THE CANADIAN ENTOMOLOGIST 65 



Werneburg (Stett. Ent. Zeit., vol. XIX, pp. 49-57, 1855) 

 shows, I believe for the first time, that citrata Linne is related to 

 truncata. In Linne's original description of citrata, he speaks of 

 the fore wings having a grayish central band, with a variegated 

 outer margin and reddish \eIloW costal spot. Dysstroma citrata 

 Linn, with its variations appears to be our American form, and 

 truncata Hufnagel, though closely resembling it, is quite distinct. 

 There is much doubt also as to the occurrence of truncata Hufn. 

 in South America, as I have never seen authentic specimens of it. 



I shall use the term aberration in this paper in place of variety in 

 conformity with the practice of the European specialists, while 

 variety will be employed in the sense of local race. 



The typical Z)_y55//'owa citrata Linn., or gray form with varie- 

 gated outer margins, seems to be rare, and is only found in cold 

 climates and high altitudes. Our commonest form, which generally 

 stands in collections as Dysstroma truncata Hufn., is D. citrata 

 Linn, aberration punctum-notata Haworth, with the central band 

 of the fore wings clear white. In Dyar's List, page 28L the 

 aberrations of truncata Hufn. and citrata Linn, are badly confused, 

 but I shall only consider citrata here; so the rest may be referred 

 to truncata. Dysstroma citrata Linn., and its aberrations may be 

 listed as follows: 



I. Dysstroma citrata Linne. — Fore wings with a gray central 

 area, variegated outer margin with reddish yellow costal spot. 



This appears to be rather a rare form, probably occurring 

 in the mountainous regions and colder climates. The central 

 band ot fore wings is even, uniform gray, with enough variegation 

 in the outer margins not to be unicolorous. I have this form, if I 

 have identified it correctly, from Atlin, British Columbia, collected 

 by Mr. Anderson. The gray form taken in the East is not exactly 

 the same, but I will place it here tentatively until more is known 

 of the group and the genitalia can be studied. I have not seen 

 aberration fusca Prout (Trans. London Ent. Soc, part XVIII, 

 p. 50, 1908), which is unicolorous dark gray without variegations, 

 but I hardly think it applies to the forms mentioned above. 



Ab. (a) punctum-notata Haworth (Prod. Lep. Brit., p. 26, 



1802). 



