7'( ; A- T RIGID. -E~TOR TRIX. , 5 q 



thmiigli Central Europe, Northern Italy, Sardinia, Sweden, 

 Dalmatia, Greece, Asia Minor, Eastern Siberia, and Japan. 



3. T. decretana, r/.— Expanse of male f, of female 

 I inch (18-22 ni.m.). Fore wings of male bright purple-red, 

 of female dull reddish-brown, each with two darker costal 

 triangular spots. 



Antennte of the male simple, red-brown ; palpi, head and 

 thorax dull red-brown ; abdomen whitish-brown. Fore wine's 

 truncate, the apex produced, costa strongly arched to the 

 middle; bright chestnut-red or purple-red, paler behind; 

 costal fold narrow ; all the space beneath it, except a deep 

 chestnut basal blotch, delicately outlined and tinted with 

 silver-grey to the dorsal margin ; central band rich velvety 

 red-brown, very oblique, constricted in the middle so as to 

 form a costal triangle, and again close to the dorsal margin ; 

 this is followed on the costa by another dark red-brown 

 triangular spot ; hinder area plain ; cilia concolorous. Hind 

 wings silky white shaded with dull brown ; cilia dusky white, 

 Female larger ; fore wings broader, without fold and with 

 more produced apex; dull chestnut-brown, much reticu- 

 lated with darker brown, and having the two costal triangles 

 distinct, of a darker brown ; hind wings as in the male. 



Undersides of the fore wings in the male leaden-brown, 

 with the costa and hind margin fulvous; of hind wino^s 

 greyish-white tipped with fulvous ; in the female fore wings 

 whitish fuscous, with a black line on the hinder cilia ; hind 

 wings white, reticulated with fulvous. 



Variable in the male in the depth of colour, the rich dark 

 colour of the markings being, in some specimens, extended 

 widely over the fore wings, while in others it is almost 

 absent, all being then of the colour of the females. 



On the wing in July and August. 



Larva active, of moderate thickness, tapering slightly 

 toward the anal extremity, and somewhat flattened beneath, 

 dorsal region yellowish-brown or greenish-brown, a little 



