LEPIDOPTERA. 197 



(Fig. 171), which is found in the month of July is sub- alpine 

 regions ; the Chionobas aello (Fig. 172), which is found in the 

 Alps of Switzerland, of the Tyrol, and of Savoy, and which is 

 common enough, in the month of July, on the summit of Montan- 

 vers, near the mer de glace ; the Satyrus ''anira, or Meadow brown 



Fig. 173. Meadow brown (Satyrus (Hipparchia) janira). 



(Fig. 173), which is very common, in the months of June and 

 July, in woods and fields. 



We now pass on to the second section of Lepidoptera. 



It contains those whose flight in the majority of species is nocturnal 

 or by twilight, but by day in some species. The antennae are more 

 or less swollen out in the middle or before their extremities, and, 

 independently of that, sometimes prismatic, sometimes cylindrical, 

 sometimes pectinated or indented. The body, which was small in 

 comparison to the wings, and which was remarkably thin between 

 tJie thorax and the abdomen in thejirst section of Lepidoptera, is 

 in this section very much larger in proportion to the wings, and is 

 not drawn tightly in between the thorax and the abdomen. The 

 wings are horizontal or slightly inclined when the insect is at rest ; the 

 upper then cover the lower, which 

 are generally comparatively short 

 and kept back by a bridle on the 

 jirst, in the case of the males only. 



We will take the genus Sesia 

 as the representative of the 

 Sesiidcs. These singular insects 

 have membranous wings, and re- 

 semble various species of Hyme- 



mi , . Fig. 174. Sesia apiformis. 



iioptera. The largest species is 



the Sesia apiformis (Fig. 174), that is, bee-like, which is found 



