PAPILIO VII. 
lular spots disappear almost entirely. The single female Hippocrates examined 
has the yellow area very much restricted on upper side, all the discal spots on 
primaries being separated by wide black spaces, and the basal area is black to 
middle of cell; so is the space between cell and lower branch of median nervure 
to both margins, except a small yellow triangle at the extremity. Theie is the 
same absence of black in cell beneath primaries as in the male. All of both 
sexes have the black border of primaries scarcely, if at all, dusted yellow, and 
all show the blue lunule meeting the fulvous anal spot with no intervening color; 
on secondaries beneath, the black portion of the border to hind margin is very 
much less dusted than in Machaon, in which species the black area is usually 
hidden by the yellow scales, and the blue spots stand in the middle of the black, 
on each interspace. 
Much of Felder’s description will apply to Oregonia as contrasted with Ma¬ 
chaon; but the former differs from Hippocrates in several particulars. In Ore¬ 
gonia the yellow discal spots of primaries are larger, the black intei veiling 
spaces being narrower than in Hippocrates, and the yellow spots in the cell are 
both much smaller; the yellow area is broader on secondaries, and as in Machaon 
and Zolicaon ; on the under side there is much more black in the cells, which is 
about as in Machaon ; and the tails are shorter, narrow, and not sub-spatulate. 
These are between Machaon and Hippocrates in length and shape, and precisely 
as in Zolicaon. In both my $, the length of the tail measured on posterior side 
is .32 inch; the three Hippocrates show .44, .48, and .54 inch, respectively. 
In fact, Oregonia is nearer to Zolicaon than to either of the others. A large 
female of the last named species in my collection, expanding very nearly four 
inches, which is unusual, placed side by side with one of the female Oregonia, 
cannot be distinguished from it by the appearance of the upper side, except by 
the round and separated black spot in the fulvous anal spot, while in Oregonia 
the corresponding black spot is a continuation of the black stripe which edges 
the inner margin, turned in and thickened so as to have an oval shape rathei 
than round. On the under side I can see no difference, except that the same 
black spot is present in Zolicaon, and the cell of primaries is wholly black, with 
a terminal and central yellow spot. There is a marked difference, however, 
between the bodies in these two species, in Zolicaon the whole abdomen being 
black, with only a yellow side stripe, whereas in Oregonia the body is yellow, 
with black on dorsum and with four narrow black stripes on sides and beneath, 
just as in Machaon. Oregonia bears much the same relation to Zolicaon which 
Hippocrates bears to Machaon. In the same district with Oregonia, Machaon 
also flies, of the same type with the Hudson’s Bay and Alaskan examples, which 
are very like Var. Asiaticus, Menetries. 
