1877. ] BUTTERFLIES FROM DUKE-OF-YORK ISLAND. 147 
29. Pieris QUADRICOLOR, sp.n. (Plate XXIII. figs. 3, 4.) 
3 Exp. 2°6. Above white, both wings margined except on their 
inner border with black; inside the black border and the base of 
the wings greyish: beneath as above, except that there is no grey 
on the inner margin of the black border, and that the basal two 
thirds of the secondaries is yellow; the black border beneath is pure 
and without any spots or markings. 
This appears to be a distinct species from any yet described. It 
belongs to the genus Belenois of Mr. Butler’s arrangement of the 
Pieridze, and is perhaps most nearly related to P. affinis, Voll., from 
Celebes. 
30. CALLIDRYAS CROCALE. 
Papilio crocale (Cr.). 
A single female specimen, apparently of this species. 
PaPILIONINe. 
31. ORNITHOPTERA ARUANA. 
Ornithoptera aruana, Feld. Wien. ent. Monatschr. iii. p. 391. 
Papilio aruana, Feld. Voy. Nov. Lep. p. 3, t. 1. 
Specimens sent by Mr. Brown agree best with our Aru examples 
of O. aruana. They have the same pointed apex to the secondaries ; 
the yellow spots on the same wings, seen in some species of this 
group, are also absent; but the black spot between the first and 
second median branches is absent in three out of four specimens ; 
in the fourth it is quite small. 
In endeavouring to determine these specimens we have had occa- 
siou to examine a tolerable series of the Ornithoptere belonging to 
the O. priamus group ; and our present conclusion is that but few of 
the species sought to be set up have any real specific value, and 
that their number will have to be considerably reduced whenever a 
full comparison of specimens is made. The characters of such so- 
called species as O. triton, O. oceana, O. cassandra, and others, being 
drawn from notoriously variable features, seem to fail in giving spe- 
cific precision to the insects bearing them. 
32. ORNITHOPTERA URVILLIANA, 
Papilio urviliana, Guér. Voy. Coq. p. 273, t. 13. f. 1, 2. 
The original specimens of this fine species were obtained at Port 
Praslin, New Ireland, during the voyage of the ‘ Coquille;’ but from 
that time to the present nothing more has been known of the species. 
Mr. Brown now sends specimens of both sexes, the males agreeing 
accurately with the plate quoted above, the females being hitherto 
undescribed. The males present a slight amount of variation inter 
se, one having the characteristic blue markings rather purer than 
the other, in which a slightly greener tint prevails. But there can 
be no doubt of the complete distinctness of the species, and that, 
whatever may eventually be done with the many races af oat 0.-pria- 
: we 
