712 



AN INTRODUCTION TO ENTOMOLOGY 



/?./?, 



The larvee are remarkable in having the anal prolegs vestigial, 

 and the caudal segment prolonged into a more or less lizard-like tail. 



They live upon the foliage 

 of shrubs and trees, and 

 transform in a web between 

 leaves, or in a case in a 

 rolled leaf. 



Only six species belong- 

 ing to this family occur in 

 our fauna. These represent 

 three genera; the venation 

 of the wings of a species of 

 each of these genera is 

 figured here. 



Our most common 

 hook-tip moth is Drepana 

 arcudta. The t^^pical form 

 of this species is of a dirty 

 white color marked with 

 dark brownish lines, and 

 bands as shown in Figure 

 905. A summer form of 

 this species differs in being 

 of a light ochre-yellow color 

 and in the course of the 

 wavy lines on the front 

 wings; this was described 

 as a distinct species under 

 the specific name gemcula. 

 These two forms are found in the Atlantic States. A third form of 

 this species occurs in California ; this was described under the specific 

 name siculijer. 



Our single representative of this family that is not a hook-tip moth 

 is EudeiUnia herminidta. This is a small moth with delicate snow- 

 white wings, which expands from 18 to 25 mm. The venation of the 

 wings is shown in Figure 906. The larva lives on cornel; the caudal 

 prolongation of the body is very short. This species is found in the 

 Atlantic States. 



Fig. 908. — Wings of Oreta rosea. 



Family LACOSOMID^ 



This family is of special interest on account of the structure of 

 the wings of its members. While these moths clearly belong to the 

 series of frenuliim-losing moths, having the humeral angle of the 

 hind wings greatly expanded so that a frenulum is not needed to 

 insure the synchronous action of the fore and hind wings, they retain 

 a vestige of a frenulum (Fig. 909). This vestige, however, is very 

 small and is probably no longer of any use. It was the presence of 

 this vestige that first suggested to the writer that those families of the 



