ZAO 
20. (21) Base of abdomen with one or more appendages bearing three 
hemispherodall) (epressionsijy se -talos tale ete ets Achilixiidae 
21. (20) Base of abdomen without lateral appendages. 
22. (23) Tegmina when at rest nearly horizontal or but slightly tecti- 
form. Hind margin beyond clavus generally expanded, and 
when at rest OVverlanpier mveccraessh clei sete neleeiene. olieretoke Achilidae 
bo 
vo 
“-—- 
bo 
bo 
Tegmina when at rest steeply tectiform; hind margin beyond 
clavus not expanded, and do not overlap when at rest. 
24. (25) Tegmen large, tectiform. Hind edge of pronotum slightly roundly 
emarginate; mesonotum large, long. No spines on hind tibiae. 
Acanaloniidae 
25. (24) Tegomina generally smaller. Head as wide, or nearly as wide, as 
8 8 ; Y ’ 
the thorax. Posterior edge of pronotum straight, rarely slightly 
concave; mesonotum short. Hind tibiae with spines. Tegmina 
OMEN MCONTACEOUS! OF SUD COMACeOUSeeme riser ei tee re Issidae 
26. (13) Tegmina with a distinct costal area with transverse veins. 
27. (30) Clavus not granulate. 
5 
28. (29) Head wider than pronotum, seldom a little narrower, sides of 
clypeus often without carinae. Pronotum without carinae or 
with an obscure median carina; mesonotum very large; front 
legs Asimples sys -are kt: aut, s 3.cee eee ono Me ae eee Ricaniidae 
29. (28) Head narrower than pronotum. Sides of clypeus with carinae. 
Pronotum with carinae. Front legs expanded..... Lophopidae. 
30. (27) Clavus granulate. Apex of clavus sometimes bluut and closed, 
sometimes open. Claval veins separate or joined together at 
ER. es agos es eitke steve eyosad ade Cucina cemeenaiets eacie ne clusbpereea cers Flatidae 
I. TETTIGOMETRIDAE. 
Tettigometridae Germar (1821), Magaz, Entom.; type Tettigometra 
Latreille (1804), Hist. Nat. Ins., 12, p. 312. 
From the viewpoint of morphology and the relationship of the 
various fulgorids this family is the most interesting and impor- 
tant, although it is one of the smallest. Its synthetic characters 
make it hard to say whether it should be placed in the Cica- 
doidea or the Fulgoroidea, or whether it should be placed in a 
group by itself. For systematic purposes I have kept it in the 
Fulgoroidea because the majority of its characters indicate that 
to be its correct position. 
Its cicadoidean characters are as follows: The arista of the 
antenna is segmented; the shape of the head is typically cica- 
doidean, the frons reaches from eye to eye without any lateral 
carinae dividing off a small area around the eyes (a continua- 
