44 



GUIDE TO INSECTS. 



The Lepidoptera are usually divided into two great groups, 

 LEPIDOPTERA HETEROCERA and LEPIDOPTERA EHOPALOCERA. 



The Heterocera or Moths generally have the hind wing united to 

 the front wing by a " frenulum," which hooks into a strap on the 



Fig. 44. 



Wall- 

 case 8. 



Wings of Deaths-head moth, underside, 

 a, Strap which holds the frenulum ; b, frenulum. 



under side near the base of the front wing (fig. 44). They have 

 very various antennse, generally long, slender and tapering to a point, 

 often fringed and frequently comb-like. Comparatively few have 

 them thickened towards the tip. 



The Rhopalocera or Butterflies have the antennae terminating in a 

 club. This is very variable in shape and extent and is sometimes very 

 slight. The hind wings are not united to the front ones by a 

 frenulum. 



The Heterocera are divided into numerous families. The drawings 

 and explanatory labels are in course of preparation, and will be placed 

 in Table-cases 38-41. 



In Table-case 40 will be seen a series of specimens illustrating 

 the life-history of the common Mulberry Silk-moth, Bombyx mori. 

 This species has been cultivated for so many centuries that its origin 

 is uncertain, but it is probably a native of China. 



On a shelf on the east side of the gallery are models and drawings 

 illustrating the habits of various species, many of them of interest on 

 account of the injury they do to fruit trees, &c. 



In Wall-case 8 on the west side of the gallery are some interesting 



