522 PAPILIONID.E. 
" En dessous, les diffcrciioes signalees en dcssus sont reproduites, puisque le dessous reproduit les 
dessins du dessus. 
" Je possede deux exemplaires absolument pareils du P. tamcrlamis." {Oherthib; I. c.) 
The female, which has not been previously described, only differs from the 
male in the rather yellower tint of the ground-colour, and in the black markings 
being paler; this sex is exceedingly rare, as among a large number of 
specimens there was only one female. Tamerlanus can at once be separated 
from its allies by the straight central line of secondaries, which has no tendency 
to form loops on the under surface ; the space between the two submarginal 
lines on primaries is frequently suffused with black, and in some specimens 
is entirely filled up with this colour. 
Fairly common at Moupin, Wa-ssu-kow, and Chow-pin-sa in Western 
China. 
Papilio alebion. 
Papilio alebion, Gray, Cat. Lep. lus. Brit. Mus. p. 30, pi. siii. fig. 6 (1852). 
Papilio mariesi, Butler, Ann. & Mag. Nat. Hist. (5) vii. p. 33, pi. iv. fig. 4 (1881). 
" The primary wings yellowish white, with six bauds across the wing black ; the first and second 
bands extend to the inner margin, the third to the fifth are short and reach only to the 
median nervure ; the outer margin very broadly bordered with black, which is divided in its 
whole length by two bands of yellowish white, and at the inner anterior angle by a short 
narrow band of the same colour. The secondary wings are yellowish white, having the first 
and second bands of the primary wings continued to the anal angle, where they unite ; the 
outer margin is bordered with black, having two short lines of yellowish white at the anterior 
angle, but towards the posterior part of the inner margin it is ornamented with yellowish- 
white and grey lunules ; the anal angle has a large patch of bright yellow with a black luuule, 
haviug a grey lunule in the middle. 
" Tho under surface of all the wings is very similar in colour and markings, but the outer margin 
is less black ; the commencement of the middle baud of the secondary wings has a bright 
yellow spot, margined internally with white and outwardly with black ; and below this spot 
is a short white line on the outward side of the band ; the patch at the anal angle is partly 
white and partly yellow. 
" This species is allied to P. yhjcerion, but the wings are of a more slender form. 
" In Collection (Brit. Mus.) from Northern China." I^Gi-ay, 1. c.) 
Var. mariesi, Butler. " Allied to P. alebion, from which it differs in the absence of the submar- 
ginal black band on the primaries, the narrower discal belt of secondaries, which is greyish 
externally, and becomes obsolete towards the costa, the slightly larger white spots above the 
blue-centred marginal black spols of the secondaries, and the slightly larger and deeper- 
coloured orange subanal patch : on the under surface the primaries differ as above, the outer 
discal line of the secondaries is obsolete, and the marginal black stripe encloses a much 
smaller s pot of the ground-colour at apex. Expanse of wings 2 inches 10 lines. 
