THE GENUS PCECILOPSIS. 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 such a case lapponaria would 

 fall into one subgenus whilst Isabella 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 Isabella, 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 rachelce, for that insect, although perfectly distinct, is 

 sufficiently close to lapponaria to obviate any such comparison. 



Poecilopsis isabellce, 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, rounded at the tip. Hind wings hyaline, except for a 

 few white scales at the base. Fringes narrow, black. Antennas 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.—^ rngB 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. Antennge 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. 



