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Show 36 MR. H. J. ELWES ON THE GENUS PARNASSIUS. [Jan. 19, from their flattened appearance and age seem to have come from the same source. I have been able to find out the route which Major Charlton followed in Ladak, or Chinese Tartary as it was called in those days, and among the few scientific travellers who have been to that remote and inhospitable region, none seem to have again found this curious little insect. It may, however, be distinguished from P. acco and P. sikkimensis by the fringes of the wings, which are black in the fore wing and greyish white in the hind, whilst in P. acco they are all whitish. The antennae are black, the pouch is unknown; and the position of the species in the genus must therefore remain doubtful, though I should imagine that it will be found nearly allied to P. acco. P. JACQUEMONTI. Parnassius jacquemonti, Boisduval, Sp. Gen. p. 400 (1836) (in part). ? P. jacquemonti, Gray, Cat. Lep. Brit. Mus. p. 7Q, t. xii. figs. 1, 2 (1852), d. ? P. jacquemonti, Moore, P. Z. S. 1865, p. 488. P. epaphus, Oberthur, Et. Ent. liv. iv. p. 23 (1879). ? P. actius, var. rhodius, Honrath, Berl. ent. Zeit. 1882, p. 178, t. ii. fig. 6, 6* • P. epaphus, var. sikkimensis, Elwes, P. Z. S. 1882, p. 399, t. xxv. figs. 4, 5, 6, 5 . The synonymy of this species is the only one which has given me any trouble to clear up, and this arises principally from the fact that Boisduval probably used examples of two species in writing his description, and that his female type is not now to be found either in the Paris Museum, where the other specimens collected by Jacquemont which Boisduval described are preserved, or in his own collection, now in the possession of M . Oberthur. The point on which the whole question turns, is the fact that Boisduval says in describing the male that the fringes are entirely white, which is not the case in this species; and of the female he says that it is like the male, "La poche de l'extremite de l'abdomen assez developpee, plissee en travers et sans carene longitudinale." As no other species is known to exist in which a pouch of the apollo type is without a keel, this fixes Boisduval's female with certainty ; and though the name jacquemonti might perhaps be applied to the species of which he described the male-my actius, var. himalayensis-using Obei-thiir's name of epaphus for the species now in question, yet, as Oberthiir's name was applied to Gray's insect of which he had only seen a plate, of which he did not know the female, and which, after having seen the specimens figured by Gray, I cannot distinguish from actius, I think it is more correct to apply Boisduval's name to a species of which there can be no possible doubt he described one sex. With regard to the insect described by Honrath, from specimens collected by Stoliczka, as actius, var. rhodius, I cannot distinguish the male sex from that of P. jacquemonti. Charlton's specimens figured by Gray may be one or the |