392 
IOLAUS. By Dr. C. Aurivillius. 
Most of the species are large and the <$$ are nearly always above black and blue; only in two species 
the <$ forewing above shows a white ground-colour. Both wings beneath without a transverse streak at the 
end of the cliscal cell. 
Most of the species are known only in the male. I am therefore forced to base the following review 
exclusively on the <$<$. The colouring of the legs of I. inores is unknown to me; it is therefore not quite certain 
that it belongs to this group. 
Review of the^cT- 
I. Forewing with 12 veins; vein 7 into the margin. — Argiolaus Drc. 
A. Hair-pencil of forewing beneath black. 
a. Forewing beneath uni-coloured white or whitish, without markings, or with a fine submarginal line 
at most, at the margin not darkened or only slightly hued reddish, without a dark anal-marginal spot. 
*. Anal lobe of hindwing above more or less scaled red. 
j. Hindwing above in the areas 7 and 8 white or whitish-grey. The blue colour of the forewing 
in area 1 b and at vein 1 at least 3 mm distant from the margin. I. alcibiades. 
ft- Hindwing above at the costal margin black or blackish-grey. Hindwing beneath in area 2 
usually with a uni-coloured red, sometimes black-pupilled submarginal spot. 
o. The blue colour of the forewing almost reaches the margin in area 1 b and at vein 1 
or it is only 1 mm distant from it. 
§. Forewing above at the base of the costal margin black with or without blue scales. 
1. The blue colour above light sky-blue without a greenish reflection. 
I. menas. 
2. The blue colour above darker, in a certain light with an intense greenish reflection. 
I. iulus. 
§§. Forewing above at the base of the costal margin whitish. I. jamesoni. 
oo. The blue or green colour of the forewing is about 3 mm distant from the margin in area 
1 b or at vein 1. 
$. Wings above with a blue ground-colour. 
1. Hindwing above with a broad black marginal band being about 3 mm broad 
in the areas 1 c and 2, and beneath between the anal lobe and vein 3 with a very 
thick, black marginal line. Anal lobe above almost entirely black, only with 
few red scales. I. schultzei. 
2. The blue colour of the hindwing in all the areas reaches the black marginal line 
being about 1 mm thick, and in the areas 1 c and 2 it encloses black submarginal 
spots. Marginal line beneath veiv fine. Anal lobe above red with a black dot 
at the proximal margin. I. paneperata. 
§§. Wings above with a lustrous metallic green ground-colour. /. calisto. 
**. Anal lobe of hindwing above black with light green scales but without red. The blue colour 
of the forewing almost reaches the margin in the areas 1 a and 1 b. I. catori. 
fj. Forewing beneath with a broad, blackish-grey marginal band growing narrower towards the anal 
angle, and at the pioximal margin in 1 a and 1 b broadly blackish. Hindwing above at the costal 
margin as far as vein 6 black. The blue colour of the forew ing in the areas 1 a and 1 b at least 3 mm 
distant from the margin. I. laonides. 
I. maesa. 
B. Hair-pencil of forewing beneath light yellow or brownish-yellow 7 . Forewing beneath white, generally 
without any markings. 
a. Wings above blue and black. 
*. Hindwing above at the costal margin light blue and behind its middle with long, white, or light 
yellowish hairs turned backward; its apex very broad and obtusely rounded off; anal lobe of 
hindwing small, above black and white without red scales; small tail at the end of vein 1 b very 
long, about 15 mm, and at the apex distinctly spatulately expanded. /. caesareus. 
**. Hindwing above without long light hairs at the costal margin; anal lobe of hindwing above 
scaled red; small tail at the end of vein 1 b moderately long, at the apex not expanded, 
t. The blue colour of the hindwing readies the margin (the marginal line) and in the areas 1 c 
to 4 it encloses large, separate, black submarginal spots. Wings beneath without transverse 
lines. I. lukabas. 
