. —- ab. -0 lasius Suff. is distinguished by both AA f ings above being as in the 
^ of a lustrous deep blue colour except the veins 2 to 4 of the forewing, which are dusted whitish almost as 
far as the black margin; on the hindwing the submarginal spots in 1 c and 2 are not yellowish-red but of 
a brilliant pure red colour. From the northern end of Lake Nyassa. 
crawshayi. I. crawshayi Btlr. (68 b). Only the £ of this species has been described by Butler, as folloAvs: ,,Most 
closely allied to trimeni (the trimeni mentioned here is evidently not the genuine trimeni but probably a $ form 
of silas)] the blue colour is more lustrous than in the $ of that species and without the AA-hite colouring 
on the forewing above; the median \ r ein and the veins 2 to 4, liOAA ? ever, broader black; hindwing at the costal 
margin and in the areas 6 and 7 Avhitish with black veins, at the margin about just as broad black as in lalos 
and with two almost united, orange submarginal spots towards the anal angle; fringes grey with white 
