Mr. E. Doubleday on some new Diurnal Lepidoptera. 305 
its original German, but now that it has been translated and widely 
circulated by the Ray Society, it becomes almost imperative on 
me to do so, and to put our English naturalists on their guard 
against this and numerous—I am sorry to say very numerous— 
similar errors, in this and other reports in the same volume. I am 
the more surprised at the error im the case of these species, as I 
believe the information relative to them was given to Erichson by 
an English entomologist who well knew their distinction. 
Erichson states that P. Ganesa is synonymous with P. Arc- 
turus, P. Polyeuctes with P. Bootes, and P. Xenocles with P. Pol- 
luz. Had he ever read the descriptions, he could not have fallen 
into this error. 
P. Ganesa is in both sexes destitute of the splendid blue patch 
on the posterior wings so conspicuous in P. Arcturus, and is far 
more nearly allied to P. Paris than to that species, but differs 
from it in many points besides the downy nervures of the anterior 
wings in the males. 
P. Polyeuctes is much nearer to P. Philozenus than to P. 
Bootes, and may possibly be only a variety of the former, though 
I think its characters are too clearly marked for this to be the 
case. Of the four species in this singular group, P. Polyeuctes 
has the posterior wings by far the narrowest, P. Bootes by far the 
widest. P. Bootes has a large red patch at the base of the wings 
below, P. Polyeuctes has not; P. Bootes has the white spots on 
the disc of the posterior wings of a totally different form, and in 
a different position to P. Polyeuctes. 
P. Xenocles bemg almost a white insect, P. Pollux almost en- 
tirely brown; P. Pollux extending in extent of wing little less 
than double the expanse of P. Xenocles, cannot very easily be con- 
founded. The species nearest to P. Xenocles is P. Macareus ; but 
this is a darker insect, the dark markings extending over a wider 
space, the light colour not being nearly so white; it also wants 
the orange spot at the anal angle of the posterior wings. 
I am convinced that Erichson cannot have seen the descriptions 
of these species, and has been misled by erroneous information 
from England. Other mistakes in his report I shall hereafter 
point out. 
P. Elephenor. P. alis anticis elongatis, supra nigris, viridi irroratis, 
nervulis tribus pubescentibus, subtus pallidis nigro lineatis, posticis 
ovatis elongatis, angustatis, dentatis, nigris viridi irroratis, antice 
cerulescenti nitentibus, lunula anali rufa, subtus nigro-ceruleis, 
lunulis marginalibus rufis, ceruleo irroratis (¢). Exp. alar. 5 unc. 
3 lin. vel 132 millim. 
Hab. Sylhet. 
Anterior wings clongate, triangular, the outer margin about 
two-thirds the length of the anterior, the inner bearing the same 
Ann. & Mag. N. Hist. Vol. xvi. Zi 
