64 THE CANADIAN ENTOMOLOGIST 



helped me liberall>- in this, and lent me, alonu, ^vi^h other speci- 

 mens, his sordida 9 co-type. 



There remains yet another well-marked form of thanatologia, 

 not included in any of the above descriptions, which I now describe 

 as follows: 



Var perfida, \ar.no\-. Head, collar, thorax and primaries even 

 dull mahogany brown. A paler shade appears at the base below 

 the median \ein, sometimes pale sienna brown, sometimes greyish 

 ochreous. This is usually very faint, diffuse, sometimes extending 

 to the inner margin and sometimes taking the form of an ill-defined 

 basal streak, extending to the outer extremity of the claviform. 

 In some specimens the' cross lines are barely indicated, and are 

 rarely very distinct. The defining geminate portions may be just 

 perceptibly darker than the ground, but they may be traceable 

 only by the slightly paler filling of ochreous or sienna brown. 

 Basal half line outwardly crenate in the interspaces. T. a. line al- 

 most upright, outwardly crenate in the interspaces. T. p. line 

 with the outer portion obsolete, inwardly crenate in the inter- 

 spaces, evenly outcurved over the cell, direct from veins 3 or 2 

 to inner margin. S. t. line indicated by a slightly paler shade, of 

 the same colour as the filling of the other lines and the basal shading. 

 The veins are sometimes just perceptibly darker, and there are 

 sometimes faintly pale intervenular streaks preceding and of the 

 same shade as the subterminal line. Claviform faintly indicated 

 by ochreous scales. Orbicular absolutely concolorous, round or 

 oblique, very narrowly ringed with pale ochreous grey, incomplete 

 superiorly. Rcniform moderate, pale ochreous, incompletely 

 paler ringed, with an irregular filling of the ground colour, which 

 is very slightly darker inferiorly. A very fine terminal darker line 

 occasionally present, as is also a slightly paler line at the base of 

 the fringes, which are the least shade paler than the ground colour. 

 Secondaries not differing at all from other named forms of the species, 

 dull fuscous, or faintly ochreous, white, dark fuscous outwardh, 

 fringes whitish. 



The number of specimens now before me to which this descrip- 

 tion applies is ten, all females, and I have never yet seen a male 

 approaching this form. Localities: — Alberta: Calgary (6, 1 bred); 



