64 rUOCEElUNdS OF THE NATIO\.\L MUSKI^M. 



pointed out difTor strongly from popuU. I Ijave selected this species ns 

 tlio type of GnciK'e's desciriptioii, hcciuise it is, without iiiiy doubt, 

 included by liini in his chiiracteriziiticMi. It is also quite certain that 

 Ki ley had both forms before him wlien he described his species; so, 

 sti'ictly speakiiif*', the nanu^s rer<u')'('(l to the same as^i"ej;ation of exam- 

 ples. As there are two forms, however, and as Kiley's (i<;ure and type 

 refer distinctly to the form in which tlie basal streak is very short, it 

 seems fair to r<',tiiin his name and to apply (luenre's term to the other 

 form, which has been mixed with it, ()n(H)tlier j)oint that was not men- 

 tioned in the descrii)tion of the precedinj? species as distinguishing' it 

 fiom the one now under consideration is that here the transverse ante- 

 rior line is in almost c^very case moie or less evident, and yet distinctly 

 geminate. In no example of populi do we iind any approaching to this. 

 The si)ecies is, on the whole, narrower winged, and as it is also more 

 coarsely bhujk i)owdeie(l it has (piite a distinctive ai)])earance. in male 

 genital charactej-s it does not differ essentially from (he jireceding; but 

 the side pieces are rather narrower as a whole, while the clasper is 

 shorter and proportionately very much broader. 



ACRONYCTA CINDERELLA, ik w Hpccies. 

 (Pliit<w XI, (i^. II, iiiiilo adult; \X, (iJ,^ 1, inalo jionitalia.) 



Ground color very pale ash gray, almost whitish, but with coarse 

 black powderings, which give it the ashen appearance. Head and 

 thorax of the ground color as is usual. The primaries have the ordi- 

 nary nrarkings rather imperfectly written. The basal line is marked 

 by a small black dot on the costai, very close to the base. The trans- 

 verse anterior line is nu)re or less complete; in one case entirely dis- 

 tinct, but in most instances only i*artly defined. It is always geminate, 

 however, so far as it is obvious. In the worst case it is marked by a 

 distinct costal s[)at, by a pair of angulated marks below the (;ell, and 

 by a pair of spots on the internal uuirgin. A black spot over the 

 reniform marks the origin of the median shade, which is not traceable, 

 however, beyond tlnit i)()int. The transverse ])osterior line is continu- 

 ous in all the specimens, usually lunulated and sonu^times (piite strongly 

 dentate on the veins. It may or may not be emphasi/A'd oi)posite the 

 cell; but is always marked opposite the anal angle where there is also 

 a slender black line crossing it. The terminal si)ace is a little darker 

 than the rest of the wing. There is a series of black terminal dots, 

 beyond which the wings are cut by blackish marks. The basal streak 

 is distinct for half its length, and beyond that lessens to a narrow line 

 which reaches the transverse anterior cross line. This difference in the 

 strengtli of the line is noticeable in all the specimens. The orbicular is 

 marked in all the specimens, irregularly oval and black ringed. The 

 reniform is a dusky, indelined lunule. Seccmdaries white, with the outer 

 margin a little soiled, a series of blackish terminal marks beyond wliich 

 the fringes are cut with dusky. On the under side the wings are white 



