40 JouRNxVL New York Entomological Society. [^^°'- xxiii. 



genital characters of these species scarcely differ. Dr. J- C. Bradley 

 took this species in Humboldt Co., Calif., in June, the California 

 Academy of Sciences has an example taken by U. C. Stevens in Coos 

 Co., Oregon, in June, and Dr. Wilson sends me specimens from 

 Oregon taken at Marysville and Corvallis in June and July. It was 

 described from Utah. 



29. Okanagana triangulata Davis, ante. 



This is our largest species of the synodica group. It has promi- 

 nent rounded supra-antennal plates ; the basal areole of the elytra is 

 decidedly narrowed to an obliquely rounded apex ; the pale hind 

 margin of the pronotum is rather broad, the disk of the mesonotum 

 is black with the four pale spots small. The abdomen is pale with a 

 large triangular black basal spot on the tergum reaching the sides 

 at base and attaining the anteapical segment and there is a row of 

 black marks along each side. The last ventral segment is rather 

 narrow at apex and almost truncated; valve long; uncus oblong, 

 parallel sided, its apex slightly curved above with an arcuated notch 

 beneath. 



Mr. Davis has kindly sent me for examination a male type taken 

 by Mr. Nunenmacher in ]\Iendocino Co, in May. 



30. Okanagana mercedita Davis, ante. 



This is a smaller species than the preceding Avith which it agrees 

 in having rounded supra-antennal plates. The basal areole of the 

 elytra is oblong and square at apex. The colors are clearer than in 

 the preceding species with the pale areas inclined to fulvous in places 

 and more extended. The abdomen is black above with the hind edge 

 of the segments very narrowly paler; the venter is pale with the 

 discal base of the segments blackish and there is a black spot on either 

 side of the last ventral segment of the female ; the hind margin of this 

 segment is deeply narrowly excavated almost to its base. 



I have seen but a single female specimen, taken in Merced Co., 

 Calif., in June and sent to me for examination by Mr. Davis. 



31. Okanagana synodica Say. 



Say, Complete Writings, II, p. :253, 1825 (Cicada). 



Form ovate and quite strongly narrowed before. Front promi- 

 nent, roundedly angulate when viewed from the side ; stride con- 



