104 Annals Entomological Society of America [Vol. VI, 



The adult wings shown have been drawn with the aid of the 

 Edinger drawing apparatus and have been selected, for the 

 most part, from adults showing the normal venation. In a 

 few cases, however, wings have been used which show the pres- 

 ence of unusual cross veins or the absence of usual cross veins. 



In spite of the fact that many different methods of mounting 

 were tried, several genera did not yield satisfactory mounts. 

 The most conspicuous genera, in this respect, were Kolla and 

 Tettigoniella. In spite of the fact that several hundred wing 

 pads of these two genera were mounted from specimens collected 

 from early spring to late summer, no satisfactory mounts were 

 secured. Certain species in other genera show this same 

 characteristic. Perhaps the most conspicuous species, in this 

 respect, is Diedrocephala versuta Say. Nymphs of this species 

 can be found in great numbers at Raleigh, North Carolina, 

 throughout the season. Yet in spite of the fact that they were 

 collected in large numbers and treated in many different ways 

 no satisfactory wing pads of Diedrocephala versuta have been 

 secured. 



It is also necessar^^ to secure the nymphs at the proper time. 

 Some little time before the insect molts, the wing is very much 

 crumpled in its sheath. This is especially true of the last molt. 

 This is unfortunate as, in many cases, the older wing pads are 

 necessary for determining the homologies of some of the tra- 

 cheae and veins. As already pointed out by Comstock and 

 Needham '98-'99 the best results can be secured by selecting 

 the paler colored individuals. 



In all twenty-five genera of JassidcE have been studied in 

 the preparation of this paper. These genera represent such 

 forms as could be readily secured in the vicinity of Raleigh, 

 North Carolina. They contain representatives of all of the 

 subfamilies and tribes of Jassidce commonly found in Eastern 

 North America. 



In the course of this study many hundreds of nymphs have 

 been collected and their wing pads studied. It has not always 

 been found possible to remove the wing pads so as to secure the 

 body tracheae. The writer does not consider this important, 

 however, as all of the pads have been removed close enough to 

 the base to assure him of the homologies of the principal 

 trachea. 



