384 TERTIARY INSECTS OF NORTH AMERICA. 



Tabic of the genera of fossil Myodochina. 



Auterior and posterior lobes »( thorax with independent lateral cirves (Div. Itlyoilocliarin..) 



Miildle femora as long as the width of the body at their insertion 1. Ligijrocoris. 



Middle femora .shorter than the width of the body at their insertion. 

 Anterior lobe of thorax with the sides arcnate. 



Minute species, less than four millimeters in length 2. Stenopamera. 



Larger species, not less than five millimeters in length. 

 Anterior much longer thaa posterior lobe of thorax. 



Antennae no longer than head and thorax ; terminal joint no broader than middle 



of second joint :i. Calopnmern. 



Autenn;e as long as head, thorax, and scutelluin ; lerminal joint incra8.sated. 



4. rhnido]iamern. 



Anterior lobe of thorax a little shorter than the posterior 5. Clioluta. 



Anterior lobe of thorax with the sides obliiine and straight. 

 Anterior and i)osterior lobes of thorax about eiinally long. 



Larger forms. Antennie more than half as long as body ; head as broad as middle of 



thorax; abdomen laterally expanded 6. Lilliocoris. 



Smaller forms.- Antenn;B only half as long as body; head much narrower than mid- 

 dle of thorax ; abdomen not laterally expanded 7. Cojjliocurin. 



Posterior lobe of thorax distinctly shorter than anterior. 



Posterior margin of thorax angulate, the posterior lobe t^^ ice as long in the miildle as 



at sides. (^. Eucorltes. 



Posterior margin of thorax truncate, the posterior lobe of equal lejgth throughout. 

 Antennie as long as head and thorax together, or longer; head longer that 



broad 9. I'rocoris. 



AntenruB shorter than head and thorax together; bead brcader than long. 



10. Clerracoris. 

 Antirior anil posterior lobes of thorax distinguishable only, ifatall, by the transverse impressed line 



of the upper surface ^Div. Rhyparocliroiliaria.) 



Eyes small, globular; head not broailer than front of thorax. 



Minute species, usually lees than 4°'"^ (in one instance as much as 4.5""") in length. 

 Autennte only as long as head and thorax together. 



Anterior liorderof thorax very much shorter than the posterior ; or, if not, much longer 

 than the length of the thorax. 

 Corium of hemlytra reaching only the middle of the abdomen ...11. Trapczonotiis. 

 Corium of henielytra reaching distinctly beyond the middle of the abdomen. 



1"2. Linnna. 

 Anterior border of thorax but little shorter than the posterior and of the s.nne length 



as the tliorax V^. Ilhiipaiocliromns. 



■Antenme fully half as long as body. 



Second joiut of antennae scarcely longer than third or fourth 14. I'uchi/merus. 



Secondjoint ofantenu:e much longer than either of the succeeding .1."). Tiromerus. 



Larger species, usually more than .'i'"'" (in one instance as little .as 4.7""") in length. 



Antenn;o nearly or quite half as long as the body, the last joint scarcely or not incra.ssated. 



l(i. Lilhochromus. 

 Auteun:B not or scarcely longer thau head and thorax together, the last joint usually a 

 little incrassated. 

 Second joint of antennje longest. 



Thorax considerably less than twice .as broad as long 17. diplovhromus. 



Thorax much more than twice as broad as long 18. Prolyga'iis. 



Last joint of autennic longest. 



Eyes at base of head; thorax punctate ; sides of abdomen expanded, usually beyond 



the closed henielytra - 19. Ntcrochromns. 



Eyes iu middle of head ; thorax smooth ; sides of ab lotnen not expandetl Literally 



beyond the hemelytra 20. Exitclus. 



Eyes large, lenticular, half as long as the thorax ; head considerably broader than the front of the 

 thorax 21. Cri/ptochromiia 



