202 Annals Entomological Society of America [Vol. XIII, 



The writer desires to acknowledge his indebtedness to 

 Professor R. A. Cooley and Dr. R. R. Parker for many helpful 

 suggestions. 



Specimens for study were first softened in a solution of 

 alcohol, glycerine and formalin. For the study of the wings and 

 legs these parts were removed from softened specimens and 

 placed in 70 per cent alcohol, then in carbolic acid-turpentine 

 clearing solution, and finally mounted in Canada balsam. For 

 the study of the body parts bearing sclerites and sutures it 

 was usually necessary to cut away the parts with a sharp 

 scalpel, boil in a 5 per cent solution of potassium hydroxide to 

 remove non-chitinous tissue, preparatory to mounting in 

 balsam. The head capsule was prepared in the same manner 

 and mounted whole in balsam, in a xylonite ring. Treated in 

 this manner the parts under study retained their normal form, 

 while the bristles, sclerites and regions could be distinctly seen. 



Some specimens were placed in chlorine water until they 

 had been bleached to a light yellow and were almost trans- 

 parent. These were then washed, dehydrated and placed in 

 thin balsam until they were completely filled with the medium. 

 Whole mounts were made in xylonite rings and studied for the 

 various structures. 



Drawings were made from prepared slides with the aid of 

 apparatus consisting of a small arc lamp the light of which was 

 directed through the barrel of a microscope placed horizontally 

 with a mirror attached so as to present a surface to the ocular 

 at 45°. When a slide was placed on the stage of the microscope 

 the image was projected on a paper under the mirror on the 

 table where it could be traced. 



Anatomical Structure. 



The terms used in designating special sclerites, sutures or 

 regions are for the most part those recognized by Dr. Crampton 

 of the Massachusetts Agricultural College. In some instances 

 terminology has been taken from Lowne, or other authentic 

 sources, but since the terms are in common usage, they should 

 cause no confusion. 



