268 THE CANADIAN ENTOMOLOGIST 



L. E. Marmont, and in his collection; 2 9 's, Rosedale, B. C, June 24th, 1917, 

 Cloverdale, B. C, June 15th, 1917, taken by the author and in his collection; 

 1 9 , Duncan, B. C, June 28th, 1895, E. M. Skinner, and now in the author's 

 collection. 



Dysstroma sobria Swett. form swetti., form. nov. 



In the Can. Ent., Feb., 1917, p. 64 et seq., Mr. L. W. vSwett gave a paper 

 on the genus Dysstroma, in the course of which he described some new abbera- 

 tions, or, as I would prefer to call them, forms of our large Vancouver Island 

 species, which he had at that time identified as mulleolata Hulst. 



There has been considerable doubt as to what Hulst's mulleolata really is, 

 Mr. L. B. Prout, of London, Eng., being the first one, I believe, to associate 

 this large form with mulleolata (vide Trans. Lon. Ent. vSocy., 1908, p. 38). 

 Drs. Barnes & McDunnough in further notes on this genus (Cont. Lep. No. 

 Amer., Vol. 3, No. 4, March, 1917, p. ^228), accepted Mr. Swett's identification 

 of mulleolata, although with a certain amount of reserve, as there were several 

 discrepancies between Hulst's type and his description. Later, (ibid.. Vol. 

 IV, No. 2, May, 1918, p. 137) on an examination of the type specimen by Dr. 

 McDunnough, the authors came to the conclusion, for reasons which are clearly 

 set forth and which seem exceedingly logical, that Hulst's mulleolata is the 

 smaller, white-banded form of citrata L, which Mr. Swett had previously called 

 punctum-notata Haw. This is the form which in favourable years is very com- 

 mon on \ ancouver Island in the month of August. 



Accepting Barnes' & McDunnough's identification of miilleolaui to be 

 correct, (and with which I fully agree) will leave our large, white-banded form 

 without a name. According to the rules of the International Code, the first- 

 named form ,i. e., sobria, given by Mr. Swett, will stand for the group collectively, 

 and I propose to give the name si^etti to the white-banded form, a description 

 of which follows' 



Head, front and palpi, cinnamon brown, thorax the same, intermingled 

 with a few lighter hairs. Primaries, basal area dark brown, followed by another 

 white line, slightly sinuous. The central area is white, irregularly bordered 

 Avith black anteriorly and posteriorly, the posterior portion being wider and 

 more pronounced costally. The amount of white in the central area is some- 

 what variable, especially between the sexes, the females as a general rule hav- 

 ing a much larger proportion of white than the males. The outer border of 

 central area is edged narrowly with white, while contained within the white 

 area is a black linear discal mark. The subterminal area is tawny, shading 

 into dark brown, especially opposite the discal mark, where it appears as a 

 dark diffused blotch. The s. t. line is white, dentate, and rather faint. There 

 is a small, yellowish-white sub-apical mark on the costa. Fringe pale, darker 

 at the termination of the veins. 



Secondaries, dark fuscous with the extra-discal line distinctly outlined in 

 a paler shade and being acutely angled between veins 3 and 4. Black discal 

 dots small but distinct. 



Underneath primaries dark fuscous with central area showing through 

 darker, a large yellowish patch on costa. Secondaries same colour with extra, 

 and intra-discal lines strongly marked. Discal spots reproduced on all wingg 



