Dec, I9I7] Davis: Sonoran Cicadas. 203 



Ophiderma mus Champ. 



Ophiderma mus Champ., Biol. Cent. Amer. Horn., Vol. II, pt. i, p. 143. 



This species in nature is unknown to the authors; who by original 

 description and iUustration suspicion that it either belongs to another 

 genus or a new genus must be erected for it. However until speci- 

 mens can be studied it is thought best to retain it in Ophiderma. 



SONORAN CICADAS COLLECTED BY HARRY H. 



KNIGHT, DR. JOSEPH BEQUAERT AND OTHERS, 



WITH DESCRIPTIONS OF NEW SPECIES. 



By Wm. T. Davis, 

 New Brighton, Staten Island, N. Y. 



Mr. Harry H. Knight and Dr. Joseph Bequaert were members 

 of the Cornell University Biological Expedition, organized by Prof. 

 J. Chester Bradley, that started by automobile from Ithaca, New 

 York, in May, and reached California in August, 1917. Both of these 

 gentlemen collected what cicadas they were able to find as the 

 journey progressed, and have kindly turned them over to me. They 

 form an interesting collection and I have been unable to identify two 

 of them with descriptions of species mentioned in Biologia Centrali- 

 Americana, or previously known from the United States. These are 

 here described as new, together with two others from the same gen- 

 eral region that I have from other sources. A new Okanagana from 

 California is also described. 



Of the fourteen species here placed in the genus Tibicen, only the 

 first seven, in the opinion of the author, really belong there. In the 

 remaining seven the uncus is wish-bone shaped instead of simple, and 

 the first cross vein of the fore wing does not, as a rule, start as far 

 back or near to the base of the wing from radius 3, as it does in the 

 species having the simple uncus. The last seven species here referred 

 to, and others of like character, will no doubt in due time be assigned 

 to one of the genera already described, but they do not belong to the 

 genus Cicada, where they would fall in Distant's arrangement by the 

 shape of the head, for Mr. Van Duzee has point,ed out in the Bulletin 



