OF WASHINGTON. 



69 



wing rapidly. The best way of capturing them was to place 

 our umbrellas on the ground close to the tree and to jar the 

 latter with a heavy stick. Some forty or fifty specimens were 

 thus brought down on the umbrella, and, though most speci 

 mens escaped, I secured a good series of both sexes. The males 

 are at once distinguishable from their smaller size and more 



FIG. 4. Cylapus tenuicornis Say (original). 



elongate form, aside from the differences in the last abdominal 

 segment. Larvae and pupae occurred in company of the 

 imagos, but no eggs could be found in spite of diligent re 

 search. The bark of the tree was covered with lichens, moss 

 and small fungi, from which the insect probably derives its 

 nourishment. The species continued to be abundant on the 

 same tree up to the last week of August, when they gradually 

 became scarcer. 



Mr. Schwarz exhibited specimens of Choragus nitens found 

 on the small dead white oak on which Mr. Heidemann's Cap- 

 sid occurred, and remarked that this species had hitherto been 

 found but once, viz : at Lowell, Mass., by Mr. Blanchard, and 

 is therefore an interesting addition to the fauna of the District. 

 It breeds in the soft wood directly beneath the bark, and pos 

 sesses considerable leaping power. The same oak tree yielded 

 a specimen of an undescribed genus allied to Xenorchestes. 



In response to a question by Prof. Riley regarding the leap 

 ing Rhynchophora, Mr. Schwarz said that the genus Orchestes, 



