LAWSON: KANSAS CICADID^. 



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." 



