March, I9I5-] VaX DUZEE : WeST CoAST ClCADID.^. 23 



In the following keys I have employed so far as possible the 

 characters used by Dr. Distant. The long areole lying along the costa 

 beyond the node I have called the " marginal areole." It is the 

 " first ulnar areole " of Dr. Uhler. The form of the uncus of the 

 male is frequently distinctive and has been used in separating a 

 number of the close species. This uncus is an ovate or oblong piece 

 lying above and partly within the valve. Its main characters have 

 been illustrated by Smith and Grossbeck in the April, 1907, number 

 of Entomological News. 



Tympanal coverings present in the male i 



Tympanal coverings absent in the male Subfam. 3. Tibiciniina. 



I. Tympanal coverings entirely concealing the orifices. . Subfamily i Tibicince. 

 Tympanal coverings inperfect leaving the orifices more or less exposed. 



Subfamily 2. Cicadins. 



Subfamily i. Tibicin.*; (Cic.\din^ of Distant). 



Head including the eyes as wide as or wider than the mesonotum. 



Tibicen Latr. 

 Head including the eyes little more than two thirds the width of the meso- 

 notum Cacaina Dist. 



Genus i. TIBICEN Latr. 



Latreille, Fam. Nat. Regne Anim., p. 426, 1825. 



Type Cicada plebeja Linn. 

 •Opercules triangular, reaching to near the middle of the abdomen. 



I. cinctifera Uhl. 



Opercules broad, rounded at apex, reaching to the base of the first ventral 



segment 2. monteznma Dist. 



Genus 2. CACAMA Dist. 



Distant, Ann. Mag. Nat. Hist., Ser. 7, XIV, p. 429, 1904. 



Type Proarna maiira Dist. 

 Larger (28 mm. to tip of abdomen), elytral venation mostly pale; two ex- 

 terior transverse veins scarcely touched with fuscous ; basal and apical 

 segments of tergum pale, Colo, to Ariz. Not found in California. 



Z'alvata Uhler. 

 Smaller (22 mm. to tip of abdomen) ; elytral venation mostly black, two ex- 

 terior transverse veins broadly black ; basal and apical segments of 

 tergum concolorous black except at outer margins.. 3. crepitans Van D. 



