338 THE UNIVERSITY SCIENCE BULLETIN. 



These being in the extreme southern part of the state, indicate 

 the southern distribution of this species. This is confirmed by 

 the distribution given by Van Duzee, who records it from the 

 following states: Florida, Louisiana, Indiana, Oklahoma, 

 Texas, and Arizona. Davis reports it from Nebraska also. 



Remarks: Davis quotes Prof. R. W. Harned as stating that 

 this species is found only on low ground or in swampy places. 

 In his article on Mississippi cicadas he makes Cicada erratica 

 a synonym of this species. 



Subfamily CICADIN^ Van D. 



The members of this subfamily do not have the perfect tym- 

 panal coverings possessed by the males of the preceding sub- 

 family, nor are these coverings entirely absent, as in the males 

 of the following subfamily. Our species are medium sized or 

 small forms. 



The two genera of this subfamily represented in the state 

 may be separated by the following key : 



KEY TO GENERA. 



A. Abdomen translucent; cross vein between A; and Ri,-, strongly 

 oblique; tympanal coverings of male large. Cicada. 



AA. Abdomen not translucent; cross vein between R, and Ri,.-, perpen- 

 dicular or very slightly oblique; tympanal coverings of male very 

 small. Proarna. 



Genus Cicada Linn. 



The members of this genus that occur in the United States 

 are rather small forms. They agree with the genus Tibicen in 

 having the tympanal orifices concealed by tympanal coverings, 

 but not perfectly, and yet much better than in the genus Pro- 

 aryia. They also have relatively much smaller heads than do 

 the members of the genus Tihicen. The abdomen is very char- 

 acteristic, being distinctly translucent. The opercula are quite 

 small and are widely separated. They differ also from the 

 genus Proarna by having the cross vein between R., and R^^^ 

 strongly oblique instead of perpendicular, as in the latter. 



A single member of the genus occurs in the state. 



Cicada hieroghjphica Say. 



(I'l. xxiii, fi(;s. 1--: |>1. XXV, fig. 6; p\. xxvi, fiff. TO; pi. .\xvii, fig- -0.) 

 Cicada hieroylyphica Say. .Tl. .Vend. Xnl. Sci. Pliila., vi, p. 'I'Ao, 18aO; Comjil. Writ., 

 ii, p. 371. 



Cicada cliariirlerea Germ.. Tlmii. Eiit. Arrliiv., ii, i). 40, 1830. 



Cicada hiiTdi/li/pliicn Harris, Uej)!. Ins. Mass., p. 170, 1841. 



Tettiyia hieioi/ti/jihica Disl., Hicil. Ccnlr. Am., Honiop., i, p. 11, pi. 3, fig. 2, 1881. 



