338 LEPIDOPTÉROLOGIE COMPARÉE 



suffusions and lines, is not so broad and rarely shows up so well 

 as in alpina. 



The same différences are observable in the lines on the hind- 

 wings but, owing to the différence in shape in the hindwings 

 of the two species, both the médian and second are nearer 

 the base of the wing and are more parallel, with the resuit that 

 very often, the thickened second Ime crosses and oblitérâtes the 

 discal spot. 



In shape the wings are very characteristic. The forewings are 

 markedly longer than the hind ones and the termen is much less 

 rounded than in alpina. In the hindwings, as the upper angle is 

 much projected, the wings are much broader than in either 

 alpina or grœcaria. 



The antennae (PI. D) are very différent from those of either 

 alpina or grœcaria, being very long and having very strong pec- 

 tinations which extend to the apex on the outer side, but are 

 absent for the last four joints on the inner side. The pectinations, 

 as well as being longer, arc thicker and blackcr than those of 

 grœcaria. 



The thorax is broad and is covered with grey fur, whilst the 

 abdomen is brown and is more or less covered with greyish hairs. 



The génital ia (PI. C, Fig. 17) are very distnict. The valves 

 are much longer and broader than those of alpina and the upper 

 margin is not concave as in that species but for 2/5 of its length 

 is straight. There is then a slight dip, followed by a rapid 

 outward curve. The outer margin is very slightly hoUowed. Then 

 it turns upward, not with a bold curve, but with a slightly concave 

 sweep until it reaches the downward curve of the upper margin. 

 The costal ridge is narrow. 



The point of the uncus is very short. The gnathos is smaller 

 and much narrower than that in alpina and, instead of being 

 notched at the base, proceeds outward in a straight line until the 

 curved extremity is reached. It is much more strongly squamous 

 than alpina. 



The oedeagus is short and stout and the vesica is merely 



