289 

 Head narrower than pronotuni; sides of the clypeus keel- 

 ed; last segment of rostrmn elongate; pronotivm angulately 

 emarginate at t'he base; tegmina internally widened beyond 



the clavus; first segment of posterior tarsi elongate 



Achilida Stal. 



Head narrower than proncjtum; sides of tlie clypetis not 

 carinate or with an obtnse keel; pronotum most usually 

 angulately emarginate at the l)ase, very rarel\- roundK- sin- 

 uate, tricarinate, lateral keels diverging, most often reach- 

 ing the base ; commissure straight or rounded after the 

 clavus. costa sometimes dilated, costal membrane trans- 

 verselx- yeined; first segment of ])Osterior tarsi elongate. . . 



Tropiduchida Stal. 



Head most often narrower than the ])ronotum; sides of the 

 clypeus sometimes carinate; rostruni with the last segmeiit 

 s'hort or very .short; pronotum posteriorly angulately 

 emarginate. not keeled or with one ol^solescent one; costa 

 simple; posterior tibiae most often unarmed, rarely s\)\- 

 nose; first segment of posterior tarsi elongsite .Dvrbida Stal. 

 Head narrower than pronotum. sides of clypeus keeled; 

 rostrum short, thick, last segment very short; pronotum 

 truncate basally, disk carinate or tuberculate; first seg- 

 ment of posterior tarsi strong, less long. .LophopJiida Stal. 

 Head not or little narrower than pronotum ; clypeus most 

 often convex, lateral margins ver\- rareh- with a keel, pro- 

 notum truncate basally. rarely widely roundly sinuate, 

 without a median keel or with an obsolescent one; scutel- 

 lum short, rarely twice as long as the ]:)ronotum; tegmina 

 coriaceous or subcorneous, rarely vitreous, ver_\- rarely flat, 

 more or less convex, sometimes very much abbreviated; 

 first segment of posterior tarsi short or mediocre, very 



rarely elongate Issida Stal. 



Head wide or very wide, sonielimes st)mew'hat narrower 

 than the pronotum; sides of the pronotum most often lack- 

 ing a 'keel; pronotum posteriorly roundly sinuate, lacking- 

 keels or with an obsolescent median one ; scutellurn very 

 large, costa dilated, costal membrane transversely veined 

 or reticulate; posterior tibiae spinose; first segment of pos- 

 terior tarsi short or rat'her short Ricaiiiida Stal. 



Head a little narro\ver than pronotum; clypeus lacking 

 lateral keels; pronotuni subtruncate at the base or lightly 

 and widely roundlv-sinuate. not keeled or obsolescentlv so; 

 scutellum large, at least three times as long as pronotum: 

 tegmina very greatly dectrmbent; posterior tibiae spineless. 

 Acaiioiilida Stal. 



