June-Sept., 1919-] DAVIS : ClCADAS. 207 



cult to distinguish the insect. After ten minutes or more of silence 

 it flaps its wings spasmodically and accompanies the manoeuvre with 

 a low rattling sound; after that the song starts monotonous and 

 strident." The cicadas commence to sing about 9 in the morning 

 and continue until about 5 o'clock in the afternoon or even later. In 

 catching the insects Prof. Stohr states that he got the best results by 

 enveloping his hand with a net used for taking minnows, the narrow 

 meshes of which would coop up the cicada and prevent it from slip- 

 ping through the fingers. 



In addition to those already mentioned the following specimens 

 of canadensis have been examined: Sudbury, Ontario, 1893, female, 

 Davis collection; Hymers, Ontario, June 26, 1913, male, and male 

 without date (H. Dawson), Davis collection; Nipigon, Ontario, July 

 9, 1907, male and female (Dr. Skinner), Academy Nat. Sci. Phila- 

 delphia. Niagara Falls, N. Y., female, Am. Museum Nat. History; 

 Schoharie, Schoharie Co., N. Y., June 14, 1918, male (H. Notman), 

 Notman collection; Enfield Falls, N. Y., August 3, 1901, collection 

 University of Minnesota. Charter Oak, Huntingdon Co., Pa., July 

 11, 1917, male and female (J. N. Knull), Davis collection. Through 

 the kindness of Prof. F. M. Gaige, we have been able to examine the 

 following from the collection of the University of Michigan: Porcu- 

 pine Mts., Upper Michigan, Aug. 13, 1904, male (A. G. Ruthven) ; 

 Isle Royale, Michigan, 1878, three males. 



Okanagana tristis Van Duzee. 



1915. Journal N. Y. Ento. Soc, xxiii, pp. 26, 35. 



In the original description based on specimens from Northern 

 California it is stated that, "The elongated form, somber black color 

 and fulvous venter will distinguish this form." It is also quite a large 

 insect. As in occidentalis the notch in the last ventral segment of 

 the female is double, but in addition to being differently colored, it is 

 larger than occidentalis and has narrower wings. 



Specimens have been examined as follows : 



California. — Dunsmuir, July 20, three males (Dyar and Caudell), 

 U. S. Nat. Museum; Keddie, Plumas Co., 3,500 ft., June 29, 1918, 

 female and July 7, 1918, female (F. M. Jones), Davis collection; 

 Plumas Co., June 16, 1913, male (Nunenmacher), Davis collection; 

 Eldridge, Sonoma Co., paratype, female, Davis collection; Eldridge, 



