712 



AN INTRODUCTION TO ENTOMOLOGY 



scMAs> 



The larvae 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 

 arcudia. The typical 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 siculifer. 



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

 is Eudeilhiia 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. 



2dA 



Fig. 908. — Wings of Or eta 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 frenulum-losing moths, having the hiimeral angle of the 

 hind wings greatly expanded so that a frenulimi 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 ver\^ 

 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 



