340 LÉPIDOPTÉROLOGIE COMPAREE 



sions and the lines on ail the wings are more linelike than in 

 the other forms and this character in the second Une in the 

 hindwings, is of great utility in distinguishing this insect from 

 its congeners. The veins are not outlined in black. The shape 

 of the wings is quite différent from that in alpina and italica, 

 for the forewings in this, in proportion to the hindwings, are 

 much shorter. In the hindwings, the inner margin is not strikingly 

 less than the costal margin, so that the upper angle does not 

 project as far as in italica, but is even rounded and turned in 

 toward the base. The termen of the forewings too, is more 

 rounded than in italica. 



The thorax is grey, slightly brown mixed, and is not vcry broad 

 whilst the abdomen is brown with paler hairs. 



The antennae (PI. D) are shorter than those of italica and, 

 while more strongly pectinated than those of alpina, are less so 

 than in italica. The pectinations too, are thinner. The antennae 

 are not pectinated to the apex; for five joints possess no pectina- 

 tions, whilst, on the four before thèse, those on the inner side are 

 much shorter than those on the outer side. 



The genitalia come next (PI. C, No. i8). 



The valves are of a totally différent type from the others. 

 Thcy are very broad. The edges are parallel, the upper side bcing 

 slightly hollow and the lower convex. Instead of having a tcn- 

 dency to being hooked at the extremity, they are evenly rounded 

 like the end of one's middle fingcr. They are actually broader 

 toward the end than in the middle. Tlie costal ridge is broad 

 and is weakly defined. 



The gnathos is broad, and squamous and is rounded at the tip. 

 It is much more like that of alpina than that in italica but is only 

 slightly indented, not notched at the base. 



The oedeagus is shorter and stouter than in italica and, as in 

 that species, the vesica lacks cornuti. 



