IOWA ACADEMY OF SCIENCES. 43 



rounded lateral angle; rarely juga longer 

 than tylus or apex of corium broadly rounded, 

 in either case the head only about two-thirds 

 as wide as scutellum. (Tribe Pentatomaria.) 

 F. Segment 2 of venter unarmed, neither 

 spinous nor tuberculate on meson. 

 G. Odoriferous orifices either far laterad 

 of coxse or distinctly elevated or con- 

 tinued in a sulcus; head more com- 

 monly not strongly bent ventrad, lateral 

 margins of juga sometimes narrowly 

 refiexed, reflexed portion never greatly 

 swollen. 

 H. Scutellum with apex broad and 

 rounded, lateral margin scarcely con- 

 cave at any point; head bent strongly 

 ventrad. Cosmopepla. 



HE. Scutellum usually with apex dis- 

 tinctly narrowed and lateral margin 

 concave toward apex; otherwise the 

 head little or only moderately bent 

 ventrad. 

 /. Odoriferous orifices either without 

 a sulcus, or with a sulcus ending 

 suddenly, not continuing into a 

 gradually disappearing wrinkle. 

 J. Veins of membrane irregularly 

 anastomosing or irregularly 

 furcate or ramose. 

 K. Lateral margin of prono- 

 tum entire, unarmed; lateral 

 angle rounded, not at all 

 produced. 

 L. Scutellum broadly 

 rounded at apex, as long 

 or nearly as long as cor- 

 ium; apical margin of 

 corium rounded, apical 

 angle obtuse. Coenus. 

 LL. Scutellum narrowed at 

 apex, not extending so 

 far caudad as corium; 



