Head usually much narrower than the mesonotum; if as wide 

 the pronotum is emarginate behind and tricarinate, 8. 



7. Pronotum truncated behind or at most with a shallow rounded 

 sinus, 6. Issinae 



8. Elytra distinctly ampliated within and overlapping beyond the 



apex of the clavus, 3. Achilinae 



Elytra not ampliated within nor overlapping at apex, 9. 



9. Elytral membrane strongly differentiated from the corium with 



numerous simple longitudinal nervures, 5. Tropiduchinae 



Elytral venation simple, without a distinct closely veined mem- 

 brane; pronotum very short, deep angularly emarginate 

 behind, 9. Derbinae. 



THE SUB FAMILY FULGORINAE SPIN. 



Spinola, Ann. Ent. Soc. Fr., viii, p. 202, 206, 1839 Ful- 

 goridea. 



This subfamily reaches its highest development in 

 numbers and varied forms in the Tropics but we have 

 representatives of five genera in the United States. They 

 contain some of our largest and most curious-looking forms. 



The reticulate anal area of the elytra and in most forms 

 the obliquely truncated apex of the elytra, and the produced 

 vertex will serve to distinguish them. 



The immature stages are all unknown and practically 

 nothing is known of their food plants and life history. 



The only member of the genus Crepusia occurring in 

 North America is Crepusia ylauca, recently described by 

 Metcalf from a male collected at Brownsville, Texas, and 

 Arizona material. 



The following is an adaptation from Metcalf: 



Key to the genera 



1. Head strongly produced anteriorly, the cephalic process nar- 

 rowed towards apex Amycle Stal 



Head not strongly produced anteriorly 2. 



2. Ninth abdominal segment elongate, quinquecarinate 



.. Calyptoproctus Spin. 



Ninth abdominal segment not elongate, not quinquecarinate.. ..3. 



3. Posterior border of pronotum with transverse carina 



Crepusia Metcalf 



Posterior border of pronotum without a transverse carina 4. 



4. Vertex short, with a distinct sulcus between vertex and frons, 

 Poblicia Stal 



... Vertex longer, produced anteriorly Cyrpoptus Stal 



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