NORTH AMERICAN HOMOPTERA. 259 



B. Head not 3-lobed. 



a. Ocelli above a line passing through eyes Pterygia Fairni. 



aa. Ocelli on a line with the eyes. 



6. Prothorax destitute of an anterior process, 

 c. Prothorax much coinpresso-elevated, very high, foliaceous. seen from 

 side, rounded anteriorly, destitute of lateral carina'. 



]VIenibraci$« Fal>r. 

 cc. Prothorax rugose and carinated, not foliaceous; body globular ; tegniina 

 with short, irregular cells; size very small. 



Bolhoiiota Fairni. 

 bb. Prothorax furnished with an anterior process. 



d. Anterior process grooved along middle ; behind lateral angles a lobe, 

 compressed laterally, rounded anteriorly: tegmina with four 



basal, three discoidal ceils IVessorliinuM A. et S. 



dd. Anterior process with carina? on each side at least in anterior part. 

 e. Posterior prothoracic process not reaching apex of tegniina. 

 /. Prothorax strongly compresso-elevated, very high iu front, fre- 

 quently produced in a horn, decreasing in hight backward, 

 furnished with a carina on each side in anterior superior part 

 not extending back of lateral angles, summit foliaceous. 



Kuchopliylliini A. et S. 

 ®. Anterior and posterior part of prothorax strongly dilate-foliace- 

 ous, anteriorly in front of head and below front margin pro- 

 duced rounding downwards; back rounded anteriorly, desti- 

 tute of a process; furnished with a carina on each side. 



Subg. Phillatropis Stal. 



®*'. Anterior part of prothorax with a compressed process, carinate 



on each side, foliaceo-carinate under horn continuously to 



apex Subg. Enchophyllum A. et S. 



***. Anterior part of prothorax i)roduced superiorly in an angle or 

 compressed process carinate on each side, below angle or pro- 

 cess with a carina of variable hight; apex low, very slightly 



elevated Subg. Tropidocera Stal. 



ff. Prothorax at least tri-carinate on back, middle carina sometimes 



strongly foliaceo-elevated, the lateral carinje next to middle 



carina extended at least across middle of posterior process. 



g. Prothorax highly carinate in middle of back, with a compressed 



horn anteriorly, or a compressed angle ; with some abbreviated 



carinte in part turned forward EiK'lioiiopii .\. et S. 



*. Anterior horn of prothorax above and below foliaceo-carinate, 

 with lateral carinaj of horn in middle of sides or near lower 



margin Subg. Enchenopa A. et S. 



**. Anterior horn of prothorax foliaceo-carinate above, a dis- 

 tinct carina below, but not foliaceous, lateral carina' approach- 

 ing nearer superior than lower margin of horn ; apex of head 



truncate, slightly transverse Subg. Campylenchia Stal. 



gg. Prothorax convex anteriorly and unarmed, or projecting in an 

 angle or i)rocess flat above, not compressed. 



TropidoMc.yta Stal. 



TRANS. AM. KNT. SOC. XIX. NUVEMBKK, 1892. 



