Lepidoptera of Sikkim. 429 
scales close to the angle. There is also some variation 
in the white lunules which are present at the abdominal 
angle of the hind wing, and in some specimens show 
more or less on the upper surface. The female form 
described as Icarius is, without doubt, the female of this 
Species. It is rare in Sikkim. 
411. Papilio helenus. 
Papilio helenus, Linn., Mus. Ulr., p. 185 (1764). 
One of the commonest species of Papilio at all eleva- 
tions up to 5 or 6000 ft., but most humerous in the low 
valleys from April till October. 
412. Papilio chaon. 
Papilio chaon, Westw., Arc. Ent., lin» Sling ite iti. ol 
(1845). 
Not uncommon in the low valleys, and often seen 
flying up and down the course of the rivers, in company 
with helenus and many other species, from April on till 
October. 
413. Papilio polytes. 
Papilio polytes, Linn., Mus. Ulr., p. 186 (1764). 
Papilio pammon, Linn., l. c., p. 189. 
Found in Sikkim at low elevations only, and not so 
common as in the plains, from March all through the 
year. 
414. Papilio erithonius. 
Papilio erithonius, Cram., Pap. Ex., iii., . 2324, B 
(1782). 
Rather a species of the plains than the hills, and only 
found in the Terai and outer hills at low elevations. 
415. Papilio Slateri. 
Papilio Slateri, Hew., Ex. Butt., ii., Pap., t. 4(1859). 
This is a very rare species, which I have never seen in 
Sikkim. It seems only to occur in the outer hills at a 
very low elevation, and the few specimens Moller has 
procured were taken at Sivoke in May. Moller describes 
the female as having the wings conspicuously broader, 
TRANS. ENT. SOC. LOND. 1888,.—parr it. (ocr) “2a 
