Í2-2 REVISTA CHILENA DE HISTORIA NATURAL 



Subfamily CENTROTINAE 



Key tü Genera 



Pronotum furnished Avith a posterior process (Not 

 recorded in Chile). 



Pronotum destitute of a posterior process aiidofhorns 

 above lateral angles, more or less convex; scutellum 

 acuminate at apex. 



OcgUí nearer to eyes than to each other, placed on a 

 line passing through center of eyes; dorsum of scute- 

 llum with a mediam carina; tegmina with five apical 

 cells, and two discoidal cells, venation regular; front 



of pronotum elévated in a crest usually 



Genus Melizoderes, Blanch. 



ücelli a little nearer to each other than to eyes, dis- 

 tant from base of head; scutellum destitute of a me- 

 dian carina unless at apex; tegmina with numerous 



irregular apical cells, venation unusual 



Genus Aethalion, Lat. 



Genus Melizoderes, Blanch. 



Key to Species 



Dorsum of pronotum convexly arched, front rounded not 



projecting above the head Gayi, Blanch. 



Dorsum of pronotum elévated in front in a crest projec- 

 ting over the head. 

 Summit of crest rounded; tegmina with an oblique 



hyialine band Dohrni, Sign. 



Summit of crest obtusely angular; tegmine destitute of 

 hy aliñe band carinatus, Blanch. 



Genus Aethalion, Latr. 



Key to Species 

 Pronotum and base of tegmina densely punctured, con- 



