LAWSON: KANSAS CICADID^E. 



319 



Genitalia: Supra-anal plate of male with a strong median process 

 which exceeds the rounded lateral angles. Uncus, when viewed laterally, 

 is stout, straight, and parallel-margined till near the apex, when the 

 caudal margin suddenly tapers to the acute apex. Viewed caudally it 

 is a large sclerite, over one-half longer than wide, with a broadly round- 

 ing, nearly truncate, subapically depressed apex, and with a large trian- 

 gular depression on the dorsal part of its caudal aspect. The ventral piece 

 is strongly V-shaped, with the arms rather slender when viewed caudally 

 but appearing stout from a lateral view. The last ventral segment of 

 the male is twice as wide as long, the lateral margins very slightly sin- 

 uate, the apex broadly rounded. The pygofers of the female have a 

 slender and acute median process which greatly exceeds the lateral angles. 

 Last ventral segment of the female with a broad, distinctly angulate 

 notch reaching nearly half way to the base. In the specimen examined 

 the lateral pieces of the ovipositor each bore about a dozen ridges or 

 teeth, of which the first four were ridge-like and the rest more tooth-like. 



Distribution: This is one of our commonest species. In 

 and around Lawrence it is by far the commonest form. As 

 shown by the following map it is decidedly eastern in its dis- 

 tribution in the state. The record from Riley county is that 

 of the Kansas State Agricultural College. Van Duzee records 

 it from the following other states: Pennsylvania, Indiana, 

 Missouri, Nebraska and Texas. Davis says its distribution is 

 that of the general region of the valley of the Mississippi. 



Remarks: Davis speaks of the song of this species as fol- 

 lows : "The song of pruinosa is quite unlike that of any of the 

 other large native cicadas, and may be rendered as z-zape, 

 z-zape, z-zape. The insect often remains quiet all day, singing 

 from about 3 or 4 p. m. until dark." 



