23 



Tetig-oniidae. 



Further investigation has convinced me that the subfamihes 

 proposed in my former memoir cannot stand. Search has fail- 

 ed to reveal any sharply limited characters to form subfamilies. 

 There is complete gradation from Tcfigouia to Enrymcla in the 

 position of the ocelli and in the form of the leg spines. Eury- 

 iiicla is remarkably Cercopoid, especially apparently as regards 

 the spines of the hind tibiae, but there is a fundamental differ- 

 ence. 'Die spines in the Cercopidae are apparently solid, direct 

 projections from the leg, and have no value for springing pur- 

 poses, wliile in Enrymcla and other allied forms, in which there 

 are strongly deve'.oped, solid-looking spines, each of these al- 

 ways emits a hollow bristle, which is of value for springing in 

 proportion to its length and to the number on the leg. The 

 bristles in the more typical Tetigoniidae are also hollow and 

 not direct productions of the leo-, but socketed. The differ- 

 ence ])eLween the spines of Tcfigouia and Enrymcla is that in 

 the former, the socket is small, the bristle long; in Enrymcla the 

 socket is large and the bristle short. [PI. XI, figs. 18-20.] 



For convenience, the following tribes based on habitus, arc 

 temporarily retained. I do not feel certain that, compared with 

 tlie divisions of the Fulgoroid families, the Cicadoidea ought 

 not to be divided into 2 families, Cicadidae and Tetigoniidae, 

 the latter forming three subfamilies, Tetigoniinae, Cercopinae 

 and Membrac'nae, but such a question is of minor importance, 

 so long as the relative values of the divisions are understood. 



1 Legs always more or less spinv or strongly bristly. . . .(2) 

 la Legs unarmed or feebly bristly (10) 



2 Ocelli on the dorsal part of the head, distinctly away from 

 its anterior margin (3) 



2a Ocelli (if present) on the margin between vertex and 

 frons; or dorsally, practically contiguous with the margin; or 

 on the ventral side of the head (6) 



3 Spines on the hind tibiae usually feeble except on one 

 Q(]ge where they are strong, with rather short bristles. Stout 

 forms, the head usuallv more or less laminate i Ledrini 



3a Bristles on the hind tibiae strong and long, not spinose. (4) 



4 Exterior discoidal area of tegmen undivided up to the apical 

 cells ; ocelli on the vertex anterior to the apical margin of the 

 eyes 8 Macroceratogoniini 



4a Fxlerior discoidal area divided, so as to form an apical 

 cell (5) 



