500 PAPILIONID.E. 
river, and on the Ussuri between Noor and the Ema ; the largest and finest 
specimens are from the Bureija Mountains, and farther west they become 
smaller." 
Graeser (Berl. ent. Zeit. 1888, p. 64) states that the larva is velvety black, 
covered with yellomsh hau's, so thick on the sides as to give it a brownish 
appearance ; there are four triangular red spots on each segment ; the 
spiracles are ringed with red ; head round and blackish in colour, frontal line 
shining pale brown ; legs shining black, claspers reddish yellow. Feeds in 
June on Sedum, and the perfect insect appears from the middle of July to 
middle of August. 
The specimen described by Oberthiir as davidis was taken by I'Abbe David, 
in June 18G4, among the mountains of moderate elevation which surround 
the valley of Lao-hou-hoou, not far from Jehol, four days' journey to the 
north of Pekin. The figure of this insect in my copy of part iv. of Oberthiir's 
' Etudes ' has the fringes entirely black, whilst the antennae are pale, ringed 
with black and terminating in a black club ; and the black bar at anal angle 
contains two well-defined red spots. In part xiv. of Oberthiir's work the 
same specimen is again figured (pi. i. fig. 3), and here the antennae are repre- 
sented entirely black, the black bar at anal angle is without red spots, and 
above all the black fiinges, to which M. Oberthiir attaches so much import- 
ance, are distinctly interrupted with white between the nervules on both 
surfaces of all the wings. Great exactness is claimed for this figure by 
M. Oberthiir, but, curiously enough, it does not agree with the extended 
description of davidis which he gives on p. 3 of the part last mentioned, and 
which runs as follows : — 
" La figure du P. davidis est done trcs esaote et elle fait ressortir les caracterea de cette espece. 
" Les antennes sont blanches, finement annelees de noir avec la massue epaisse et noire. Les poils 
de la tete et du thorax sont jaunatres melanges de noir. Les ailes sont generalement 
obscures avec la frange paraissant entieremont noire. Les dessius et taches sont dans leur 
ensemble ceux de nomion et d'ailleurs de presque tons les Parnassius. Mais il convient de 
remarquer que la serie marginale des taches blanc-jaunatre opaques aux ailes superieures et 
inferieures est tres rapprochee du bord terminal. La poche cornee consiste en une caverne 
paraissant bilobee vue de face. Le profil en est represente sur la planche I. fig. 3 a." 
Oberthiir says that he would be inclined to consider davidis a local form of 
P. hotirathi, if it were not for the fact that the antennse, which in davidis are 
white with a black club and finely ringed with black, are entirely black in 
/'. honmfhi. I cannot agree with him for the following reasons : — The pouch 
