20 U.S. NATIONAL MUSEUM BULLETIN 261 



In the five proconiine species studied by Turner and Pollard (1959a), 

 the eggs are laid in clusters, whereas in die single cicadelline species 

 they studied, the eggs were laid singly. Further study is needed to 

 determine whether this character is of tribal significance. 



KEY TO GENERA OF PROGONIINI 



1. Large, robust species, brachypterous, completely covered with 



pubescence; posterior tibiae without macrosetae. 



1. Lojata Strand (p. 25) 

 Without the above combination of characters 2 



2. Forewing at rest not exposing meron of hindleg 3 



Forewing at rest exposing meron of hindleg 37 



3. Apex of head with a very short, blunt projection (fig. 25a) or a 



circular scar (in frontal view) ; species usually white and with a 

 posteriorly directed digitate process (fig. 25b) on posterior mar- 

 gin of proepimeron or dark and with a strongly elevated median 



pronotal keel (fig. 3b) 4 



Apex of head with projection absent, or pronounced if present; 

 species without additional characters set forth above. ... 5 



4. Pronotum with a strongly elevated median keel; proepimeron 



without a posteriorly directed digitate process from hindmargin. 

 2. Proconia Le Peletier and Serville (p. 26) 

 Pronotum not keeled medially; proepimeron with a posteriorly 

 directed digitate process from hindmargin. 



3. DIestostemma Amyot and Serville (p. 30) 



5. Male plates fused almost throughout their length 6 



Male plates fused only basally, or not at all 10 



6. Forewing with an anteapical plexus of veins in corium (fig. 



54m) 7 



Forewing without such a plexus ... 6. Stictoscarta StM (p. 53) 



7. Pronotum with pair of conspicuous conical elevations extending 



dorsally and laterally (fig. 54b). 



10. Zyzzogeton Breddin (p. 67) 

 Pronotum without such elevations 8 



8. Male genital capsule with sclerites on posterior membrane; head 



triangularly produced 7. Yunga JMelichar (p. 57) 



Male genital capsule without such sclerites; head not produced, 

 its anterior margin broadly rounded 9 



9. Forewing without a membrane; male with paraphyses present; 



South American species ... 4. Homoscarta Melichar (p. 46) 



Forewing with a membrane; male without paraphyses; Central 



American species 5. Dictyodisca Schmidt (p. 50) 



