146 THE CANADIAN ENTOMOLOGIST. 



differed slightly from the true prceangusta in being a little larger and 

 darker, with a slightly different arrangement of the colors, my supposed 

 prceangusla differed still more from it in the opposite direction, being 

 smaller, with less of the dark colors and also in a slightly different 

 arrangement of them. The European specimens were between my sup- 

 posed pnTa/igusta and my CleinenscUa from Colorado, but nearer to the 

 latter. I have no hesitation in referring my Clcmcnsella to the true pra- 

 angusta\ and I feel very strongly inclined to refer my supposed prceaiigicsta 

 also to that species, notwithstanding that two out of six specimens of it 

 agree closely with Zeller's description of B. striolata, described by him 

 from Texas. I have not been able to recognise any of my specimens in 

 Dr. Clemens' description of B. salicipomonella, though those that agree 

 most nearly with the European pi-ceangiista agree also best with Dr. 

 Clemens' description of salicipoinonella. In his edition of the Clemens 

 papers, Mr. Stainton, who had seen both salicipomanella and the European 

 prceaiigiista, says nothing about the question as to whether the forms are 

 distinct, and gives Dr. Clemens' account of salicipovioiieUa without com- 

 ment. Nevertheless, from correspondence with him, I infer (perhaps 

 unwarrantably) that he is not altogether convinced that they are distinct 

 species. 



In Vol. 8 of the Canadian Entomologist, p. 171, I have described 

 under the name of Asychna ? pnlvcUa (with the statement that it was not 

 by any means a true Asychna) a species which was taken on willow trees 

 in Kentucky, and which approaches nearly B. striolata Zell. and the form 

 from Colorado which I first referred, as above stated, to prceangusta. In 

 these specimens the fore wings are sordid or yellowish white, dusted with 

 fuscous, with a brown streak on the fold, another on the disc and a white 

 spot at the end of the cell ; another specimen taken in Kentucky since 

 then has the streak on the fold and a brown spot at the end of the cell — 

 none on the disc. My Kentucky specimens measure from 4)^ to 5 lines 

 alar ex.; those from Colorado that I referred to pmangusta {= striolata 

 Zell.) measured 5 lines; Mr. Stainton gives 5^ lines as the alar ex. of 

 salicipomonella, and 7 as that of the true prceangusta. Zeller gives — as 

 that of striolata; and the specimens from Colorado which I named 

 Clemensella, but now refer to prceangusta, measured a little over 7 lines. I 

 doubt greatly whether all are not referable to a single species, prceangusta, 

 or at most to only two, which are best represented by prceangusta and 

 striolata. 



