IOWA ACADEMY OF SCIENCES. 41 



DD. Scutellum medium; frena extending to the 

 middle of scutellum. PeriUvs. 



CC. Pre-femora unarmed. 



D. Base of venter distinctly armed with a somewhat 

 prominent spine or acute tubercle extending 

 cephalad. 

 E. Bucculse very slightly elevated, gradually dis- 

 appearing caudad; frena extending distinctly 

 beyond middle of scutellum. Podisus. 



EE. Buccula3 distinctly elevated, not at all thin- 

 ning out caudad, joining at caudal ends; frena 

 extending just to middle of scutellum. Jlineus. 

 DD. Base of second segment of venter unarmed, some- 

 times elevated into a small obtuse tubercle not 

 projecting at all cephalad. 

 E. Segment 2 of rostrum as long as the two api- 

 cal segments together. 

 F. Juga scarcely longer than tylus; body, at 

 least thorax, shiny. Eiitliyrhynclius. 



FF. Juga longer than tylus; body not shiny. 



PJiacognathus. 

 EE. Segment 2 of rostrum shorter than segments 

 8 and 4 together. 

 F. Juga longer than, and meeting in front of, 

 tylus; body not shiny. Dendrocoris. 



FF. Juga scarcely longer than tylus; body 

 shiny. Zlcrona. 



BB. Bucculse parallel, not united caudad; basal segment of 

 rostrum usually slender, rarely very slightly thick- 

 ened. (Sub-family Pentafoinlna\) 

 G. Scutellum large, broad at apex, extending far- 

 ther caudad than corium, usually reaching apex of 

 abdomen; sides of pronotum with a prominent 

 tooth just cephalad of lateral angle. 



(Tribe Podoparia. ) 

 D. Juga longer than tylus, but not contiguous ceph- 

 alad of it; head considerably narrower in front 

 than between eyes; pronotum about one-third 

 longer than head. Podop><. 



DD. Juga contiguous cephalad of tylus; head nearly 

 as broad in front as between eyes, but little 

 shorter than pronotum. Oncozygia. 



