Dec, 19:7.] 



Davis: Sonoran Cicadas. 



207 



also some conspicuous black markings interspersed with the red at the base 

 of the wings. Beneath orange, with what dark markings there are about 

 the head nearly concealed by pruinose and silvery hairs. The transverse 

 rugs are black; the legs are orange conspicuously streaked with black. The 



Tibicen dury'i. 



opercula orange, with the extremities rounded and the inner margins over- 

 lapping. The last ventral segment orange, narrowed and somewhat rounded 

 at the extremity. The valve also orange-colored. The external parts of the 

 genitalia nearly all black. 



Measurements (in Millimeters). 



Male Type. Female Allotype 



Length of body 28. 26. 



Width of head across eyes 10. 9.5 



Expanse of fore wings 73- 74- 



Greatest width of fore wing 11 -5 "-S 



Greatest width of operculum 6. 



Greatest length of operculum 6. 



In addition to the type and allotype the following specimens have 

 been examined : 



Jemez Springs, New Mexico, July 12, 1916, 7,500 ft., female; 

 June 15, 1917, 7,000 ft., female; July 22, 1917, 6,400 ft., male, all 

 collected by John Woodgate. Post Creek Canyon, Fort Grant, Ari- 

 zona, July 17, 1917, female (Dr. Joseph Bequaert). This last is a 

 large specimen with wings expanding 82 millimeters. All of the 

 above are in the author's collection. 



Though this cicada resembles Tihiccn townsciidi and Tibicen 

 bifida, the opercula are not as long as in either of those species, the 



