CICADA. 7 
has founded several subgenera, two of which, Cicada and Diceroprocta, are found in 
this fauna, the last appearing to apply to all the species with the exception of the first, 
which is stated by Stl to belong to his subgenus Cicada. In our present imperfect 
knowledge of the family it is impossible to give a correct or even fairly approximate 
estimate of the total number of species even described (for these are frequently wrongly 
ascribed to the genus) or existing unnamed in collections. It is well represented in 
Central America, fourteen species being here included. ; 
3. Opercula long, broad and rounded, covering two thirds of the abdomen. 
1. Cicada opercularis. 
Cicada tibicen, Linn. Syst. Nat. i. p. 707, var. ? 
Cicada opercularis, Oliv. Enc. Méth. v. p. 749. 12, t. iii. £. 1; Germ. in Thon’s Ent. Arch. ii. p. 2. 
45; Stal, Stett. ent. Zeit. xxv. p. 62. 390’. . 
Stoll. Cig. fig. 13. 
Hab. Mexico }. 
This species is here included on the authority of Stal, who considered it a variety 
only of C. tibicen, Linn.; and if this view is correct, the species has a wide Nearctic 
range. Its habits have been studied in Bermuda by Mr. J. H. Jones; and some interesting 
details are given in that author’s ‘The Naturalist in Bermuda,’ p. 122. 
3. Opercula long, triangular, reaching the base of the fourth abdominal segment. 
Apices of the opercula obtuse ; tegmina spotted with fuscous near the apex. 
2. Cicada transversa. (Tab. II. figg.1, 1a, 14.) 
Cicada transversa, Walk. Ins. Saund. Hom. p. 15°. 
Cicada alacris, Stal, Stett. ent. Zeit. xxv. p. 62. 391’. 
Hab. Mexico ?, Vera Cruz 1. 
I am indebted to Dr. Signoret for the opportunity of comparing types of this species 
with those of Walker in the British Museum. 
Apices of opercula acute ; tegmina unspotted. 
8. Cicada ornea. (Tab. III. figg. 3, 3a, 36.) 
Cicada ornea. Walk. List Hom. i. p. 187. 75". 
Hab. Mexico}. 
The type in the collection of the British Museum is here figured. 
3 unknown. 
4, Cicada bicosta, (Tab. III. figg. 1, 1a, 16.) 
Cicada bicosta, Walk. List Hom. i. p. 112. 14. 
Hab. Mexico (Mus. Vind. Ces.); Costa Rica (Mus. Berol.). 
