LEPIDOPTERA 



i93 



finger-like organ, which is stiffened by a branch of the third anal vein, 

 and which projects beneath the costal margin of the hind wing. As 



Fig. 332. — Sthenopis purpurascens. 



the greater part of the inner margin of the fore wing overlaps the hind 

 wing, the hind wing is held between the two. This is the type of pos- 

 terior lobe of the fore wing to which the term jugum is applied (Fig. 333). 



Fig. 333. — Wings of a hepialid, seen from below; a, accessory vein. 



The larvae are normal caterpillars and furnished with sixteen legs; 

 they feed upon wood or bark, and are found at the roots or within the 

 stems of plants. They transform either in their burrows, or, in the case 

 of those that feed outside of roots, within loose cocoons. The pupae have 

 transverse rows of teeth on the abdominal segments; these aid them in 

 emerging from their burrows. 



This family is represented in our fauna by two genera, Hepialus and 

 Sthenopis. 



