91 
PLATE X IV. 
ILLUSTRATIONS OF SOME GENERA BELONGING TO THE FAMILY 
CICADIDjE. 
In the later works of Latreille the species of the genus Cicada, 
as restricted by Olivier to the well-known musical species (or the 
Tettigonia of Fabricius), were proposed to be divided into two 
genera, viz., Cicada, in which the musical apparatus of the males is 
concealed by plates ; and Tibicen, in which the first segment of the 
abdomen exhibits on the upper side two slits exposing this apparatus, 
composed of C. lisematodes, Oliv., and some other species. All 
these insects are at once distinguished from the remainder of the 
Linnsean Cicadm by having: three ocelli on the crown of the head, 
and antennae composed of at least six joints. 
Dr. Burmeister, in the volume of his valuable “ Handbucli der 
Entomologie ” treating upon the Linnsean Hemiptera, has not 
adopted the arrangement of Latreille, but unites all the Cicadse into 
one genus distributed into various divisions and subdivisions; to one 
of the latter of which, composed entirely of American species, he 
has applied the name of Tibicen, with the character “Fusse 
zweigliedrig,” whilst C. hsematodes (the true type of Latreille’s 
proposed genus), and other species having the tarsi 3-jointed, he 
has arranged in other divisions. Dr. Burmeister has also described 
a new and most interesting insect, under the name of 
HEMIDICTYA FRONDOSA (Plate 24, fig. 3), 
constituting the passage between the typical Fulgorse and the 
true Cicadse, agreeing with the former in having the hind part of the 
fore wings very much reticulated, and with the latter in having the 
basal portion like parchment, and with very few veins. The species 
is a native of Brazil, the unique specimen in the Royal Museum of 
Berlin having been collected by Langsdorf, in the neighbourhood of 
Rio. The accompanying figure is from a slight sketch made by 
myself, at Berlin, in 1835, from the specimen in question. It is not 
so precise in its details as I could have wished, but is correct in its 
general character. With the exception of this and the species 
described below, we find the veins of the fore wings in all the Cicadse 
thus distributed:—A simple vein is emitted from the place of the stigma, 
beyond which another much shorter, also simple, vein is perceived* 
The mediastinal vein is united with the costa. The postcostal vein is 
