THE GENUS P@CILOPSIS. “93 
and Austria. The other species is of more limited distribution, 
for it is confined to the Silesian Mountains and to the Alps of 
Switzerland, Bavaria and the Tyrol. 
It will be seen that I have been compelled to erect a new 
species for the so-called lapponaria from the Alps and Silesia. 
I have tried hard to avoid this necessary split, and to persuade 
myself that the form is but a mountain form of pomonaria, but 
it will not do; there are differences of specific value at every 
stage of its existence—differences greater in many instances 
than those occurring in the case of two obviously distinct species 
like L. hirtaria and P. pomonaria at corresponding points. In 
fact, had one been so inclined, it would have been perfectly 
feasible to break this genus on larval differences, such as has 
been done in other groups, and then find this separation 
justified by imaginal characters. In sucha case lapponaria would 
fall into one subgenus whilst isabelle would fall into the other ! 
After these preliminary remarks, I had intended to take the 
species in detail, but I think it better to give a brief description 
of the Central European form isabelle, and then contrast it, 
in all the salient points, with its nearest ally pomonaria, on the 
one hand, and on the other with lapponaria, with which it has 
been so long lumped. There would be no gain in comparing it 
with rachele, for that insect, although perfectly distinct, is 
sufficiently close to lapponaria to obviate any such comparison. 
Pecilopsis isabelle, sp. n. (=lapponaria, auct. part.). 
Male.—Tone of whole insect much blacker than its congeners. 
Fore wings subhyaline, with the ground area before the second line 
feebly provided with silvery white scales. First, second and median 
lines present, undecided, but fairly broad; median and second lines 
tending to fuse toward the lower margin; second line followed by 
feeble white line. A zigzag subterminal line intersects the more or 
less dark terminal band. Veins, especially those of the cell, black ; 
costal groove black, mixed with orange-yellow scales. Fore wings 
fairly long, rownded at the tip. Hind wings hyaline, except for a 
few white scales at the base. Fringes narrow, black. Antenne black, 
not pectinated to the apex. Head reddish, collar white, thorax and 
abdomen black, with fairly,.broad red median stripe; patagia outlined 
in white. Genitalia, tip of valve rounded. 
Female.—Wings rudimentary, but longer than those of the other 
three species, provided with longish, stiff grey hairs. Body black, 
sprinkled everywhere, like the wings, with orange-red scales, only 
concentrated to form a median line on the thorax; a few scattered 
white scales may be present also; the whole provided with long 
rather coarse hair. Antenne thick, heavily grey scaled, feebly 
pectinated when freshly emerged. 
Types, one male and one female from Innsbruck, Tyrol. 
A table giving the points of difference between this species and 
P. pomonaria and P. lapponaria is appended. 
