STJPERFAMILY TINEOIDEA 111 



pillar works is made of but one single continuous thread which it 

 fixes and attaches at various places. 



Here follows a detailed description of the method of weav- 

 ing the net, illustrated by a diagram. Then De Geer con- 

 tinues: 



When the two halves of the cocoon have been joined together 

 the caterpillar lines it all over with a good layer of silk which 

 closes all the openings of the meshes formed by the threads between 

 the ribs; so that in the cocoons which are all finished, one can no 

 longer see these meshes so prettily arranged. 



The caterpillar at the same time makes a floor for the cocoon. 

 It covers with a layer of silk the part of the leaf on which the co- 

 coon is placed so that it finds itself surrounded on all sides by 

 walls of silk. 



Thus wrote this good Swedish observer nearly tw r o cen- 

 turies ago; and more recently naturalists of our own have, 

 like him, discovered Bucculatrix larvae in the beginning of 

 their labors and have watched the process with eager interest. 

 Though the cocoons of our natiye species vary in minor 

 points of color, size, number of ribs and the like, the general 

 method of construction is essentially the same. Chambers 

 (1882) described the construction of the cocoon of Buccula- 

 trix ambrosiaefoliella as he observed it under the microscope, 

 and he gives a figure to show the way the ribs are built up 

 which is very like that of De Geer. Mr. James Fletcher 

 watched the cocoon of Bucculatrix canadensisella from its 

 beginning and described its construction in detail. Slinger- 

 land and Fletcher (1903) described and illustrated in fullest 

 detail the cocoons and cocoon making of Bucculatrix pomi- 

 foliella. 



The pupa. The pupae are rather short with a projection 

 in front for piercing the stout cocoons. The appendages 

 are not soldered to the body wall. The abdominal seg- 

 ments 3 to 7 in the male, 3 to 6 in the female, are movable 



