IOWA ACADEMY OF SCIENCES. 45 



M. Cephalic j^art of lat- 

 eral margins of pro- 

 notum crenulate, lat- 

 eral angles promi- 

 nent, either rounded 

 or pointed; head, in- 

 cluding eyes, not dis- 

 tinctly wider than 

 long. EuscMstus. 



MM. Lateral margins of 

 pronotum entire, lat- 

 eral angles rounded, 

 not prominent; head, 

 including eyes, dis- 

 tinctly wider than 

 long. Cklorochroa. 

 KK. Frena not extending beyond 

 middle of scutellum. 

 L. Lateral margins of pro- 

 notum with a prominent 

 process slightly bent 

 caudad at lateral angles. 

 Prionosoma. 

 LL. Lateral margins of pro- 

 notum entire, lateral 

 angles rounded. 

 M. Dorsal surface with 

 coarse, black punc- 

 tures, irregularly ar- 

 ranged especially on 

 the pronotum. 



Trichoj)epla. 

 MM. Dorsal surface with 

 finer regularly ar- 

 ranged punctures. 



Carpocoris. 

 II. Sulcus from odoriferous orifices 

 continued laterad in a gradually 

 disappearing wrinkle. 

 J. Juga not longer than tylus. 



Thyanta. 



