Sept., 19IS-] Davis: A New Variety of Cicada. 163 



thickened, and the W-mark is prominent, whereas in marginata var. dealbata 

 the fore wings are more acuminate in form, the costal margin is green, 

 darkened beyond the middle of the wing and the W-mark is not conspicuous 



M 



Ciocula. d.OYS,dia. Cicada. yiiaYOLndCa. 

 UC-Y- deOLlbdhx. 



or is wanting. One of the greatest differences between the two insects is in 

 the genitalia. The uncus in dorsata viewed at full face is narrow and the 

 piece below into which it locks is broadly notched with the extremities 

 rounded. In var. dealbata the uncus is more nearly triangular in shape and 

 the lower piece is narrowly notched with the extremities much produced. The 

 male type of var. dealbata is figured. 



Length of body 35 mm. ; length of fore wing 46 mm. ; expanse of 

 wings 105 mm. 



The following specimens are in the author's collection unless 

 otherwise stated : 



Mount Hope, Sedgwick Co., Kans., male (J. C. Warren). Col- 

 lection Brooklyn Museum, N. Y. 



McPherson, McPherson Co., Kans., Aug. 10. 1914, male (W. 

 Knaus). Collection Brooklyn Museum, N. Y. 



Cheyenne Co., Kans., 3,300 ft., male (F. X. Williams). 



Colorado, two males. 



Denver, Col., August 15, 1912, male (Oslar). 



Platte Canon, Jefferson Co., Col., July 25, 1913, male; also male 

 without date (Oslar). 



Chimney Gulch Golden, Col., August, male (Oslar). 



Pueblo, Pueblo Co., Col., female, Aug. 17, 1878, and female 

 without date. Collection of Cornell University. 



Colorado Springs, Col., male, Sept. 3, 1912, male (Oslar). 



Durango, La Plata Co., Col., Aug. i, 1912 male; also male without 

 date (Oslar). 



The name Cicada marginata was preoccupied when Say used it 

 in 1825 by the earlier (1790) Cicada marginata of Olivier, now 

 placed in the genus Ariasa. In 1852 Walker proposed the name 

 Cicada marginalis for Say's species and if this is to be used, the 

 name of the insect under consideration should be Cicada marginalis 



