HEMIPTERA— HOMOPTERA— CEKOOPID.E. 3 1 5 



This description is based wholly upon the specimen illustrated in Fig. 

 17. That given in Fig. 6 and two others are too imperfect to determine 

 that they certainly belong hero, but they may form a second species of the 

 genus with less strongly curved veins. 



Length of body, 6.75°""; breadth, 3°"°; length of tegmina, 5.5""; 

 breadth, 2"". 



Florissant. Four specimens, Nos. 4625, 4747, 9299, 10479. 



Family CERCOPID^C Leach. 



This was the prevailing type of Homoptera in Tertiary times, at least 

 if the number of individuals be regarded. At Florissant they appear to 

 form three-fourths of the whole bulk. As compared with Fulgorina they 

 were there slightly less numerous in species and genera, but five times as 

 as numerous in individuals. Most of the extinct forms have been referred 

 by authors and especially by Grermar and Heer to the existing genera Cer- 

 copis and Aphrophora, but, as we shall see, these references were so far 

 incorrect that in several instances they belonged to the alternate subfamily 

 and not to that to which they were referred.' So, too, one insect found in 

 the Isle of Wight Tertiary is referred to an existing form, but probably 

 without sufficient reason. As to our own species, some of them are gigantic, 

 nearly all large, and by far the greater part of them allied to types now 

 found only in the tropics of the New World, and yet I have been unable in 

 any instance to refer them to existing genera, though doubtless some of 

 them will be found so referable. The lack of sufficient tropical materials 

 in the museums' of this neighborhood compel the description of several 

 genera as new whicli may prove still extant. 



Subfamily CERCOPIDA St&l. 



The larger part of the fossil Cercopidse that have been described have 

 been referred to this subfamily, but in several instances, as will be pointed 

 out, the reference is incorrect. There remain, however, several species of Cer- 

 copis, a Cercopidium, and a Triecphora (this latter regarded as an existing 



'There is a mistake in Ileer's work on Oeningea insects in tlie references to tlie species of Cercopis 

 on PI. 11. I'he plale is correctly marked, but tlio separate explanation of the plate ami the references 

 in the text give a fignre to C. iingeri which does not exist, and make eleven figures to the plate when 

 there are only ten. The references to C. pallida, oeningensis, fasciata, and rocteliuea, which are re- 

 spectively 8, 9, 10, and 11, should be 7, 8, 9, and 10. 



