638 



AN INTRODUCTION TO ENTOMOLOGY 



mingled with sawdust-like matter. These are the results of the work 

 of the larvae of this insect, which bore under the bark and into the 

 superficial layers of the wood. The adult resembles the female of 

 the peach-tree borer, but the abdomen is more extensively marked 



with orange beneath. 



R^R^R_._R, 



SUPERFAMILY 



TORTRICOIDEA 



Fig. 781. — Wings of Ar chips cerasivorana. 



The Tortricids 



The tortricids are 

 generally small moths ; 

 but as a rtde they are 

 larger than the mem- 

 bers of most of the 

 families of the Micro- 

 frenatas. They have 

 broad front wings, 

 which usually end 

 squarely. The costa 

 of the front wings 

 curves forward strong- 

 ly near the base of the 

 wing. When at rest 

 th^ broad front wings 

 fold above the body 

 like a roof. The moths 

 are variegated in color, but are usually brown, gray, or golden rather 

 than of brighter hues. As a rule the hind wings are of the color of 

 the body and without markings. The venation of the wings of a 

 common species is represented by Figure 781. 



The larvse vary greatly in habits. Many of them are leaf-rolleis. 

 It was this habit that suggested the name Tortrix for the typical genus, 

 from which the names of one family and of the superfamih^ are 

 derived. A large portion of the rolled leaves found upon shrubs and 

 trees are homes of tortricid larvae ; but it should be remembered that 

 the leaf-rolling habit is not confined to this family. While many are 

 leaf-rollers probably a larger number are borers in stems, buds, or 

 fruits. 



About eight hundred North American species of the Tortricoidea 

 have been decribed. This superfamily includes four families, which, 

 can be separated by the following table. 



A. Both veins Mi and IMj of the hind wings lost. p. 644 CARPOSiNiDiE 



AA. Vein Mi of the hind wings present, vein M2 either present or lost. 



B. With a fringe of long hairs on the basal part of vein Cu of the hind wings, on 

 the upper side of the wing. Do not mistake a bunch of long hairs arising 

 from the wing back of vein Cu for this fringe. 



