Dec, 1917.] 



Davis : Sonoran Cicadas. 



205 



Fore wings with the costal margins straw-colored to the end of the radial 

 cells, beyond darkened; subcostal veins black; first and second cross veins 

 infuscated. The basal cell of each fore wing contains a conspicuous black, 

 longitudinal mark, with the posterior portion of the cell nearly clear. The 

 flaps of both fore and hind wings are grayish in color. Beneath light straw- 

 colored, with what dark margins there are about the head, nearly concealed 

 by pruinose. The transverse rugae are orange with the sides black and the 

 hollows well filled with white silken hairs. There are also many hairs in 

 the rather shallow median sulcus, and longer ones under the eyes. The 

 legs are straw-colored, inconspicuously touched and lined with black. The 

 opercula, straw-colored with the extremities rounded and the inner margins 



"ib'icen vnauditus. 



not overlapping. The last ventral segment slightly truncate at extremity. 



The valve also straw-colored. The external parts of the genitalia nearly all 



black. 



Measurements (in Millimeters). 



Male Type 



Length of body 23 



Width of head across eyes 9 



Expanse of fore wings 67 



Greatest width of operculum 5 



Greatest length of operculum 5 



In addition to the type, two other males were collected by Miss 

 Mildred McGill during an automobile trip. She writes as follows: 

 " They were collected close to the Ozark Trail, which leads through 

 Glenrio, Tex., to Las Vegas, N. M. As you know it is mostly planes 

 in this part of the country and it was in what is called the Cap Rocks 

 which are pretty high and except for grass are barren on top. But 



