March, I9i6.] DaVIS : CiCADAS FROM THE UnITED StATES. 51 



This species resembles somewhat Rihana virgulata Distant, from 

 Mexico, figured in Biol. Centr.-Amer., Rhynch Hom. i, p. 140, but in 

 that insect the opercula are short, and the eyes are more prominent. 

 It resembles still more closely Riliana szvalei Distant, described with- 

 out locality but supposed to come from Central America. The figure 

 in Ann. ^Nlag. Nat. Hist. (7), xiv, p. 427 (1904), shows a more robust- 

 bodied species than castanca with more prominent eyes. There also 

 appears to be differences in color pattern in the head, pronotum and 

 mesonotum. Castanca from its form and character of genitalia, be- 

 longs near to delicata Osb., repcrta Uhler and sordidata Uhler, that is 

 in the genus Cicada as defined by Distant, and not in his genus 

 Rihana. This species in time when more collecting has been done, 

 may prove to be a variety of szvalei, but the name castanca can still 

 apply, especially to the variety with the fore wings entirely suffused 

 with brown, as shown in the female from the Santa Rita Mts., Ari- 

 zona, and included in the description. 



Cicada arizona new species. 



Type male, Santa Rita Mts., Arizona, 5,000 to 8,000 ft., June (F. 

 H. Snow). Davis collection. 



In form resembling Cicada castanca, but smaller with clear wings 

 and short rounded opercula. 



Head black with a greenish yellow spot above the base of each antenna 

 and one each side at posterior margin ; median sulcus on front also greenish 

 yellow. Pronotum greenish yellow with a central longitudinal dark band 

 dilated both anteriorly and posteriorly ; grooves narrowly lined with black ; 

 posterior margin or collar greenish yellow but clouded at the extremities. 

 Mesonotum shining black with two curved lines in the form of parenthesis 

 near the front margin and the cruciform elevation greenish yellow in color. 

 There are two black, depressed dots near the upper extremities of the cruci- 

 form elevation, Tergum dark chestnut colored with the relatively large and 

 protruding tympanal areas slightly lighter in color. Wings clear, with the 

 costal margin yellowish to beyond the middle of the wing and then clouded; 

 the subcostal vein is dark brown. First and second transverse veins clouded. 

 Membranule of the fore wings pinkish at base ; those of the hind wings more 

 gray. Beneath yellowish and more or less pruinose ; black about the eyes 

 and pink on each side of the transverse rugse ; a few black spots near the base 

 of the legs. The opercula are short, do not touch and have the extremities 

 obliquely rounded. The uncus viewed in profile has a relatively large pro- 



