THE CANADIAN ENTOMOLOGIST. 47 



"profusely irrorated with brownish scales," If further examination of 

 Walker's type in the British Museum should show that it has a costal 

 fold — the description states it is a S — refusatia would fall as a synonym 

 o( circulana, and leave our present species without a name. 



" Thiodiatriangidana, %-^.rios. — Head and palpi cinereous or ashy- 

 white, latter fuscous outwardly, thorax same, but posterior ends of scales 

 and patagia cinereous. 



Front wing divided into three nearly equal triangles, by two oblique 

 fasciae ; the inner from dorsum at first quarter continuing obliquely two- 

 thirds across the wing, the outer from centre of costa to anal angle. 



Costa almost straight ; outer margin oblique, 45°, straight in three 

 specimens, very slightly concave in the fourth ; dorsal margin evenly 

 convex. III. and IV. of hind wing stalked from two-thirds to four-fifths, 

 length of stalk is not constant. 



Fore wing : Ground colour varies from dead white to white with an 

 olivaceous tinge, with olivaceous-brown fasciae, spots and irrorations. An 

 inner narrow fascia arises from inner fourth of dorsum and points towards 

 the inner of the three pre-apical costal spots, but ends abruptly just above 

 middle of wing ; it is more sharply defined outwardly than basally, and 

 its outer margin is indented just above dorsum. The basal triangle 

 within this fascia is thinly irrorated with the dark colour, more concentrated 

 in a narrow line on costa, extending nearly to outer fascia and along the 

 dorsal margin ; below and paralleling the costa are a row of dots, dupli- 

 cated in a shorter row below middle ; between these are three faint 

 horizontal lines, the lower one the most distinct, and in some specimens 

 continuing outward, defining upper end of inner fascia, through outer 

 fascia and ocellic spot. The outer fascia begins on costa and terminates 

 in anal angle, before and defining ocellic spot ; its inner edge is less 

 sharply defined than its outer, and is nearly straight, being sharply 

 indented below middle by a narrow spur of white ; the outer edge curves 

 outward as far as middle of wing, and below is sharply indented by the 

 white ocellic spot. The basal triangle, thus enclosed, is crossed hori- 

 zontally by faint lines of the dark colour, between the veins, the latter being 

 white ; the dark colour forms a shade along the dorsum and in one (the 

 freshest) example a small spot on dorsum at outer two-thirds. 



