13 
PLATE LI. 
DESCRIPTION OF A GIGANTIC SPECIES OF CICADA, FROM INDIA. 
Dr. Germar, in his excellent memoir upon the species of the 
Genus Cicada, published in the 8th livraison of Silbermann’s “ Revue 
Entoniologique, ’ has arranged them in the following manner:—^ 
1. Fore wings transparent and hyaline. 
A. Scutellum emarginate, sp. 1—3. 
B. Scutellum not cmarginate. 
a. Head broad and short, eyes prominent, sp. 4—38. 
b. Head triangular, eyes simple, sp. 39—47. 
2. Fore-winga coloured, coriaceous opake, sp. 48—53. 
3. Fore-wings coriaceous at base, with a transverse vein which divides them into two halves 
sp. 53—60. 
It will be serviceable to compare Dr. Burmeister’s arrangement, 
given in the second volume of his “ Handbuch der Entomologie,” 
with that of Dr. Germar. It is as follows:— 
1. Fore-wings at the hasc parchment-like, apical portion transparent hyaline* 
a. Prothorax dilated at the sides. (C. stridula, &c.) 
b. Prothorax not dilated, narrower than the head. (C. pbil^mata, &c.) 
2. Fore-wings not horny at the base. 
A. Tarsi 3-jointed. 
1. Lateral margin of pro thorax not dilated into a plate. 
a. Head small, (C. formosa, villosa, rufescens, &c.) 
b. Head large; eyes prominent. (C, orni, &c.) 
2. Lateral margin of protliorax dilated into a plate broader than the broad head. (C 
olivacca Germar.) 
B. Tarsi 2-jointed. 
1. Prothorax with lateral dilatations, (C. tympanum, &c.) 
2, Prothorax not dilated at the sides, narrow, (C. mannifera, &c.) 
The species represented in the accompanying Plate (by far the 
largest of any hitherto known, and now for the first time figured), 
enters into Dr. Germans section 1. B. b., and into that of 2. A. i. a., 
in the arrangement of Dr. Burmeister. The following are its 
characters:— 
