622 



AN INTRODUCTION TO ENTOMOLOGY 



Fig. 762. — Wings of ElacJiista guadrella. (After Spuler.) 



the mine and weave a slight web from which the pupa hangs sus- 

 pended, Hke the pupa of a butterfly. 



This is a small 

 family ; most of our 

 species belong to 

 the genus ElacJnsta. 



Family 

 HELIOZELID^ 



The antennae 

 are from one-half to 

 two-thirds as long 

 as the front wings; 

 the scape is short 

 and not enlarged 

 so as to form an 

 eye-cap. The wings 

 (Fig. 763) are lan- 

 ceolate; in the hind wings there is no discal cell, owing to the coales- 

 cence of the radial sector and media for nearly the entire length of the 

 wing, vein Rs sep- 

 arating near the 

 apex of the wing. 



The habits of " 



the larvae are well- 

 illustrated by the 

 following species. 



The resplendent 

 shield -bearer, Cop- 

 todisca splendorif- 

 erella. — This spe- 

 cies infests the 

 leaves of apple, 

 pear, quince, thom- 

 apple, and wild 

 cherry. The larva 

 is both a miner and 

 a case-bearer. It at 

 first makes a linear Fig 

 mine; but later this 

 is enlarged into a 



blotch mine. When full-grown the larva makes an oval case cut 

 from the walls of its mine and lined with silk. It then seeks a safe 

 place in which to fasten this case. This is usually on the trunk or 

 on a branch of the infested tree (Fig. 764, d). There are two genera- 

 tions annually. The second generation pass the winter as larvae 



^^ 



763- 

 ler.) 



Wings of Antispila pfeifferella. (After Spu- 



