14 U.S. NATIONAL MUSEUM BULLETIN 261 



If this is not done, eventually there will be damage to the labels and 

 the pin, and ultimately to the preparations. 



In preparing the wings for illustration, the most satisfactory method 

 is to prepare a dry mount on a microscope slide. A large, square 

 cover glass with a very small amount of a quick-drying adhesive at 

 each corner is used to hold the wings in place. If too much adhesive 

 is used, however, it will run vmder the cover glass to the wings and 

 cause difficulties in following the course of the veins. 



Illustrations 



The illustrations were made with the aid of a camera lucida, either 

 by the author or by Mrs. Judith Stewart under his direction. A number 

 of the illustrations made by the author were inked by Miss Gillian 

 M. Day at the British Museum (Natural History) and by Miss Patricia 

 Thompson of Raleigh, N.C. Since most of the species have good 

 qualitative characters, no attempt has been made to indicate the 

 scale of the drawings. The technique used to prepare the structures 

 for illustration has been discussed in detail by Young and Beime 

 (1958a:3). 



The figures in the systematic portion of this work are lettered uni- 

 formly, as follows : 



a, anterior dorsum (head, pronotum, and occasionally the scutellum), in 



dorsal aspect; 



b, same structures as in a, in lateral aspect ; 



c, male pygofer and plates (setae of plates usually not shown), lateral aspect; 



d, one male plate, ventral aspect; 



e, one style and the connective, dorsal aspect ; 



f, aedeagus, lateral aspect; 



g, aedeagus, caudoventral aspect; 

 h, male paraphyses; 



i, female abdominal sternum VII. 



These explanations are not repeated hereafter in the legends to the 

 figures. Additional structures illustrated are not lettered consistendy 

 but are explained in the respective legends. When the relationship 

 of one of a pair of bilateral structures to its complement is important, 

 the location of the median line has been indicated by a broken vertical 

 line. It should be added here, as a precaution to the reader, that the 

 oudine drawings "a" and "b" were, for the greater part, not made 

 with the intent of publishing them, but only as an adjunct for the 

 writer's own use, to supplement other characters. They are published 

 as a result of the urging of Dr. James P. Kramer, of the U.S. Depart- 

 ment of Agriculture, who insisted that they would be of great assistance 

 to a reader, even if not as accurate as the other illustrations. 



