1886.] MR. H.J, ELWES ON THE GENUS PARNASSIUS. 49 
It is a bright yellow male, and resembles those afterwards collected 
in some parts of the upper Amur region, which are in Hewitson’s 
and Godman’s collections, and also the single male from the Yukon 
river, Alaska, figured by Edwards. The specimen figured as type of 
P. felderi by Bremer, and which appears to be a female, though 
nothing is said as to sex, was taken by Dr. Radde in the Bureija 
Mountains north of the Amur river; and the dark and apparently 
worn female figured by Ménétries as P. wosnesenskii was brought 
from Ochotsk in N.E. Asia. Since then it has remained a rare 
species, but some examples of P. felderi were taken by Christoph at 
Raddefskaia, on the Amur; and I have seen others in Dr. Fixen’s 
collection, taken at Starikova, on the Amur, and at Raddefskaia, on 
the 7th and 29th of July. Besides these, a small number of P. evers- 
manni have been recently collected near Nikolaievsk, on the lower 
Amur, by Herr Graeser, and sent to Herr Dieckmann of Hamburg, 
and others I believe have since been taken in Alaska. It is said by 
Christoph to be local, and hard to catch, flying over deep bogs. 
Dr. Staudinger has a male from the Yenesei river, and others from 
Nikolaievsk at the mouth of the Amur. 
In most specimens of P. felderi the yellow colour fails almost en- 
tirely, and the red ocelli are often absent in the male sex ; the yellow 
hairs of the body and costz are, however, the same in both forms, 
though not so abundant in P. felderi as in P. eversmanni. The 
pouches, which are quite of the same form and size as in P. mnemosyne, 
are alike in both species, and until we know more about them it will 
be difficult to separate them. The variety named thor by Mr. H. 
Edwards was described from a single male specimen taken in June 
1877, 800 miles up the Yukon river, in Alaska, not far from the 
place where the specimen of P. eversmanni figured in the ‘ Butterflies 
of North America’ came. It is described as differing not only in the 
ground colour, which is sordid white as in P. clarius, but in the broader 
black base of the fore wings, the wider bands, and the much larger 
proportion of black on both wings. The red spots also are more 
numerous. The description seems to correspond very fairly with 
the plate of P. felderi given by Bremer. Mr. Edwards hesitated long 
before describing this as a distinct species, and says that it may 
ultimately prove to be an extreme variety of P. eversmanni. In 
this I quite agree with him, but the propriety of separating any 
species in so difficult a genus as this on a single specimen of one 
sex is in my mind most questionable. 
Ménétries says that the pouch of P. wosnesenskii is very large, 
nearly like that of P. mnemosyne, of a dirty white, with a longi- 
tudinal groove below, and another on each side; but on examining 
his type specimen, which is in very bad order, I noted that the pouch 
seemed rather like that of P. clodius (of which, however, no speci- 
men was available for comparison) than like that of P. mnemosyne. 
P. cLopivs. 
Parnassius clodius, Mén. Enum. p. 73 (1855); W. H. Edw. 
Butt. N. A. i. p. 18, t. 4. figs. 5, 6. 
Proc. Zoou. Soc.—1886, No. IV. 4 
